How should 1,1-Dichloro-3-methyl-2-butene identity be confirmed?

Use suitable spectroscopic data plus a separating chromatographic method to confirm the carbon skeleton, geminal dichloro group and alkene position. The specification should exclude relevant positional or geometric isomers.

Which impurities should be controlled in 1,1-Dichloro-3-methyl-2-butene?

Agree assay, residual starting materials, positional or geometric isomers, acidity, color and degradation products. Route-specific limits should be set before a sample is tested in the intended reaction.

Can a high GC area percentage alone confirm this dichloroalkene?

No. GC area does not prove the chlorine substitution pattern or distinguish every positional and route-derived impurity. Confirm structure with appropriate NMR or mass-spectral data, then qualify the chromatographic profile in the intended reaction.

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

1,1-Dichloro-3-methyl-2-butene is identified on this page by CAS 85278-91-7 . Its molecular formula is C5H8Cl2 and molecular weight is 139.02 g/mol. The previously displayed CAS 627-38-3 identifies N-propylhydroxylamine, not this chlorinated alkene, and has therefore been removed. 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: Confirm identity, assay method, water or residual solvents, product-specific impurities and physical form against the current COA; no end-use grade is assumed.
Package: State required quantity and destination; confirm the approved container or cylinder, inerting or stabilizer needs, closure or valve, fill quantity, temperature controls and dangerous-goods requirements against the SDS.

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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
Corrected conflict	CAS 627-38-3 belongs to N-propylhydroxylamine, C₃H₉NO, and is not applicable to this product
Key purchase controls	Structural identity, chromatographic assay, positional or geometric 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:
How should 1,1-Dichloro-3-methyl-2-butene identity be confirmed?

A: Use suitable spectroscopic data plus a separating chromatographic method to confirm the carbon skeleton, geminal dichloro group and alkene position. The specification should exclude relevant positional or geometric isomers.
Q:
Which impurities should be controlled in 1,1-Dichloro-3-methyl-2-butene?

A: Agree assay, residual starting materials, positional or geometric isomers, acidity, color and degradation products. Route-specific limits should be set before a sample is tested in the intended reaction.
Q:
Can a high GC area percentage alone confirm this dichloroalkene?

A: No. GC area does not prove the chlorine substitution pattern or distinguish every positional and route-derived impurity. Confirm structure with appropriate NMR or mass-spectral data, then qualify the chromatographic profile in the intended reaction.

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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