{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.ethylmagnesium-bromide","code":"thing-q5404502","url":"https://ver.cy/models/thing/q5404502/","name":"ethylmagnesium bromide","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Ethylmagnesium bromide is an organomagnesium compound of nominal formula C2H5MgBr, used as a Grignard reagent and ordinarily handled in ethereal solution, where solvation and equilibria make its speciation more complex than the formula implies.","purpose":"Enable an agent to identify ethylmagnesium bromide, assess the condition and usable strength of a particular material, and determine its suitability for an intended chemical use.","scope":{"in":["Ethylmagnesium bromide identity and distinction from neighbouring organomagnesium compounds","Solvent, concentration, active reagent assay and impurity profile","Physical state and measured properties under specified conditions","Storage history, integrity and evidence of deterioration","Formulation-specific hazards and chemical-use suitability"],"out":["The general Grignard reagent class and its complete reaction taxonomy","Independent models of ether solvents and magnesium salts","Commercial product catalogues, pricing and procurement workflows","Detailed synthesis, reaction execution and quenching procedures","Laboratory equipment, facility controls and waste-management systems"],"boundaries":[]},"distinguishingFeatures":["Match the identity to CH3CH2MgBr and CAS 925-90-6; these identify the reagent independently of solvent and concentration. [Supplier identity record](https://www.sigmaaldrich.com/US/en/product/aldrich/364673)","Verify an ethyl organomagnesium identity, distinguishing it from methylmagnesium bromide and ethynylmagnesium bromide.","Verify bromide rather than chloride or iodide as the nominal halide component.","Distinguish active organomagnesium reagent from bromoethane, magnesium bromide and spent reaction mixtures.","Distinguish substance identity from formulation: a documented example is 1.0 M in THF, whose liquid state and physical properties belong to that solution. [Supplier formulation record](https://www.sigmaaldrich.com/US/en/product/aldrich/364673)"],"structure":{"bundles":[{"id":"ethylmagnesium-bromide-identity","name":"Ethylmagnesium bromide identity","description":"Establish which chemical identity the registry entry denotes and how physical formulations relate to it.","layers":[{"id":"ethyl-and-bromide-identity","name":"Ethyl and bromide identity","description":"Resolve the organic group and nominal halide independently of packaging.","findings":[{"id":"etmgbr-recognition","name":"EtMgBr recognition","description":"Require evidence that the material is the ethyl bromide member of the organomagnesium reagent family.","questions":[{"text":"Which identity record establishes the ethyl group and bromide component for this material?","id":"etmgbr-recognition-q01","kind":"definition"},{"text":"What distinguishes this record from ethylmagnesium chloride, ethynylmagnesium bromide or bromoethane?","id":"etmgbr-recognition-q02","kind":"boundary"}]}]},{"id":"substance-and-formulation","name":"Substance and formulation","description":"Keep the registry identity distinct from individual solvent products and structural representations.","findings":[{"id":"formulation-boundary","name":"Formulation boundary","description":"Treat the nominal formula as an identity anchor while requiring separate evidence for the material's formulation and actual solution species.","questions":[{"text":"Does the supplied identifier describe ethylmagnesium bromide itself, a solvent formulation or a supplier product?","id":"formulation-boundary-q01","kind":"boundary"},{"text":"What evidence supports any asserted solvation, aggregation or equilibrium composition under the recorded conditions?","id":"formulation-boundary-q02","kind":"provenance"}]}]}]},{"id":"formulation-and-active-strength","name":"Formulation and active strength","description":"Describe what accompanies EtMgBr and how much usable reagent is present.","layers":[{"id":"solvent-and-co-components","name":"Solvent and co-components","description":"Record the carrier and constituents relevant to interpreting the reagent.","findings":[{"id":"composition-evidence","name":"Composition evidence","description":"Identify solvent proportions, deliberate additives and measured impurities without conflating them with the registered substance.","questions":[{"text":"Which solvent or solvent mixture carries the EtMgBr, and on what basis are its proportions stated?","id":"composition-evidence-q01","kind":"measurement"},{"text":"Which residual starting materials, magnesium salts or additives are documented, and by which analyses?","id":"composition-evidence-q02","kind":"provenance"}]}]},{"id":"active-organomagnesium-assay","name":"Active organomagnesium assay","description":"Separate declared concentration from analytically supported reagent strength.","findings":[{"id":"assay-meaning-and-currency","name":"Assay meaning and currency","description":"Require an assay endpoint and sampling history before using a concentration as evidence of available organomagnesium reagent.","questions":[{"text":"Does the reported assay measure active organomagnesium content, total basicity or total magnesium?","id":"assay-meaning-and-currency-q01","kind":"measurement"},{"text":"When was this lot sampled, what concentration and uncertainty were measured, and what has happened to it since?","id":"assay-meaning-and-currency-q02","kind":"provenance"}]}]}]},{"id":"physical-state-and-retention","name":"Physical state and retention","description":"Assess observed condition and the evidence that the material has retained its specified properties.","layers":[{"id":"conditioned-properties","name":"Conditioned properties","description":"Attach physical observations and constants to the material and conditions actually measured.","findings":[{"id":"phase-and-property-attribution","name":"Phase and property attribution","description":"Distinguish solution properties, solvent properties and any substantiated properties of isolated material.","questions":[{"text":"What phase, clarity and solids were observed at the stated temperature and concentration?","id":"phase-and-property-attribution-q01","kind":"measurement"},{"text":"Does each reported density or thermal transition describe this formulation, its solvent or isolated EtMgBr?","id":"phase-and-property-attribution-q02","kind":"boundary"}]}]},{"id":"storage-and-exposure","name":"Storage and exposure","description":"Connect containment and environmental history to current acceptance evidence.","findings":[{"id":"retained-condition-decision","name":"Retained condition decision","description":"Use documented storage limits, exposure events and appropriate assays to decide whether the lot remains usable.","questions":[{"text":"What atmosphere, closure condition, opening history and temperature excursions are documented for this container?","id":"retained-condition-decision-q01","kind":"provenance"},{"text":"Which observed changes or missing records require reassay, quarantine or rejection under the applicable specification?","id":"retained-condition-decision-q02","kind":"action"}]}]}]},{"id":"ethyl-transfer-and-use-suitability","name":"Ethyl transfer and use suitability","description":"Connect the intended chemical role to evidence about this EtMgBr material.","layers":[{"id":"intended-chemical-role","name":"Intended chemical role","description":"Specify the demanded transformation without embedding a synthesis procedure.","findings":[{"id":"ethyl-reagent-role","name":"Ethyl reagent role","description":"Record whether the intended use requires ethyl transfer, basic reactivity or another documented role.","questions":[{"text":"What chemical role must EtMgBr fulfil, and what evidence supports its suitability for that role?","id":"ethyl-reagent-role-q01","kind":"action"},{"text":"Which requirements depend specifically on the ethyl group or bromide formulation and prevent substitution by another Grignard reagent?","id":"ethyl-reagent-role-q02","kind":"boundary"}]}]},{"id":"medium-and-substrate-compatibility","name":"Medium and substrate compatibility","description":"Assess whether the intended environment preserves the desired reagent function.","findings":[{"id":"competing-reactivity-screen","name":"Competing reactivity screen","description":"Require evidence about competing reactions and formulation constraints before declaring the lot fit for use.","questions":[{"text":"Which protic components, electrophilic sites or other reactive constituents could consume EtMgBr or alter the intended outcome?","id":"competing-reactivity-screen-q01","kind":"boundary"},{"text":"What solvent, active-assay and impurity acceptance limits must this lot satisfy for the proposed use?","id":"competing-reactivity-screen-q02","kind":"action"}]}]}]},{"id":"hazards-and-regulatory-identity","name":"Hazards and regulatory identity","description":"Connect the exact EtMgBr formulation to documented safety and regulatory constraints.","layers":[{"id":"formulation-specific-hazards","name":"Formulation-specific hazards","description":"Resolve hazards against the actual solvent, concentration and current safety documentation.","findings":[{"id":"hazard-evidence","name":"Hazard evidence","description":"Require formulation-matched evidence for water reactivity, ignition behaviour, corrosivity and solvent hazards rather than assigning unverified categories.","questions":[{"text":"Which current SDS matches this solvent and concentration, and which hazard categories does it assign?","id":"hazard-evidence-q01","kind":"provenance"},{"text":"What handling, storage and emergency-response constraints follow from that document for the material present?","id":"hazard-evidence-q02","kind":"action"}]}]},{"id":"identifier-and-jurisdiction-mapping","name":"Identifier and jurisdiction mapping","description":"Keep substance identifiers, mixture classifications and local requirements correctly associated.","findings":[{"id":"regulatory-record-resolution","name":"Regulatory record resolution","description":"Validate identifier mappings and establish the jurisdiction and material scope of each regulatory claim.","questions":[{"text":"Which authoritative records verify the EC number and PubChem CID, explicitly distinguishing a CID from a supplier-linked Substance ID?","id":"regulatory-record-resolution-q01","kind":"provenance"},{"text":"Which transport classification and exposure limits apply to this formulation in the intended jurisdiction, and which concern its solvent components?","id":"regulatory-record-resolution-q02","kind":"boundary"}]}]}]},{"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.","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.","questions":[{"text":"Which of these check these first hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-identifiers-q01","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.","questions":[{"text":"Which of these standards and regulation hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","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.","questions":[{"text":"Which of these real-world use hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-measurements-q01","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.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-regional-variation-q01","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.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of ethylmagnesium bromide this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe ethylmagnesium bromide's use as a Grignard reagent in organic synthesis.","Report its flammability and water reactivity from safety data."],"mustNot":["Handle it outside a fume hood or inert atmosphere, or without trained supervision.","Store or ship it without the dangerous goods packaging the rules require.","Dispose of residues without controlled quenching by trained staff."],"requiresHuman":["Approving scale-up or teaching use of the reagent."]},"ethics":{"considerations":["Laboratory fires with ether solutions have hurt many students; supervision is a moral duty."],"affectedParties":["Laboratory staff and students","Firefighters"]},"owners":{"steward":"The laboratory that holds it; the supplier answers for its classification and labelling.","roles":[],"masterSystems":[]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.ethylmagnesium-bromide","Wikidata: Q5404502 (https://www.wikidata.org/wiki/Q5404502)"]},"properties":{"applicability":"required","items":["Chemical identity: Ethylmagnesium bromide; EtMgBr; CH3CH2MgBr; CAS 925-90-6","Solvent composition: Solvent identities and proportions, with stated mass or volume basis","Nominal reagent concentration: mol/L, with reference temperature and supplier or preparation record","Active reagent concentration: mol/L or mmol/g, with assay method, date and uncertainty","Assay selectivity: Active organomagnesium assay; total basicity; total magnesium; other documented endpoint","Impurity and additive profile: Identified species in mass %, mol %, mg/kg or method-specific detection limits","Physical condition: Observed phase, colour, clarity and solids, with temperature and observation date","Conditioned physical properties: Density in g/mL; thermal transitions in °C; pressure in kPa; exact formulation and method","Exposure and containment history: Documented atmosphere, temperature history, opening events and closure integrity; unknown permitted","Applicable hazard classification: Exact formulation SDS, revision date, jurisdiction, GHS categories and transport record"]},"recognition":{"applicability":"required","items":["Usually a grey to brown solution in an ether solvent in a sealed bottle under inert gas.","Labels carry flammable and water-reactive hazard pictograms."]},"capabilities":{"applicability":"required","items":["Resolve EtMgBr names and identifiers to the registered substance while retaining the exact solvent formulation.","Compare nominal concentration with a dated active assay and flag insufficient evidence of usable strength.","Assess a lot against intended-use requirements for solvent, activity and impurities.","Screen a proposed chemical use for ethyl-transfer requirements and incompatible functional groups or media.","Request reassay or quarantine when condition or exposure history falls outside documented acceptance criteria.","Retrieve formulation-specific handling and disposal requirements from the applicable safety documentation."]},"hazards":{"applicability":"required","items":["Ether solvents are highly flammable and can form explosive peroxides.","Reacts violently with water, releasing flammable gas.","Causes severe burns."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations.","Recommendations on the Transport of Dangerous Goods, Model Regulations, United Nations."]},"context":{"applicability":"required","items":["Ethylmagnesium bromide is used in organic synthesis to introduce an ethyl group through carbon-carbon bond formation.","It is commonly encountered as an ethereal solution in research and chemical manufacturing, where solvent composition and active reagent concentration affect its suitability."]}},"sources":[{"title":"Wikidata item Q5404502: ethylmagnesium bromide","url":"https://www.wikidata.org/wiki/Q5404502","note":"identity and sense of the item"},{"title":"Wikipedia: Ethylmagnesium bromide","url":"https://en.wikipedia.org/wiki/Ethylmagnesium_bromide","note":"general description of the item"}],"openQuestions":["Which authoritative records establish the EC number and PubChem CID and reconcile alternative structural representations of ethylmagnesium bromide?","What solvation, aggregation and Schlenk-equilibrium descriptions are supported for the solvent and concentration ranges this model must cover?","Which validated assays distinguish active ethylmagnesium reagent from total basicity and magnesium-containing degradation products?","Which physical constants are established for isolated or specifically solvated EtMgBr, and which commonly reported values describe commercial solutions?","What formulation-specific evidence establishes storage acceptance limits, interpretation of precipitates, hazard categories and applicable occupational exposure limits?"],"resources":{"spec":"/models/things/publications/thing-q5404502/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q5404502/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:32:24Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}