Does 3-Bromo-1-butene CAS 22037-73-6 specify one enantiomer?

No. The carbon bearing bromine is stereogenic, but the product name and CAS number do not define an enantiomeric composition. If stereochemistry matters to the route, specify the required optical form or enantiomeric ratio, chiral method and acceptance criterion instead of using total GC assay alone.

Which controls help distinguish 3-Bromo-1-butene from related C4 bromides?

Use the full name, CAS 22037-73-6 and structural identity data to separate it from 4-bromo-1-butene, crotyl bromide and other C4H7Br isomers. Define GC assay, positional or allylic isomers, alkene by-products, water, acidity or HBr, residual precursors and stabilizer status where applicable.

3-Bromo-1-butene CAS 22037-73-6

3-Bromo-1-butene, CAS 22037-73-6, is an allylic bromide with molecular formula C4H7Br and molecular weight 135.00 g/mol. The C3 carbon bearing bromine is stereogenic; routine commercial material may be racemic unless otherwise specified. It is not 4-bromo-1-butene or crotyl bromide. Buyers should control identity, GC assay, allylic and positional isomers, alkene by-products, acidity or HBr, water, residual precursors, stabilizer and storage history.

CAS: 22037-73-6
Synonyms: 3-Bromo-1-butene, 3-Bromobut-1-ene, 3-Bromo-1-butylene, But-1-en-3-yl bromide
Molecular Formula: C₄H₇Br
Grade: Confirm identity, GC assay, crotyl bromide and other allylic or positional isomers, acidity or HBr, water, residual precursors, stabilizer, color and storage history against the current COA and SDS.
Package: State quantity, destination and receiving method; confirm a compatible moisture-tight container, closure, stabilizer status, fill and headspace, required temperature, transport classification and transfer precautions against the current 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
Product identity	3-Bromo-1-butene; 3-bromobut-1-ene
CAS number	22037-73-6
Formula / molecular weight	C₄H₇Br / 135.00 g/mol
Reaction character	Reactive secondary allylic bromide with possible substitution, rearrangement and elimination
Key purchase controls	Identity, GC assay, allylic and positional isomers, alkene products, acidity or HBr, water, residual precursors, stabilizer and storage history

Applications and grade selection

3-Bromo-1-butene may be evaluated in allylation, substitution and controlled carbon-carbon or carbon-heteroatom bond formation. Nucleophile, solvent, temperature and water can alter direct substitution, allylic rearrangement and elimination.

Use a GC method that separates positional and allylic bromide isomers from alkene by-products.
Set limits for acidity, water, residual precursors, stabilizer and color growth.
Compare regioselectivity, conversion and work-up in the intended reaction before scale-up.

Storage and handling

Keep sealed in compatible packaging at the temperature stated for the exact grade, away from heat, ignition sources, moisture, bases and oxidizers. Record opening date and monitor assay, color and acidity.

Safety, documentation and procurement

Handle as a volatile reactive organobromine intermediate using ventilation, ignition control and suitable personal protection. Procurement should define specification, quantity, package, destination, shipment conditions and documents.

FAQ - Technical & Supply Chain

Q:
Does 3-Bromo-1-butene CAS 22037-73-6 specify one enantiomer?

A: No. The carbon bearing bromine is stereogenic, but the product name and CAS number do not define an enantiomeric composition. If stereochemistry matters to the route, specify the required optical form or enantiomeric ratio, chiral method and acceptance criterion instead of using total GC assay alone.
Q:
Which controls help distinguish 3-Bromo-1-butene from related C4 bromides?

A: Use the full name, CAS 22037-73-6 and structural identity data to separate it from 4-bromo-1-butene, crotyl bromide and other C4H7Br isomers. Define GC assay, positional or allylic isomers, alkene by-products, water, acidity or HBr, residual precursors and stabilizer status where applicable.

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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