{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.dimethylmagnesium","code":"thing-q508920","url":"https://ver.cy/models/thing/q508920/","name":"dimethylmagnesium","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":"Dimethylmagnesium is an organomagnesium compound with stoichiometric formula Mg(CH3)2, whose aggregation and coordination depend on its physical state and solvent environment.","purpose":"Enable an agent to recognise dimethylmagnesium, assess the identity and condition of a particular sample, and determine whether its documented composition and handling constraints support an intended use.","scope":{"in":["Dimethylmagnesium identity and the distinction between nominal Mg(CH3)2 composition and experimentally established species","Solvent, donor coordination, aggregation and coexistence with other magnesium species","Sample grade, active content, halide contamination and degradation","Physical properties tied to material form and measurement conditions","Substance-specific reactivity, compatibility and documented hazard classifications"],"out":["Commercial formulation identity, packaging design and supplier business records","Complete synthesis, purification, transfer or disposal procedures","Methylmagnesium halides and other dialkylmagnesium substances as independent chemical identities","Reaction products, catalyst systems and downstream manufacturing processes","Laboratory equipment, facility controls and emergency-response procedures"],"boundaries":[]},"distinguishingFeatures":["The nominal composition is Mg(CH3)2, or C2H6Mg, with two methyl groups per magnesium; formula alone does not establish aggregation or coordination state.","Methylmagnesium chloride, bromide and iodide have nominal CH3MgX composition and are distinct substances; a mixed sample requires speciation evidence before being described as dimethylmagnesium.","Both organic groups must be methyl groups; ethyl-containing or mixed-alkyl magnesium compounds do not meet this identity.","Magnesium methoxide contains oxygen in its methoxide groups and must not be conflated with dimethylmagnesium.","A donor adduct or solvent solution must identify its additional constituents; its total mass and measured properties cannot automatically be assigned to unsolvated dimethylmagnesium."],"structure":{"bundles":[{"id":"identity-and-boundaries","name":"Identity and substance boundaries","description":"Establish what counts as dimethylmagnesium and how records resolve to this registry entry.","layers":[{"id":"reference-identity","name":"Reference identity","description":"Connect the registered name to traceable chemical identifiers.","findings":[{"id":"formula-and-identifiers","name":"Formula and identifier agreement","description":"PubChem identifies dimethylmagnesium as C2H6Mg, CID 18141, with CAS number 2999-74-8. Identifier evidence should be retained with its source: [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/2999-74-8).","questions":[{"text":"Do the sample name, formula and identifiers resolve to dimethylmagnesium rather than another methyl-containing magnesium compound?","id":"formula-and-identifiers-q01","kind":"definition"},{"text":"Which authoritative records establish each identifier, and are any duplicate or conflicting records unresolved?","id":"formula-and-identifiers-q02","kind":"provenance"}]}]},{"id":"neighbouring-substances","name":"Neighbouring substances","description":"Separate the parent identity from halides, oxygen-containing compounds and formulated materials.","findings":[{"id":"parent-versus-sample","name":"Parent identity versus sample composition","description":"Represent additional solvents, donors and magnesium compounds explicitly instead of silently treating the whole sample as Mg(CH3)2.","questions":[{"text":"Is the record describing dimethylmagnesium itself, a characterised adduct or a mixture containing it?","id":"parent-versus-sample-q01","kind":"boundary"},{"text":"What evidence distinguishes it from methylmagnesium halides, magnesium methoxide and other dialkylmagnesium compounds?","id":"parent-versus-sample-q02","kind":"definition"}]}]}]},{"id":"coordination-and-speciation","name":"Coordination and speciation","description":"Capture the chemical forms present under the sample's actual conditions.","layers":[{"id":"donor-and-aggregation-state","name":"Donor and aggregation state","description":"Record experimentally supported coordination and association assignments.","findings":[{"id":"conditioned-structural-assignment","name":"Conditioned structural assignment","description":"Store structural assignments with solvent, donor, phase and method; leave unmeasured aggregation unresolved.","questions":[{"text":"Which donor ligands and aggregation states are supported by evidence for this particular material?","id":"conditioned-structural-assignment-q01","kind":"measurement"},{"text":"Does the evidence describe the solid, the solution or both, and under what temperature and concentration conditions?","id":"conditioned-structural-assignment-q02","kind":"boundary"}]}]},{"id":"schlenk-related-composition","name":"Schlenk-related composition","description":"Account for coexistence with methylmagnesium halides and magnesium dihalides.","findings":[{"id":"equilibrium-sensitive-identity","name":"Equilibrium-sensitive composition","description":"Methylmagnesium research reports donor- and temperature-dependent Schlenk behaviour involving dimethylmagnesium species; a reagent label alone cannot establish the species distribution. See [experimental coordination and equilibrium study](https://www.sciencedirect.com/science/article/abs/pii/S0022328X04009374).","questions":[{"text":"What measurements constrain the amounts of dimethylmagnesium, methylmagnesium halide and magnesium dihalide?","id":"equilibrium-sensitive-identity-q01","kind":"measurement"},{"text":"Which changes in donor environment, temperature or concentration would require the speciation assignment to be reassessed?","id":"equilibrium-sensitive-identity-q02","kind":"action"}]}]}]},{"id":"assay-and-material-quality","name":"Assay and material quality","description":"Determine how much usable dimethylmagnesium the sample contains and what accompanies it.","layers":[{"id":"active-content","name":"Active content","description":"Make analytical concentration and capacity comparable without conflating their bases.","findings":[{"id":"assay-basis-and-selectivity","name":"Assay basis and selectivity","description":"An assay must state its measured quantity and whether it can distinguish dimethylmagnesium from other reactive species.","questions":[{"text":"Is the reported value total magnesium, dimethylmagnesium formula-unit concentration or reactive methyl equivalents?","id":"assay-basis-and-selectivity-q01","kind":"measurement"},{"text":"What method, uncertainty and selectivity support interpreting that value as dimethylmagnesium content?","id":"assay-basis-and-selectivity-q02","kind":"provenance"}]}]},{"id":"residuals-and-grade","name":"Residuals and grade","description":"Describe constituents that affect the intended use beyond nominal active concentration.","findings":[{"id":"halide-and-donor-burden","name":"Halide and donor burden","description":"Record residual halides, magnesium salts, donors and solvents individually, with detection limits rather than unsupported purity labels.","questions":[{"text":"What are the measured halide-to-magnesium ratio and residual solvent or donor contents?","id":"halide-and-donor-burden-q01","kind":"measurement"},{"text":"Which impurity limits are required by the intended use, and does the batch evidence establish compliance?","id":"halide-and-donor-burden-q02","kind":"action"}]}]}]},{"id":"physical-state-and-integrity","name":"Physical state and integrity","description":"Relate physical observations and reported constants to a defined sample and its history.","layers":[{"id":"form-specific-properties","name":"Form-specific properties","description":"Qualify phase, solubility and thermal observations by composition and conditions.","findings":[{"id":"qualified-property-record","name":"Qualified property record","description":"Require material identity, units, pressure and method for physical constants; distinguish dissolution from chemical change and thermal transitions from decomposition.","questions":[{"text":"Which phase and solubility observations apply to the stated solvent, donor content and temperature?","id":"qualified-property-record-q01","kind":"measurement"},{"text":"Does a reported thermal event represent melting, boiling, donor loss or decomposition, and how was that determined?","id":"qualified-property-record-q02","kind":"measurement"}]}]},{"id":"sample-integrity","name":"Sample integrity","description":"Track whether the currently held material still matches its identity and assay evidence.","findings":[{"id":"history-linked-reassessment","name":"History-linked reassessment","description":"Connect exposure history and physical changes to the need for renewed compositional evidence.","questions":[{"text":"What atmosphere, moisture exposure and temperature history are documented since the last assay?","id":"history-linked-reassessment-q01","kind":"provenance"},{"text":"Do observed precipitation, gas evolution or assay changes require reassessment before the intended use?","id":"history-linked-reassessment-q02","kind":"action"}]}]}]},{"id":"reactivity-and-use-constraints","name":"Reactivity and use constraints","description":"Connect intended chemical function to evidence about compatibility and applicable hazards.","layers":[{"id":"reaction-suitability","name":"Reaction suitability","description":"Assess methyl-transfer capability in the stated substrate and medium context.","findings":[{"id":"contextual-reactive-capacity","name":"Contextual reactive capacity","description":"Keep nominal methyl content separate from demonstrated reaction performance and competing reaction pathways.","questions":[{"text":"What evidence supports the intended methyl-transfer role for this sample's donor, solvent and impurity profile?","id":"contextual-reactive-capacity-q01","kind":"provenance"},{"text":"Which substrate functionalities or medium components could consume reagent or change the intended reaction outcome?","id":"contextual-reactive-capacity-q02","kind":"boundary"}]}]},{"id":"hazard-evidence","name":"Hazard evidence","description":"Associate handling constraints with the exact substance form and jurisdiction.","findings":[{"id":"material-matched-classification","name":"Material-matched classification","description":"Require current evidence for air and moisture sensitivity, ignition behaviour, incompatible substances and regulatory classification without assigning unverified categories.","questions":[{"text":"Which SDS or experimental records establish water reactivity, pyrophoric behaviour and incompatibilities for this material form?","id":"material-matched-classification-q01","kind":"provenance"},{"text":"Which GHS, transport and exposure-limit records apply in the relevant jurisdiction, and do they describe dimethylmagnesium or its formulation?","id":"material-matched-classification-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 dimethylmagnesium this model covers, and on what evidence?","id":"evidence-confidence-notes-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 dimethylmagnesium this model covers, and on what evidence?","id":"evidence-identifiers-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 dimethylmagnesium 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 dimethylmagnesium 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 dimethylmagnesium this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-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 dimethylmagnesium this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe dimethylmagnesium's structure and its role in organometallic chemistry.","Report its air and water reactivity from safety data."],"mustNot":["Handle it outside an 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 experimental work with pyrophoric reagents."]},"ethics":{"considerations":["Pyrophoric reagents have killed and injured students and researchers; training and supervision are 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.dimethylmagnesium","Wikidata: Q508920 (https://www.wikidata.org/wiki/Q508920)"]},"properties":{"applicability":"required","items":["Chemical identity: Dimethylmagnesium; nominal formula Mg(CH3)2 / C2H6Mg; identifiers with source and verification status","Material form: Unsolvated material; characterised donor adduct; solution; suspension; unresolved mixture","Solvent and donor environment: Named solvents and donor ligands, proportions, and donor-to-magnesium molar ratio where established","Magnesium and methyl speciation: Assigned species and fractions, or unresolved; analytical method, temperature and concentration required","Active reagent content: mol/L or mmol/g, explicitly stating whether the basis is Mg(CH3)2 formula units or reactive methyl equivalents","Purity and residual constituents: Mass fraction or molar fraction; halide-to-magnesium ratio; named analytes, detection limits and methods","Physical state and thermal behaviour: Phase; temperature in °C or K; pressure in kPa; transition type and decomposition observation","Condition and exposure history: Documented atmosphere, moisture or air exposure, temperature excursions, observation dates and reassay status","Applicable hazard and regulatory record: Material-matched SDS, jurisdiction, revision date, GHS categories, transport classification and exposure-limit status"]},"recognition":{"applicability":"required","items":["A white solid or a solution in an ether solvent, kept in sealed vessels under inert gas."]},"capabilities":{"applicability":"required","items":["Match a sample label and analytical evidence to the registered dimethylmagnesium identity.","Identify when a nominal dimethylmagnesium sample needs qualification as an adduct, solution or mixed organomagnesium system.","Compare batches using active content, halide burden and donor environment.","Assess whether reported physical properties apply to the sample's form and conditions.","Determine whether evidence supports use as a methyl-transfer reagent in a specified reaction context.","Flag expired, mismatched or incomplete condition and hazard evidence before a handling decision."]},"hazards":{"applicability":"required","items":["Ignites spontaneously in air.","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":["Dimethylmagnesium is encountered in specialist organometallic research and chemical synthesis as a reagent that can transfer methyl groups.","It is also studied to understand magnesium-carbon bonding, aggregation and coordination by solvents.","Its use requires facilities suited to air-sensitive and moisture-sensitive materials, with the actual sample composition documented."]}},"sources":[{"title":"Wikidata item Q508920: dimethylmagnesium","url":"https://www.wikidata.org/wiki/Q508920","note":"identity and sense of the item"},{"title":"Wikipedia: Dimethylmagnesium","url":"https://en.wikipedia.org/wiki/Dimethylmagnesium","note":"general description of the item"}],"openQuestions":["Which authoritative EC or other regulatory identifiers resolve specifically to dimethylmagnesium, and how should potentially duplicate database records be reconciled?","What primary structural evidence establishes the unsolvated solid and the donor-dependent species relevant to the samples being modelled?","Which reliable melting, decomposition, boiling or solubility measurements exist, and exactly which material forms and conditions do they describe?","Which analytical methods distinguish dimethylmagnesium content from total magnesium and other reactive methylmagnesium species with quantified uncertainty?","What current material-specific evidence establishes GHS and transport classifications, exposure-limit status and reassessment criteria after storage or exposure?"],"resources":{"spec":"/models/things/publications/thing-q508920/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q508920/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:12:00Z","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}}