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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Ethyl malonyl chloride | CAS 36239-09-5

A malonate-derived acylating reagent with one ethyl ester and one acid chloride, used in heterocycle research where the retained ester and activated carbonyl have different synthetic roles.

CAS36239-09-5
Molecular formulaC5H7ClO3
Molecular weight150.56 g/mol

Product overview

Ethyl malonyl chloride combines two carbonyl-derived functions separated by a methylene: an ethyl ester and an acid chloride. It is neither diethyl malonate nor malonyl dichloride. This asymmetry allows an acylation to introduce an ester-bearing fragment for subsequent chemistry. The identity of both ends matters to procurement, as another ester or acid-chloride pattern changes the building block delivered. The assay should address the intact reactive molecule, while sample preparation must account for its susceptibility to reaction with water and nucleophiles.

Chemical identity

Chemical name
Ethyl malonyl chloride
CAS number
36239-09-5
Molecular formula
C5H7ClO3
Molecular weight
150.56 g/mol

Application context

Published studies of ethyl malonyl chloride with imines report access to beta-lactam carboxylates or dihydro-1,3-oxazin-4-ones, with ring outcome dependent on the reaction system. These are research applications in heterocycle construction. The ester-bearing carbon framework and the acyl chloride-derived reactivity make this a useful input for evaluating such routes. Purchasing criteria should focus on the correct mixed-function structure, intact acylating content and related malonate species. A chloride-based titration may complement identity testing, but does not independently show the complete organic composition or the selectivity achievable in a chosen synthesis.

Chemistry and synthetic role

EtO–C(O)–CH2–C(O)Cl is a malonic acid monoethyl ester acid chloride. Its ester and acyl chloride are chemically distinct.

Quality review

Confirm the mixed-function identity

Verify one ethyl ester and one acid chloride.

Assess reactive content

Define intact reagent assay and how parent monoacid is treated.

Validate sample preparation

Choose an analytical preparation compatible with the acid chloride.

Preparing a specification

State ethyl ester identity, acyl chloride assay, analytical preparation, related malonate species and water-related acceptance criteria.

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 it equivalent to diethyl malonate?

No. Replacing the acid chloride with an ester changes the reactive function.

Does chloride titration give the entire purity profile?

It cannot resolve all organic malonate-related species.

Why specify the assay procedure?

Conversion during preparation can change what is measured and reported.

Technical sources
  1. PubChem CID 118931NCBI / PubChem
  2. Ethyl malonyl chlorideThermo Fisher Scientific
  3. Base-switched annuloselectivity in the reactions of ethyl malonyl chloride and iminesYang et al. / Organic & Biomolecular Chemistry