dimethylmagnesium
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.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 26 questions
Identity and substance boundaries Establish what counts as dimethylmagnesium and how records resolve to this registry entry.
Reference identity
Connect the registered name to traceable chemical identifiers.
Formula and identifier agreement
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).
- Do the sample name, formula and identifiers resolve to dimethylmagnesium rather than another methyl-containing magnesium compound? definition
- Which authoritative records establish each identifier, and are any duplicate or conflicting records unresolved? provenance
Neighbouring substances
Separate the parent identity from halides, oxygen-containing compounds and formulated materials.
Parent identity versus sample composition
Represent additional solvents, donors and magnesium compounds explicitly instead of silently treating the whole sample as Mg(CH3)2.
- Is the record describing dimethylmagnesium itself, a characterised adduct or a mixture containing it? boundary
- What evidence distinguishes it from methylmagnesium halides, magnesium methoxide and other dialkylmagnesium compounds? definition
Coordination and speciation Capture the chemical forms present under the sample's actual conditions.
Donor and aggregation state
Record experimentally supported coordination and association assignments.
Conditioned structural assignment
Store structural assignments with solvent, donor, phase and method; leave unmeasured aggregation unresolved.
- Which donor ligands and aggregation states are supported by evidence for this particular material? measurement
- Does the evidence describe the solid, the solution or both, and under what temperature and concentration conditions? boundary
Schlenk-related composition
Account for coexistence with methylmagnesium halides and magnesium dihalides.
Equilibrium-sensitive composition
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).
- What measurements constrain the amounts of dimethylmagnesium, methylmagnesium halide and magnesium dihalide? measurement
- Which changes in donor environment, temperature or concentration would require the speciation assignment to be reassessed? action
Assay and material quality Determine how much usable dimethylmagnesium the sample contains and what accompanies it.
Active content
Make analytical concentration and capacity comparable without conflating their bases.
Assay basis and selectivity
An assay must state its measured quantity and whether it can distinguish dimethylmagnesium from other reactive species.
- Is the reported value total magnesium, dimethylmagnesium formula-unit concentration or reactive methyl equivalents? measurement
- What method, uncertainty and selectivity support interpreting that value as dimethylmagnesium content? provenance
Residuals and grade
Describe constituents that affect the intended use beyond nominal active concentration.
Halide and donor burden
Record residual halides, magnesium salts, donors and solvents individually, with detection limits rather than unsupported purity labels.
- What are the measured halide-to-magnesium ratio and residual solvent or donor contents? measurement
- Which impurity limits are required by the intended use, and does the batch evidence establish compliance? action
Physical state and integrity Relate physical observations and reported constants to a defined sample and its history.
Form-specific properties
Qualify phase, solubility and thermal observations by composition and conditions.
Qualified property record
Require material identity, units, pressure and method for physical constants; distinguish dissolution from chemical change and thermal transitions from decomposition.
- Which phase and solubility observations apply to the stated solvent, donor content and temperature? measurement
- Does a reported thermal event represent melting, boiling, donor loss or decomposition, and how was that determined? measurement
Sample integrity
Track whether the currently held material still matches its identity and assay evidence.
History-linked reassessment
Connect exposure history and physical changes to the need for renewed compositional evidence.
- What atmosphere, moisture exposure and temperature history are documented since the last assay? provenance
- Do observed precipitation, gas evolution or assay changes require reassessment before the intended use? action
Reactivity and use constraints Connect intended chemical function to evidence about compatibility and applicable hazards.
Reaction suitability
Assess methyl-transfer capability in the stated substrate and medium context.
Contextual reactive capacity
Keep nominal methyl content separate from demonstrated reaction performance and competing reaction pathways.
- What evidence supports the intended methyl-transfer role for this sample's donor, solvent and impurity profile? provenance
- Which substrate functionalities or medium components could consume reagent or change the intended reaction outcome? boundary
Hazard evidence
Associate handling constraints with the exact substance form and jurisdiction.
Material-matched classification
Require current evidence for air and moisture sensitivity, ignition behaviour, incompatible substances and regulatory classification without assigning unverified categories.
- Which SDS or experimental records establish water reactivity, pyrophoric behaviour and incompatibilities for this material form? provenance
- Which GHS, transport and exposure-limit records apply in the relevant jurisdiction, and do they describe dimethylmagnesium or its formulation? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of dimethylmagnesium this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
Dimethylmagnesium is an organomagnesium compound with stoichiometric formula Mg(CH3)2, whose aggregation and coordination depend on its physical state and solvent environment.
In scope
- 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 of scope
- 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
Why it exists Filled
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.
Distinguishing features Filled
- 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.
What robots and AI may and may not do Filled
Must not
- 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.
Only with a human decision
- Approving experimental work with pyrophoric reagents.
May
- Describe dimethylmagnesium's structure and its role in organometallic chemistry.
- Report its air and water reactivity from safety data.
Moral aspects Filled
- Pyrophoric reagents have killed and injured students and researchers; training and supervision are a moral duty.
Who is affected
- Laboratory staff and students
- Firefighters
Owners Filled
Steward
The laboratory that holds it; the supplier answers for its classification and labelling.
Links to other meta-models Filled
parent
- Q11173 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.dimethylmagnesium
- Wikidata: Q508920 (https://www.wikidata.org/wiki/Q508920)
Direct properties required Filled
- 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 required Filled
- A white solid or a solution in an ether solvent, kept in sealed vessels under inert gas.
Capabilities and actions required Filled
- 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 and failure modes required Filled
- Ignites spontaneously in air.
- Reacts violently with water, releasing flammable gas.
- Causes severe burns.
Standards and interfaces required Filled
- Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations.
- Recommendations on the Transport of Dangerous Goods, Model Regulations, United Nations.
Context of use required Filled
- 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 Filled
- Wikidata item Q508920: dimethylmagnesium - identity and sense of the item
- Wikipedia: Dimethylmagnesium - general description of the item
Open questions
- 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?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q508920/spec.json