Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

4-Chlorobutyryl chloride | CAS 4635-59-0

A bifunctional gamma-chloro acylating reagent that introduces a four-carbon unit, retaining a terminal alkyl chloride for subsequent substitution or lactam-building sequences.

CAS4635-59-0
Molecular formulaC4H6Cl2O
Molecular weight140.99 g/mol

Product overview

4-Chlorobutyryl chloride contains two chemically different chlorine sites: an acyl chloride at the carbonyl and a primary alkyl chloride at the opposite end of the chain. This arrangement makes the four-carbon fragment useful when acylation must be followed by another bond-forming event. CAS 4635-59-0 fixes the terminal chlorine position; other chlorobutyryl isomers do not provide the same spacing. For qualification, distinguish intact acyl chloride from the corresponding acid and use an analytical method suited to a reactive acid chloride, including a defined derivatization step if applicable.

Chemical identity

Chemical name
4-Chlorobutyryl chloride
CAS number
4635-59-0
Molecular formula
C4H6Cl2O
Molecular weight
140.99 g/mol

Application context

Published medicinal-chemistry patents use 4-chlorobutyryl chloride to acylate nitrogen-containing intermediates and develop pyrrolidinone-containing structures. The first acylation introduces the carbonyl-bearing chain, while the terminal chloride supplies a site for further transformation. This illustrates why the position and integrity of both functions matter. A route designed around ring formation needs the correct chain length as well as acylating capacity. Buyers should request an impurity profile that can distinguish other chloroacyl species and agree how the assay treats the parent acid or material altered during sample preparation.

Chemistry and synthetic role

ClCH2CH2CH2–C(O)Cl combines a primary alkyl chloride with an acyl chloride; their distinct roles enable sequential chemistry.

Quality review

Check the terminal chlorine position

Verify the 4-chloro isomer and four-carbon chain.

Quantify intact acylating material

Agree an assay that differentiates acid chloride from parent acid or accounts for them appropriately.

Define analytical derivatization

If GC uses an ester derivative, specify preparation and calculation.

Preparing a specification

Include 4-chloro positional identity, intact acyl chloride assay, method or derivatization, parent-acid control and relevant chloroacyl impurities.

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

Are other chlorobutyryl isomers equivalent?

They change the spacing of the reactive functions and the structures accessible downstream.

Does total chlorine establish acylating content?

It cannot distinguish the alkyl chloride from the reactive acyl chloride.

Can two GC results be compared directly?

Only when analyte preparation, separation and reporting basis are compatible.

Technical sources
  1. PubChem CID 78370NCBI / PubChem
  2. 4-Chlorobutyryl chlorideNIST
  3. 4-Chlorobutyryl chlorideThermo Fisher Scientific
  4. Carbamate compounds which inhibit leukocyte adhesion mediated by VLA-4Patent publication