Description

3-Thiophenecarbonyl Chloride, Tetrahydro-5-Oxo- (9Ci) is a high-purity, reactive heterocyclic building block with the CAS number 140914-51-8. This compound is valued for its role as a key acylating agent and intermediate in the synthesis of complex organic molecules. It is primarily needed by research and development chemists and process engineers in the pharmaceutical, agrochemical, and advanced materials sectors for constructing novel molecular architectures.

Application

• Pharmaceutical Intermediate: A critical building block for the synthesis of active pharmaceutical ingredients (APIs), particularly those containing functionalized thiophene or lactam moieties.
• Agrochemical Synthesis: Used in the research and production of novel herbicides, fungicides, and insecticides that require specific heterocyclic scaffolds for bioactivity.
• Organic Synthesis Reagent: Serves as a versatile acyl chloride for introducing the tetrahydro-5-oxo-3-thiophenecarbonyl group into target molecules under standard reaction conditions.
• Material Science Research: Employed in the development of specialty polymers, ligands for catalysis, and organic electronic materials where the thiophene unit is integral.
• Custom Synthesis & Contract Manufacturing: A valuable starting material for custom synthesis projects and scale-up processes in fine chemical production.

Basic Information

Product Name	3-Thiophenecarbonyl Chloride, Tetrahydro-5-Oxo- (9Ci)
CAS No.	140914-51-8
Molecular Formula	C5H5ClO2S
Molecular Weight	164.61 g/mol
Synonyms	5-Oxo-2,3-dihydrothiophene-3-carbonyl chloride; Tetrahydro-5-oxo-3-thiophenecarbonyl chloride; 3-Carbamoyl-2,3-dihydrothiophen-5-one (precursor); 2,3-Dihydro-5-oxothiophene-3-carbonyl chloride; 3-Thiophenecarboxylic acid, tetrahydro-5-oxo-, chloride; 5-Oxotetrahydrothiophene-3-carbonyl chloride
EINECS	Contact for details

Quality Control

Our 3-Thiophenecarbonyl Chloride, Tetrahydro-5-Oxo- (9Ci) is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and IR spectroscopy, to ensure identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its reactivity as an acid chloride and sensitivity to moisture, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent decomposition.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.