3-Chlorobenzo[b]thiophene-2-carbonyl chloride

CAS 21815-91-8C9H4Cl2OSChemical Synthesis

3-Chlorobenzo[b]thiophene-2-carbonyl chloride (CAS: 21815-91-8) is a halogenated heterocyclic organic compound with the molecular formula C9H4Cl2OS and a molecular weight of 231.10 g/mol. This reactive acid chloride serves as a valuable building block in organic synthesis, particularly in the development of complex molecules and pharmaceutical intermediates. Its specific structure allows for diverse chemical transformations, making it a key component in research and development laboratories.

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3-Chlorobenzo[b]thiophene-2-carbonyl chloride (C9H4Cl2OS) — chemical structure, CAS 21815-91-8; Chemistry, fine chemical supplied by Tech Serve Solutions

BenzothiophenesBuilding BlocksChemical SynthesisHalogenated HeterocyclesHeterocyclic Building Blocks

01 /Applications

Chemical Synthesis Intermediate

Utilised as a reactive intermediate in the synthesis of diverse organic molecules. Its acid chloride functionality readily participates in acylation reactions, enabling the introduction of the benzothiophene-2-carbonyl moiety into various substrates.

Pharmaceutical Research

Serves as a building block for the construction of novel heterocyclic compounds with potential pharmaceutical applications. Its incorporation into molecular frameworks can influence biological activity and drug discovery efforts.

Material Science

Can be employed in the synthesis of specialised organic materials where the benzothiophene core provides unique electronic or structural properties.

02 /Properties

Molecular weight	231.10
Empirical formula	C9H4Cl2OS
Assay	97%
Melting point	112-116 °C

03 /Safety & handling

GHS hazard pictogram: Corrosive (GHS05) — Corrosive

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P280Wear protective gloves, clothing and eye/face protection
P305IF IN EYES
P310Immediately call a POISON CENTER or doctor

Protective equipment	Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges
Transport (UN / ADR)	UN 3261 8 / PGII
Water hazard class (WGK, DE)	3
Hazard codes (EU)	C
Risk statements (R)	34
Safety statements (S)	26-36/37/39-45

Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.

04 /Identifiers & registry

CAS number

21815-91-8

MDL number

MFCD00053069

05 /Quality & supply

Documentation

Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.

Supply & logistics

Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.

06 /Frequently asked questions

What is 3-Chlorobenzo[b]thiophene-2-carbonyl chloride used for?

3-Chlorobenzo[b]thiophene-2-carbonyl chloride is primarily used as a reactive intermediate and building block in organic synthesis, particularly in the development of pharmaceutical intermediates and specialised organic materials.

What are the CAS number and molecular formula?

The CAS number is 21815-91-8 and the molecular formula is C9H4Cl2OS.

What grade and purity does Tech Serve Solutions supply?

Tech Serve Solutions supplies 3-Chlorobenzo[b]thiophene-2-carbonyl chloride with an assay of 97%. We do not represent this product as USP, BP, or EP grade.

How should 3-Chlorobenzo[b]thiophene-2-carbonyl chloride be handled safely?

This compound is classified as Danger (GHS05) and causes severe skin burns and eye damage (H314). Handling requires full protective equipment, including eyeshields, face shields, appropriate gloves, and respiratory protection (e.g., N100, P3 filters). Always consult the Safety Data Sheet before use.

Is this product available for export?

Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including 3-Chlorobenzo[b]thiophene-2-carbonyl chloride.

How can I request a quote or sample?

To request a quote or a sample of 3-Chlorobenzo[b]thiophene-2-carbonyl chloride, please contact our sales team through the website or by calling our office.