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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

5-Bromo-1-pentene | CAS 1119-51-3

A five-carbon chain with a terminal alkene and a remote primary bromide, used in bifunctional building-block chemistry, including a published route to potassium 5-bromopentyltrifluoroborate that retains the bromide handle.

CAS1119-51-3
Molecular formulaC5H9Br
Molecular weight149.03 g/mol

Product overview

The bromide and alkene occupy opposite ends of a five-carbon chain. This places a primary substitution site away from the terminal double bond and gives two distinct points for molecular elaboration. Organic Syntheses documents conversion of the alkene into an organoboron function while retaining the brominated end. Qualification should establish chain length and alkene location, distinguish saturated or isomeric halides where relevant, and define the water content needed by the next transformation.

Chemical identity

Chemical name
5-Bromo-1-pentene
CAS number
1119-51-3
Molecular formula
C5H9Br
Molecular weight
149.03 g/mol

Application context

The checked preparation of potassium 5-bromopentyltrifluoroborate illustrates how the terminal alkene can be transformed while preserving a separate bromide for further chemistry. This makes 5-bromo-1-pentene useful for evaluating bifunctional chain-extension strategies. The desired outcome depends on maintaining both the starting chain identity and the correct unsaturation. Buyers should request a component-resolved assay and identify the related haloalkenes that their method must separate. If the next step uses a moisture-sensitive reagent, water should be specified separately from the GC area percentage.

Chemistry and synthetic role

BrCH2CH2CH2CH=CH2 combines a primary alkyl bromide with a nonconjugated terminal alkene.

Quality review

Confirm five-carbon connectivity

Use identification that establishes chain length and terminal unsaturation.

Separate alkene isomers

Agree GC resolution for relevant haloalkene and saturated-halide components.

Set water for the next reagent

Use a separate water criterion where organometallic chemistry requires it.

Preparing a specification

Specify 5-bromo-1-pentene, terminal-alkene identity, GC assay and relevant haloalkene impurities; add water according to the downstream reagent system.

Packaging and storage

Packaging and net weight are agreed for the selected grade, order quantity and destination. Check the actual supplier SDS and label for storage and transport requirements.

Documentation

Request a batch COA, SDS and the analytical methods for the acceptance criteria below. Confirm which supporting chromatograms and identity data are available from the selected manufacturer.

Procurement questions

Is this an allylic bromide?

No. The brominated carbon is separated from the alkene by two methylene groups.

Does this terminal alkene have E/Z forms?

The CH2 end means E/Z notation does not apply.

Can assay alone qualify hydroboration input?

Identity, impurity profile and the chosen process requirements must also be checked.

Technical sources
  1. PubChem CID 70704NCBI / PubChem
  2. 5-Bromo-1-penteneFisher Scientific
  3. Synthesis of Potassium 5-BromopentyltrifluoroborateOrganic Syntheses