{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T09:10:01Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 23.5, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a094e0-63df-7700-a0b5-171cc2b5448a\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: difluoroacetic acid\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 043: ", "usd": 0.0, "recall": true }, "codex": { "seconds": 73.5, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a094e0-63e4-7553-b607-ac2f5baa5fa0\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: difluoroacetic acid\nRegistry id: vr.tr.difluoroacetic-acid\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this " } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:51:39+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "standards_and_regulation", "visual_identification" ] }, "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T10:10:26+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q15126139", "registryId": "vr.tr.difluoroacetic-acid", "name": "difluoroacetic acid", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q15126139/", "model": { "registry_id": "vr.tr.difluoroacetic-acid", "name": "difluoroacetic acid", "purpose": "Enable an agent to recognise difluoroacetic acid, assess the identity and condition of a material containing it, and determine whether evidence supports its intended handling or use.", "definition": "Difluoroacetic acid is the fluorinated monocarboxylic acid CHF2COOH, structurally derived from acetic acid by replacing two hydrogen atoms on its methyl group with fluorine.", "scope_statement": "This model owns the substance identity, material quality, condition-dependent properties, chemical behaviour and action constraints of difluoroacetic acid under vr.tr.difluoroacetic-acid in PHY / PHY.MAT.", "in_scope": [ "Molecular identity and identifiers of the neutral free acid", "Assay, water content, impurities and grade of material samples", "Physical properties with measurement conditions and uncertainty", "Acid-base speciation and relationships to difluoroacetate salts and derivatives", "Evidence supporting chemical uses, handling, storage and disposal decisions" ], "out_of_scope": [ "Independent models of difluoroacetate salts, esters and other derivatives", "Commercial packaging, pricing and supplier operations", "Detailed synthesis procedures and production equipment", "Complete models of formulations containing difluoroacetic acid", "Facility safety programmes and clinical treatment protocols" ], "distinguishing_features": [ "Require the connectivity CHF2-C(=O)OH: two fluorines and one hydrogen occupy the carbon adjacent to the carboxyl group. Identity reference: [Sigma-Aldrich](https://www.sigmaaldrich.com/US/en/product/aldrich/142859).", "Distinguish the two-fluorine structure from monofluoroacetic acid and trifluoroacetic acid; shared naming fragments do not establish equivalence.", "Require the free carboxylic acid identity when distinguishing it from a difluoroacetate anion, salt or ester.", "Cross-check CAS 381-73-7 and EC 206-839-0 against the structure, rather than accepting the abbreviation DFA alone. Identifier reference: [Sigma-Aldrich](https://www.sigmaaldrich.com/US/en/product/aldrich/142859)." ], "characteristics": [ { "name": "Molecular identity", "kind": "category", "unit_or_values": "CHF2COOH; molecular formula C2H2F2O2; structure identifier with provenance", "why_it_matters": "Separates the registered acid from neighbouring fluorinated acids and derivatives." }, { "name": "Substance identifier mapping", "kind": "relation", "unit_or_values": "Registry id, CAS number, EC number and verified PubChem CID", "why_it_matters": "Connects records while keeping PubChem substance records distinct from compound records." }, { "name": "Acid assay", "kind": "measurement", "unit_or_values": "% by mass or explicitly identified analytical basis; method and uncertainty", "why_it_matters": "Controls usable acid quantity; chromatographic area percentage must not silently become mass purity." }, { "name": "Water and impurity profile", "kind": "measurement", "unit_or_values": "Water in % by mass; specified impurities in mg/kg or % by mass; detection limits", "why_it_matters": "Determines whether a sample meets the requirements of moisture-sensitive or impurity-sensitive uses." }, { "name": "Material form and phase", "kind": "state", "unit_or_values": "Neat acid or specified solution; solid, liquid or multiphase; temperature and pressure", "why_it_matters": "Distinguishes substance identity from its current preparation and physical condition." }, { "name": "Thermophysical properties", "kind": "measurement", "unit_or_values": "Melting and boiling temperatures in °C; pressure in kPa; density in g/mL at specified temperature", "why_it_matters": "Supports phase assessment and mass-volume conversion using conditions appropriate to the sample." }, { "name": "Acid-base condition", "kind": "measurement", "unit_or_values": "pKa with solvent, temperature and method; solution pH with concentration and measurement conditions", "why_it_matters": "Supports speciation assessment without treating pH as an intrinsic property of the neat substance." }, { "name": "Grade and intended-use qualification", "kind": "category", "unit_or_values": "Supplier grade; declared specification; qualified, unqualified or unresolved for a stated use", "why_it_matters": "A grade label alone does not establish suitability for every reaction or analytical method." }, { "name": "Hazard and regulatory status", "kind": "category", "unit_or_values": "Source-specific GHS classification, exposure limits and regulatory entries with jurisdiction and revision date", "why_it_matters": "Makes handling decisions depend on applicable evidence rather than analogy with another fluorinated acid." } ], "affordances": [ "Match a label or analytical record to the difluoroacetic acid identity and flag conflicting identifiers.", "Compare a lot's assay, water and impurity results against an intended-use specification.", "Calculate available acid amount from measured quantity and an appropriately defined assay.", "Assess whether observed phase and physical properties are consistent with documented conditions.", "Evaluate suitability for a documented acid or fluorinated-reagent role using reaction-specific evidence.", "Gate handling, storage and disposal decisions on applicable safety documentation and unresolved conditions." ], "agent_conduct": { "may": [ "Report hazard classification, storage and handling rules from a safety data sheet.", "Describe its uses, such as in chromatography and synthesis, from published sources.", "Track stock in a laboratory the agent is authorized to manage." ], "must_not": [ "Give handling advice that contradicts the safety data sheet.", "Help anyone use it to harm people.", "Pour it into drains or dispose of it as ordinary waste.", "Confuse it with trifluoroacetic acid or other fluorinated acids in orders or records." ], "requires_human": [ "Responding to a spill or exposure, which must follow the site's emergency plan." ] }, "ethics": { "considerations": [ "Strong fluorinated acids injure workers who handle them carelessly.", "Fluorinated compounds can persist in the environment." ], "affected_parties": [ "Laboratory workers", "Waste handlers", "Water and soil ecosystems" ] }, "owners": { "steward": "The laboratory or plant that holds it.", "master_systems": [ "Chemical inventories and safety data sheet systems" ] }, "visual_identification": [ "A colourless liquid with a sharp acidic smell, supplied in labelled chemical bottles with corrosive pictograms." ], "failure_modes_and_hazards": [ "Causes severe burns to skin and eyes.", "Vapours irritate the airways." ], "standards_and_regulation": [ "Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations." ], "what_it_is_for": [ "Difluoroacetic acid is encountered in chemical research and specialty chemical synthesis as a fluorinated carboxylic acid.", "It serves as a starting material or reagent for preparing compounds containing difluorinated structural units." ] }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q15126139: difluoroacetic acid", "url": "https://www.wikidata.org/wiki/Q15126139", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: Difluoroacetic acid", "url": "https://en.wikipedia.org/wiki/Difluoroacetic_acid", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "acid-identity-and-boundaries", "name": "Acid identity and boundaries", "description": "Establish which molecular entity the registry entry denotes and where adjacent chemical identities begin.", "rationale": "Confusing fluorination level or free acid with a derivative changes both chemical interpretation and permitted use.", "layers": [ { "id": "molecular-recognition", "name": "Molecular recognition", "description": "Recognise the difluorinated acetic acid structure independently of shorthand names.", "findings": [ { "id": "difluorinated-carbon-test", "name": "Difluorinated carbon test", "description": "Identity evidence must resolve the CHF2 group attached to the carboxylic acid group.", "questions": [ { "text": "Does the supplied structure contain CHF2-C(=O)OH with the intended connectivity?", "kind": "definition", "id": "difluorinated-carbon-test-q01" }, { "text": "What analytical or documentary evidence distinguishes this sample from mono- and trifluoroacetic acid?", "kind": "measurement", "id": "difluorinated-carbon-test-q02" } ] } ] }, { "id": "identifier-and-entity-resolution", "name": "Identifier and entity resolution", "description": "Reconcile external records while preserving the boundary around the neutral acid.", "findings": [ { "id": "free-acid-record-match", "name": "Free-acid record match", "description": "An identifier match must refer to the free acid; salts, esters, mixtures and supplier substance records require explicit relationships.", "questions": [ { "text": "Which authoritative records map the registry entry to CAS, EC and PubChem compound identifiers?", "kind": "provenance", "id": "free-acid-record-match-q01" }, { "text": "Does the referenced material denote the free acid, a difluoroacetate salt, an ester or a solution?", "kind": "boundary", "id": "free-acid-record-match-q02" } ] } ] } ] }, { "id": "acid-content-and-quality", "name": "Acid content and quality", "description": "Describe how much difluoroacetic acid is present and which accompanying constituents affect its use.", "rationale": "Nominal purity cannot establish actual acid quantity or suitability without the assay basis and impurity profile.", "layers": [ { "id": "assay-interpretation", "name": "Assay interpretation", "description": "Separate measured difluoroacetic acid content from nonspecific acidity and supplier grade claims.", "findings": [ { "id": "specific-acid-content", "name": "Specific acid content", "description": "Interpret assay results through their analytical basis; total acidity alone may not distinguish accompanying acids.", "questions": [ { "text": "Is the reported assay mass fraction, chromatographic area fraction or titratable acidity?", "kind": "measurement", "id": "specific-acid-content-q01" }, { "text": "How does the method establish that the reported content belongs specifically to difluoroacetic acid?", "kind": "provenance", "id": "specific-acid-content-q02" } ] } ] }, { "id": "water-and-related-impurities", "name": "Water and related impurities", "description": "Assess water, related acids and other contaminants against a particular use.", "findings": [ { "id": "lot-fitness-evidence", "name": "Lot fitness evidence", "description": "Record measured impurities and detection limits without assuming that plausible contaminants are actually present.", "questions": [ { "text": "What water content and related-acid impurities were measured in this lot, and with what detection limits?", "kind": "measurement", "id": "lot-fitness-evidence-q01" }, { "text": "Which impurity limits must this lot meet for the intended reaction or analytical application?", "kind": "action", "id": "lot-fitness-evidence-q02" } ] } ] } ] }, { "id": "phase-and-solution-state", "name": "Phase and solution state", "description": "Connect observed material condition to temperature, pressure, composition and acid-base environment.", "rationale": "The same chemical identity can have different handling and measurement implications as neat material or in solution.", "layers": [ { "id": "conditioned-physical-properties", "name": "Conditioned physical properties", "description": "Attach conditions and sample composition to thermal and density measurements.", "findings": [ { "id": "phase-consistency", "name": "Phase consistency", "description": "Evaluate observed phase and quantitative properties against evidence appropriate to the actual material.", "questions": [ { "text": "What phase is observed at the recorded temperature, pressure and composition?", "kind": "measurement", "id": "phase-consistency-q01" }, { "text": "Which measured melting point, boiling point and density values apply, and what conditions and uncertainties accompany them?", "kind": "provenance", "id": "phase-consistency-q02" } ] } ] }, { "id": "acid-base-speciation", "name": "Acid-base speciation", "description": "Track the relationship between neutral acid and difluoroacetate in a specified solution.", "findings": [ { "id": "solution-species-balance", "name": "Solution species balance", "description": "Distinguish total analytical difluoroacetate-equivalent content from the amount present as neutral difluoroacetic acid.", "questions": [ { "text": "What solvent, concentration, temperature and pH define the solution being assessed?", "kind": "measurement", "id": "solution-species-balance-q01" }, { "text": "Which validated dissociation data and assumptions support the estimated neutral-acid and anion fractions?", "kind": "provenance", "id": "solution-species-balance-q02" }, { "text": "Does the record describe solution speciation or a separately isolated salt that needs a neighbouring model?", "kind": "boundary", "id": "solution-species-balance-q03" } ] } ] } ] }, { "id": "chemical-role-and-use-fitness", "name": "Chemical role and use fitness", "description": "Connect the substance to evidenced chemical roles and the material requirements of a proposed use.", "rationale": "Possessing the correct molecule does not establish suitability for a particular transformation.", "layers": [ { "id": "documented-reagent-role", "name": "Documented reagent role", "description": "Separate use as an acid from uses involving transformation or transfer of a fluorinated fragment.", "findings": [ { "id": "role-specific-evidence", "name": "Role-specific evidence", "description": "Represent each chemical role through a documented application, including which part of the molecule participates.", "questions": [ { "text": "Is the intended role proton donation, difluoroacetyl-group incorporation or difluoromethyl-group introduction?", "kind": "definition", "id": "role-specific-evidence-q01" }, { "text": "Which primary experimental source demonstrates that role for difluoroacetic acid under relevant conditions?", "kind": "provenance", "id": "role-specific-evidence-q02" } ] } ] }, { "id": "application-qualification", "name": "Application qualification", "description": "Translate a documented use into criteria for accepting a specific material lot.", "findings": [ { "id": "qualified-use-boundary", "name": "Qualified use boundary", "description": "Link material requirements and compatibility evidence to a neighbouring process model rather than embedding a synthesis procedure.", "questions": [ { "text": "What assay, water content and impurity limits does the documented application require?", "kind": "measurement", "id": "qualified-use-boundary-q01" }, { "text": "Does the available evidence qualify this lot for the proposed use, or require additional testing?", "kind": "action", "id": "qualified-use-boundary-q02" } ] } ] } ] }, { "id": "handling-and-regulatory-constraints", "name": "Handling and regulatory constraints", "description": "Associate difluoroacetic acid material with applicable hazard evidence and handling constraints.", "rationale": "Hazards and obligations must be established for the actual acid preparation and jurisdiction, without borrowing classifications from related acids.", "layers": [ { "id": "hazard-evidence", "name": "Hazard evidence", "description": "Resolve classifications, exposure information and evidence gaps for the relevant preparation.", "findings": [ { "id": "applicable-safety-record", "name": "Applicable safety record", "description": "Use the current safety document for the material and jurisdiction; a supplier SDS is an evidence source, not a universal classification. Candidate source: [Sigma-Aldrich SDS](https://www.sigmaaldrich.com/sds/aldrich/142859).", "questions": [ { "text": "Which current SDS and jurisdiction-specific classifications apply to this concentration and grade?", "kind": "provenance", "id": "applicable-safety-record-q01" }, { "text": "Is a substance-specific occupational exposure limit established, and how is an absent limit distinguished from an unresearched one?", "kind": "boundary", "id": "applicable-safety-record-q02" }, { "text": "Which documented controls are required before the proposed handling operation can proceed?", "kind": "action", "id": "applicable-safety-record-q03" } ] } ] }, { "id": "storage-transfer-and-disposition", "name": "Storage, transfer and disposition", "description": "Connect compatibility, material condition and applicable waste or transport requirements to decisions.", "findings": [ { "id": "supported-handling-path", "name": "Supported handling path", "description": "Require evidence for container compatibility, storage conditions and disposition of acid-containing material.", "questions": [ { "text": "Which container materials, incompatible substances and storage conditions are supported by documentation for this preparation?", "kind": "provenance", "id": "supported-handling-path-q01" }, { "text": "Do observed contamination, container damage or undocumented storage require holding the material for review?", "kind": "action", "id": "supported-handling-path-q02" }, { "text": "Which transport and waste requirements apply to the actual composition and jurisdiction?", "kind": "action", "id": "supported-handling-path-q03" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-confidence-notes", "name": "Check these first", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "This description is based on recall; no sources were consulted.", "Verify the CAS number, physical constants, acid dissociation constant and additional registry identifiers before publication.", "Check an authoritative safety data sheet for exact hazard classifications, exposure limits, incompatibilities and transport requirements." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "scheme": "CAS Registry Number", "value_or_pattern": "381-73-7", "note": "Identifies difluoroacetic acid; does not specify purity or solution concentration." }, { "scheme": "Molecular formula", "value_or_pattern": "C2H2F2O2", "note": "Composition of the neutral molecule." }, { "scheme": "IUPAC nomenclature", "value_or_pattern": "2,2-difluoroacetic acid", "note": "Explicitly locates both fluorine substituents on carbon 2." }, { "scheme": "SMILES", "value_or_pattern": "O=C(O)C(F)F", "note": "Structural representation of the neutral acid." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "United Nations Globally Harmonized System of Classification and Labelling of Chemicals (GHS): framework for hazard communication; exact classifications require verification for the supplied material." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Reagent and building block in organic synthesis.", "Introduction of difluoroacetyl groups into organic molecules.", "Preparation of difluoroacetate salts and esters." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "quantity": "Molar mass", "typical_range": "96.03", "unit": "g/mol" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Concentrated material is corrosive and can cause severe skin burns and eye damage.", "Vapour or mist exposure can injure the respiratory tract.", "Neutralization with bases releases heat and can cause splashing if poorly controlled." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-regional-variation", "name": "Regional variation", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "Hazard labels, workplace handling requirements and transport classifications depend on jurisdiction and the concentration and composition supplied." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "name": "Acetic acid", "difference": "Has a CH3 group where difluoroacetic acid has CHF2." }, { "name": "Fluoroacetic acid", "difference": "Has one fluorine substituent on carbon 2 rather than two; its toxicology must not be transferred directly to difluoroacetic acid." }, { "name": "Trifluoroacetic acid", "difference": "Has a CF3 group rather than CHF2." }, { "name": "Difluoroacetate", "difference": "Is the conjugate-base anion CHF2COO− rather than the neutral acid." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of difluoroacetic acid this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "What is the verified PubChem compound CID, distinguished from supplier-linked PubChem substance IDs, and which authoritative identity records corroborate it?", "Which primary measurements establish melting point, pressure-dependent boiling point, density and acid dissociation behaviour with adequate conditions and uncertainty?", "Which validated assays distinguish difluoroacetic acid from water and related fluorinated acids, and what impurity limits are justified for different uses?", "What current jurisdiction-specific hazard classifications, exposure limits, transport entries and environmental obligations apply, including any applicable PFAS definition?", "Which storage compatibility, shelf-life and reaction-specific qualification claims are supported by direct experimental evidence rather than supplier generalities?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 31 } }