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

No. Structural isomers can share a molecular formula. The structure represented by 1,1-dichloro-3-methylbut-2-ene has two methyl groups on the same alkene carbon and therefore no E/Z pair. Use the specified structure and the agreed chromatographic and spectroscopic data to distinguish it from other dichlorinated pentenes.

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

Send us the requested structure or specification, quantity and destination. Include any critical impurity limits or process requirements. We state the analytical method and reporting basis in the supplied quality documentation; GC area percentage should not automatically be treated as a mass-based assay.

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: We specify compatible sealed packaging, net fill and transport conditions for this intermediate in our quotation, based on the quantity and destination.

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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

We can provide COA, TDS, SDS and applicable chromatographic and spectral identity data for the quoted material. Use the handling controls, ventilation and protective equipment specified in the SDS we provide and in your site assessment.

FAQ - Technical & Supply Chain

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

A: No. Structural isomers can share a molecular formula. The structure represented by 1,1-dichloro-3-methylbut-2-ene has two methyl groups on the same alkene carbon and therefore no E/Z pair. Use the specified structure and the agreed chromatographic and spectroscopic data to distinguish it from other dichlorinated pentenes.
Q:
What should be stated when requesting 1,1-Dichloro-3-methyl-2-butene?

A: Send us the requested structure or specification, quantity and destination. Include any critical impurity limits or process requirements. We state the analytical method and reporting basis in the supplied quality documentation; GC area percentage should not automatically be treated as a mass-based assay.

Ordering & Documentation

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

Documents

Tell us which documents your procurement team needs. Before an order, we will check whether the quoted source can provide them for the offered lot.

Quotation

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

Sample & Supply

Ask whether samples, trial quantities or repeat orders are possible. We will check each request against the sourced product and current offer.

Storage & Shipping

Product-specific conditions are confirmed before order.

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