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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2-Bromotoluene | CAS 95-46-5

An ortho-methyl aryl bromide used in carbon–carbon bond-forming research, including Suzuki coupling with phenylboronic acid, where bromine location and separation of bromotoluene isomers define the transferable aromatic fragment.

CAS95-46-5
Molecular formulaC7H7Br
Molecular weight171.03 g/mol

Product overview

Bromine is bonded to the aromatic ring next to methyl, not to the methyl carbon. That distinction separates 2-bromotoluene from benzyl bromide even though both have the same elemental composition. The aryl bromide participates in reported coupling chemistry, carrying the ortho methyl group into the product. Procurement should specify the ring-substituted isomer and review the GC method for relevant bromotoluenes. Water and other process-sensitive impurities should be tied to the catalyst system rather than inferred from the nominal organic assay.

Chemical identity

Chemical name
2-Bromotoluene
CAS number
95-46-5
Molecular formula
C7H7Br
Molecular weight
171.03 g/mol

Application context

Reported Suzuki coupling with phenylboronic acid demonstrates the role of this material as an ortho-tolyl coupling partner. The methyl group remains attached while the carbon bearing bromine becomes the connection site. In catalyst screening or route qualification, small differences in isomer composition can lead to different coupled products. Review chromatographic separation and establish whether water, residual solvent or additional impurity controls are required by the specific process.

Chemistry and synthetic role

An aryl C–Br bond is adjacent to methyl on the benzene ring; there is no benzylic C–Br bond.

Quality review

Locate bromine on the ring

Confirm the aryl bromide rather than benzyl bromide identity.

Separate bromotoluene isomers

Check GC resolution for ortho, meta and para components.

Match catalyst-sensitive controls

Agree water and selected impurity limits for the coupling system.

Preparing a specification

Specify 2-bromotoluene, GC assay with positional resolution, structural identity and any catalyst-specific water or impurity requirements.

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

Why is the molecular formula insufficient?

Benzyl bromide has the same formula but different connectivity.

Does a total bromine test establish ortho purity?

It cannot distinguish the positional isomers.

Should every grade have the same water limit?

Choose a criterion appropriate to the intended catalytic process.

Technical sources
  1. PubChem CID 7236NCBI / PubChem
  2. 2-Bromotoluene A12315Thermo Fisher Scientific
  3. 2-BromotolueneFisher Scientific