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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Bromoacetaldehyde dimethyl acetal | CAS 7252-83-7

A two-carbon electrophile carrying a protected aldehyde, used to attach a dimethoxyethyl unit before later carbonyl chemistry or ring construction, with acetal identity and stabiliser status central to raw-material selection.

CAS7252-83-7
Molecular formulaC4H9BrO2
Molecular weight169.02 g/mol

Product overview

Bromoacetaldehyde dimethyl acetal combines a primary bromomethyl site with an aldehyde protected as its dimethyl acetal. Substitution can attach the two-carbon unit to a nucleophile while preserving the masked carbonyl for a later transformation. Published routes employ this sequence in isoquinoline chemistry and intermediates for dolasetron. The dimethyl acetal identity matters: the corresponding diethyl acetal has different composition and processing characteristics. State the stabiliser requirements in the enquiry and confirm whether the proposed grade contains potassium carbonate. Confirm the actual additive status, chromatographic composition and moisture-related requirements for the material proposed to the selected route.

Chemical identity

Chemical name
Bromoacetaldehyde dimethyl acetal
CAS number
7252-83-7
Molecular formula
C4H9BrO2
Molecular weight
169.02 g/mol

Application context

Patent routes use the bromomethyl end to introduce a protected two-carbon aldehyde fragment. In isoquinoline synthesis, N-alkylation installs an acetal-bearing chain before subsequent ring construction. A separate dolasetron-intermediate route uses it for carbon-chain assembly with a malonate substrate. The shared role is controlled attachment through the C–Br functionality while the aldehyde remains masked. Qualification should address the intact dimethyl acetal and any stabiliser that accompanies it. A stabilised grade may introduce an additional inorganic component into sampling or charging, so additive identity and handling arrangements should be defined with the supplier.

Chemistry and synthetic role

BrCH2CH(OCH3)2 contains a primary alkyl bromide and a dimethyl acetal. The bromide enables substitution; the acetal separates that step from later aldehyde chemistry.

Quality review

Confirm dimethyl acetal

Use identity data that distinguish the dimethyl and diethyl acetals and related haloacetals.

Declare stabiliser status

Ask whether a stabiliser is present and how it is identified and reported.

Review acetal integrity

Agree chromatographic related-substance limits and a suitable water assessment for the intended use.

Preparing a specification

Specify the dimethyl acetal, organic assay, relevant haloacetal impurities, water assessment and stabiliser identity or absence. Clarify sampling if an inorganic additive is present.

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

Can the diethyl acetal use the same specification?

It has a different formula and requires its own assay and process assessment.

Should potassium carbonate be assumed?

Confirm the stabiliser identity and content for the selected grade before ordering.

Why check more than bromine content?

Total bromine does not establish that the intended acetal structure remains intact.

Technical sources
  1. PubChem CID 81672NCBI / PubChem
  2. Bromoacetaldehyde Dimethyl Acetal, stabilized with K2CO3TCI
  3. Intermediate compounds useful to prepare dolasetronEuropean patent EP2060557A1
  4. Process for the preparation of 1-alkylisoquinoline derivativesUS patent US5272270A