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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Ethyl fumaroyl chloride | CAS 26367-48-6

An E-configured fumarate derivative with one activated acid-chloride end and one ethyl ester, used to attach an unsaturated dicarbonyl fragment while retaining the ester for downstream molecular design.

CAS26367-48-6
Molecular formulaC6H7ClO3
Molecular weight162.57 g/mol

Product overview

Ethyl fumaroyl chloride has two different carboxyl-derived termini across a trans alkene. One terminus is an acid chloride for acyl transfer; the other is already an ethyl ester. This distinction separates it from fumaroyl dichloride, diethyl fumarate and monoethyl fumarate. Published synthesis uses the activated end to install a fumarate-containing fragment in a research conjugate. Qualification should address both the E-configured backbone and the retained acid-chloride functionality. A total organic-purity value alone may not describe partially hydrolysed material adequately, so the assay method, free-acid profile and sampling arrangements should be agreed before comparing batches.

Chemical identity

Chemical name
Fumaroyl chloride monoethyl ester
CAS number
26367-48-6
Molecular formula
C6H7ClO3
Molecular weight
162.57 g/mol

Application context

An aspirin–fumarate conjugate synthesis reported in research literature uses ethyl fumaroyl chloride to install the fumarate fragment by acylation. The ethyl ester remains at the opposite end, allowing the molecule to introduce an unsaturated dicarbonyl unit through only one activated terminus. This role is useful when a route needs a defined fumarate fragment rather than a bifunctional diacid chloride. Qualification for such coupling should confirm E geometry and the amount of intact acyl chloride. Hydrolysis-derived monoethyl fumarate and other acid-related components merit a method that distinguishes them from the intended coupling reagent.

Chemistry and synthetic role

EtO2CCH=CHCOCl combines an E alkene, ethyl ester and acid chloride. Acyl substitution at COCl can form an ester or amide while retaining the other ester terminus.

Quality review

Confirm monoester mono-acid-chloride identity

Verify the ethoxy group and the single acid-chloride end.

Check E geometry

Use a structural or chromatographic method appropriate to geometric-isomer assessment.

Assess intact acyl chloride

Agree assay and free-acid testing with sampling that limits unwanted hydrolysis.

Preparing a specification

Specify ethyl fumaroyl chloride with E geometry, intact acyl-chloride assay and relevant free-acid or geometric-isomer limits. Agree sample handling and analysis suited to a moisture-sensitive acyl reagent.

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 fumaroyl dichloride?

No. One end is an ethyl ester rather than a second acid chloride.

Does the formula distinguish fumarate and maleate geometry?

No. Molecular formula does not establish E/Z configuration.

Why measure hydrolysis-related acid?

It changes the amount of active acylating reagent represented by a batch.

Technical sources
  1. PubChem CID 11105675NCBI / PubChem
  2. Ethyl fumaroyl chlorideSigma-Aldrich
  3. Ethyl fumaroyl chlorideChemodex
  4. Synthesis and Characterization of an Aspirin-fumarate ProdrugJoVE primary research protocol