diethyl ether
Enable an agent to identify diethyl ether, assess the condition and suitability of a particular sample, and determine which uses require additional evidence or controls.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to identify diethyl ether, assess the condition and suitability of a particular sample, and determine which uses require additional evidence or controls.
Diethyl ether is the organic compound (C2H5)2O, a symmetrical ether consisting of two ethyl groups bonded to an oxygen atom, occurring as a highly volatile, extremely flammable liquid at ordinary room temperature and atmospheric pressure.
It can be Resolve an ether label to diethyl ether using structural and documentary evidence.; Compare a sample's assay, water and stabilizer content against a stated application specification.; Assess whether physical-property evidence applies at the sample's temperature, pressure and composition.; Flag missing or stale peroxide and storage evidence for qualified assessment.; Identify applicable hazard, exposure and transport records for a specified jurisdiction and material form.; Record a use restriction or referral for specialist disposition when condition evidence is insufficient..
Distinguishing features
Require the connectivity CH3CH2-O-CH2CH3: the oxygen joins two ethyl groups, distinguishing diethyl ether from other ethers.
Use molecular connectivity alongside formula C4H10O; that formula also describes alcohols and other ether isomers.
Distinguish the specific substance from the broad term 'ether', which can denote a chemical class or an ambiguous product label.
Exclude petroleum ether, which names a hydrocarbon mixture rather than diethyl ether.
Separate evidence of diethyl ether as a constituent from evidence that a whole sample qualifies as a stated grade of diethyl ether.
Scope
+ Diethyl ether identity, synonyms, structural identifiers and verified registry cross-references
+ Sample purity, grade, water content, stabilizers and relevant impurities
+ Physical properties with measurement conditions and uncertainty
+ Peroxide formation, storage history and evidence of sample deterioration
+ Hazard classification, exposure criteria and suitability for a stated use
- The ether functional-group class and other individual ether compounds
- Commercial formulations containing diethyl ether as one constituent
- Manufacturing processes and their equipment
- Extraction, reaction and purification procedures as activities
- Clinical anesthesia practice and patient-specific treatment decisions
- Facility ventilation, fire protection and waste-management systems
Characteristics
- Molecular identity
- C4H10O; connectivity CH3CH2-O-CH2CH3; independently verified structural identifiers Distinguishes the substance from structural isomers and materials sold under ambiguous ether names.
- Registry cross-references
- CAS, PubChem CID and EC identifiers linked to a consulted authority Connects scientific, supplier and regulatory records without relying on name matching alone.
- Assay and impurity profile
- Mass fraction or amount fraction with method, detection limits and identified impurities Determines whether a sample satisfies a use-specific specification.
- Water content
- mg/kg or mass percent with method and sampling date An anhydrous designation requires supporting evidence and may cease to describe an opened sample.
- Stabilizer identity and concentration
- Named stabilizer and concentration in mg/kg; absent or unknown only when supported Stabilizers can affect application compatibility and do not replace assessment of peroxide condition.
- Grade and specification
- Supplier or standard-defined grade, specification revision and conformance evidence Grade labels are meaningful only through the requirements and evidence behind them.
- Physical phase
- Solid, liquid, vapor or multiphase at recorded temperature and pressure State affects containment, transfer and interpretation of property measurements.
- Phase-transition properties
- Melting and boiling temperatures in °C or K, with pressure, purity and source Allows comparison of observed behavior with reference material under matching conditions.
- Volatility and density
- Vapor pressure in kPa and liquid density in kg/m³ at specified temperatures Supports assessment of vapor generation and conversion between mass and volume.
- Peroxide condition
- Unknown, assessed or suspect; linked quantitative result with method, units, date and limitations A current assessment is necessary to distinguish measured condition from assumptions based on age or appearance.
- Storage and opening history
- Receipt, opening and assessment dates; documented light, air and temperature exposure Provides context for deterioration and for deciding whether earlier quality evidence still applies.
- Hazard and exposure criteria
- Jurisdiction-specific classifications and exposure limits with units, averaging periods, dates and sources Prevents an agent from treating classifications or numerical limits as universally applicable.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 34 questions.
Diethyl ether identity Establishes the specific molecular substance behind a name, identifier or sample label.
The word ether and the formula C4H10O do not independently establish diethyl ether identity.
Structure and names
Resolves molecular connectivity and ambiguous terminology.
Two ethyl groups linked by oxygen
Recognition requires evidence for the diethyl ether structure rather than formula or an informal ether label alone.
- What structural identifier or analytical evidence establishes CH3CH2-O-CH2CH3? definition
- Does 'ether' in this record mean diethyl ether, petroleum ether or the broader chemical class? boundary
Authoritative identity links
Connects the registry entry to verified substance records.
Identifier agreement
External identifiers must resolve to the same structure and distinguish substance records from supplier products.
- Which consulted records establish the CAS number, PubChem CID and EC number for diethyl ether? provenance
- Does each linked record describe the substance itself or a stabilized product or mixture? boundary
Grade and composition Describes what accompanies diethyl ether in a sample and how its grade is established.
Water, stabilizers and impurities can determine suitability even when molecular identity is correct.
Assay and water
Separates measured composition from grade names and label claims.
Sample-specific purity
Assay and water results need an explicit basis, method and link to the material being assessed.
- What are the diethyl ether assay and water content, and on what measurement basis were they reported? measurement
- Does the evidence describe this sample now, its unopened lot or only a generic supplier specification? provenance
Stabilizers and grade claims
Records additives and the actual requirements behind a commercial grade.
Grade requirements and additive evidence
Anhydrous, stabilized and other grade designations require separate supporting specifications.
- Which stabilizer, if any, is present, at what concentration and according to which evidence? measurement
- Which specification defines the claimed grade, and which requirements remain unverified? definition
- Are the documented water, stabilizer and impurity levels compatible with the intended application? action
Phase and solvent behavior Relates physical state, volatility and solvent behavior to explicit conditions.
Reference properties cannot support decisions reliably when pressure, temperature or sample composition are omitted.
Phase and volatility
Captures condition-dependent phase and vapor-generation evidence.
Physical properties with conditions
Phase, melting point, boiling point and vapor pressure must retain their reference conditions.
- What phase is present at the recorded temperature and pressure? measurement
- Which consulted sources establish melting point, boiling point and vapor pressure, including units and conditions? provenance
Solvent-system interactions
Captures relevant density, solubility and phase behavior without owning an extraction procedure.
Mixture-specific solvent performance
Solvent suitability depends on the solute and other phases, not merely the designation organic solvent.
- What solubility or partition evidence applies to the intended solute and actual mixture composition? measurement
- Which density and mutual-solubility data support identifying phases at the intended temperature? provenance
- Which operational choices belong to a linked extraction or reaction model? boundary
Peroxide condition and history Connects deterioration evidence to storage, opening and subsequent handling decisions.
Diethyl ether's peroxide-forming behavior makes present condition a separate concern from initial purity.
Exposure and stabilization history
Records the history needed to interpret condition evidence.
Traceable aging context
Age, air and light exposure, and stabilizer information provide context without proving current peroxide concentration.
- What receipt, opening and storage-exposure history is documented for this sample? provenance
- What evidence supports the continuing relevance of the original stabilizer and quality declarations? provenance
Condition evidence and use restrictions
Links peroxide assessment to an applicable decision rule.
Peroxide assessment with limitations
A reported peroxide result must retain its method, units, date and limitations; an unknown condition remains unknown.
- What peroxide assessment exists, and what are its reporting basis, detection limits and sample applicability? measurement
- Which authoritative procedure governs referral or restriction before handling or an operation that could concentrate residues? action
- What unresolved history or condition evidence prevents a supported suitability decision? boundary
Hazards and authorized use Connects the material's documented hazards to jurisdiction and intended activity.
Flammability, exposure and transport decisions require applicable evidence rather than an unqualified hazard label.
Hazard and exposure evidence
Records classification and numerical criteria with their governing context.
Applicable hazard record
Classification, ignition-related properties and exposure limits must identify the source, material and jurisdiction.
- Which current classification and safety data sheet apply to this diethyl ether material in the relevant jurisdiction? provenance
- What flash-point and flammable-range data are supported, with methods, units and conditions? measurement
- Which exposure limits apply, with what averaging periods and legal or advisory status? definition
Application and disposition
Uses identity, quality and condition evidence to qualify a proposed use or disposition.
Evidence-backed use decision
Suitability is specific to the application and does not follow from historical use or substance identity alone.
- Which application requirements are satisfied by the sample's grade, composition and current condition evidence? action
- Which transport or waste requirements apply to this material's actual composition and condition? action
- Does the proposed use require a separate clinical, process or facility assessment? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
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.
- This is recall without source consultation; numerical properties are approximate values for the pure substance.
- Verify current jurisdiction-specific hazard classifications, exposure limits and transport provisions before regulatory use.
- Grade names do not establish universal specifications; verify water content, purity, stabilizer identity and peroxide content for the supplied material.
- Which of these check these first hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Technical-grade diethyl ether
- Reagent-grade diethyl ether
- Anhydrous diethyl ether
- Stabilized diethyl ether containing a peroxide-inhibiting additive
- Unstabilized diethyl ether
- Which of these kinds and varieties hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- CAS Registry Number - 60-29-7 - Identifies diethyl ether as a substance, irrespective of commercial grade.
- PubChem CID - 3283 - Compound identifier for diethyl ether.
- EC number - 200-467-2 - European inventory identifier.
- UN dangerous goods number - UN 1155 - Transport identity for diethyl ether (ethyl ether).
- IUPAC nomenclature - Ethoxyethane - Systematic substitutive name.
- Which of these identifiers and schemes hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- United Nations Economic Commission for Europe: Globally Harmonized System of Classification and Labelling of Chemicals provides the hazard classification and communication framework.
- United Nations: Recommendations on the Transport of Dangerous Goods identify diethyl ether as UN 1155, Class 3, packing group I.
- European Union: the CLP Regulation governs substance classification, labelling and packaging.
- United States Occupational Safety and Health Administration: the Hazard Communication Standard governs workplace hazard communication.
- Which of these standards and regulation hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Laboratory solvent for extraction and liquid-liquid partitioning.
- Solvent and coordinating medium for Grignard reagents and other moisture-sensitive organometallic chemistry.
- Ingredient in some engine-starting fluids.
- Historically used as an inhalational general anesthetic.
- Which of these real-world use hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Molar mass - 74.12 - g/mol
- Normal boiling point - Approximately 34.6 at 101.325 kPa - °C
- Melting point - Approximately -116 - °C
- Liquid density - Approximately 0.713 at 20 °C - g/mL
- Flash point - Approximately -45; closed-cup measurement - °C
- Which of these typical measurements hold for the sense of diethyl ether 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.
- Extremely flammable liquid; vapor readily forms ignitable mixtures with air.
- Vapor is heavier than air and can travel to ignition sources, causing flashback.
- Exposure to air during storage can generate explosive peroxides, which may become concentrated during evaporation or distillation.
- Inhalation can cause central nervous system depression, progressing from dizziness and drowsiness to unconsciousness at high exposure.
- High volatility can cause rapid pressure buildup in closed containers when heated.
- Which of these failure modes and hazards hold for the sense of diethyl ether this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Occupational exposure limits and their averaging periods differ between jurisdictions and issuing bodies.
- Required label wording and classifications depend on the jurisdiction's implementation of chemical hazard rules and the supplied formulation.
- Which of these regional variation hold for the sense of diethyl ether 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.
- Ethers - Ethers are the broader R-O-R' compound class; diethyl ether specifically has an ethyl group on each side of the oxygen.
- Dimethyl ether - Has two methyl groups rather than two ethyl groups and is a gas at ordinary room temperature and atmospheric pressure.
- Ethanol - Contains an O-H group and is an alcohol; diethyl ether has a C-O-C linkage and no O-H group.
- Tetrahydrofuran - Is a cyclic ether and is miscible with water; diethyl ether is acyclic and has limited water solubility.
- Engine-starting fluid - Is a formulated product that may contain diethyl ether alongside other ingredients, rather than the pure substance.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of diethyl ether this model covers, and on what evidence? provenance
What the second pass must settle
- Which existing Vercy publication, if any, already owns diethyl ether and should be linked instead of creating another model?
- Which authoritative records establish the registry cross-references and reference physical constants, and how should conflicting measurements be represented?
- Which grade specifications provide defensible limits for water, stabilizers and impurities in the intended applications?
- Which authoritative peroxide-assessment methods and decision rules apply to the intended setting, and how do they address unknown storage history?
- Which jurisdictions and activities must the first researched publication cover for hazard classification, exposure limits, transport and disposition?