Can 1,1-Dichloro-3-methyl-2-butene be identified by molecular formula alone?

No. A molecular formula does not distinguish constitutional or geometric isomers. Match this intermediate by the complete product name, CAS 85278-91-7, structure and agreed GC or spectral identity data, and do not substitute another dichlorinated pentene solely because its formula or molecular weight appears similar.

What should be stated when requesting 1,1-Dichloro-3-methyl-2-butene?

Provide the required GC assay, individual or total isomer limits, water, acidity, appearance and any process-specific impurity limits, together with quantity, packaging and destination. The supplier should identify the actual analytical methods and batch results rather than treating the CAS number as a complete purchase specification.

1,1-Dichloro-3-methyl-2-butene CAS 85278-91-7

1,1-Dichloro-3-methyl-2-butene, also called 1,1-dichloro-3-methylbut-2-ene, CAS 85278-91-7, is a chlorinated alkene with molecular formula C₅H₈Cl₂ and molecular weight 139.02 g/mol. This relatively uncommon intermediate should be purchased against a lot-specific identity, assay, isomer and stability specification rather than unsupported commodity purity, boiling-point or bulk-use claims.

CAS: 85278-91-7
Synonyms: 1,1-Dichloro-3-methyl-2-butene, 1,1-Dichloro-3-methylbut-2-ene, 85278-91-7
Molecular Formula: C₅H₈Cl₂
Grade: Before qualification, require structure-specific identity evidence such as NMR or MS together with a separating chromatographic method, lot assay, isomer profile and stability data; the name/CAS relationship remains document-dependent.
Package: State quantity and destination; confirm the current compatible sealed container, closure, secondary containment, net fill, storage conditions and transport requirements against the SDS before quotation.

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Product Description

1 Identity and physicochemical profile

2 Applications and grade selection

3 Storage and handling

4 Safety, documentation and procurement

Identity and physicochemical profile

Item	Technical guidance
Correct identity	1,1-Dichloro-3-methyl-2-butene; 1,1-dichloro-3-methylbut-2-ene
CAS number	85278-91-7
Formula / molecular weight	C₅H₈Cl₂ / 139.02 g/mol
Key purchase controls	Structural identity, chromatographic assay, constitutional isomers, residual precursors, acidity, color and storage history

Applications and grade selection

1,1-Dichloro-3-methyl-2-butene may be evaluated as a chlorinated-alkene building block in controlled organic synthesis and reaction-development work. Its geminal dichloromethyl and substituted alkene functions require project-specific assessment; broad claims concerning coupling, low toxicity or routine industrial use should not replace analytical and reaction qualification.

Confirm structure with suitable spectroscopic data and distinguish it from positional isomers and compounds carrying similar names.
Agree the assay method and limits for residual precursors, isomers, acidity and degradation products.
Run the intended transformation at small scale before requesting a larger project quantity.

Storage and handling

Keep the material tightly closed in compatible packaging and protect it from heat, light, moisture and incompatible reagents under the conditions stated in the current SDS and COA. Record sampling and storage history during qualification.

Safety, documentation and procurement

Handle as a reactive chlorinated synthesis intermediate using suitable ventilation, gloves and eye protection according to the current SDS and site assessment. An inquiry should define identity methods, impurity limits, quantity, packaging, destination and shipping requirements.

FAQ - Technical & Supply Chain

Q:
Can 1,1-Dichloro-3-methyl-2-butene be identified by molecular formula alone?

A: No. A molecular formula does not distinguish constitutional or geometric isomers. Match this intermediate by the complete product name, CAS 85278-91-7, structure and agreed GC or spectral identity data, and do not substitute another dichlorinated pentene solely because its formula or molecular weight appears similar.
Q:
What should be stated when requesting 1,1-Dichloro-3-methyl-2-butene?

A: Provide the required GC assay, individual or total isomer limits, water, acidity, appearance and any process-specific impurity limits, together with quantity, packaging and destination. The supplier should identify the actual analytical methods and batch results rather than treating the CAS number as a complete purchase specification.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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