5-Chloro-2-thiophenecarboxylic acid hydrazide

Also known as: 5-Chlorothiophene-2-carboxylic acid hydrazide, 5-Chlorothiophene-2-carbohydrazide, 5-chloro-2-thiophenecarbohydrazide, 5-Chloro-2-thiophenecarboxylic hydrazine, 2-Thiophenecarboxylic acid, 5-chloro-, hydrazide, 5-Chlorothiophene-2-carboxylic acid hydrazide 97%, 5-CHLORO-2-THIOPHENCARBOXYLIC ACID HYDRAZIDE, 5-CHLORO-THIOPHENE-2-CARBOXYLIC ACID HYDRAZIDE, 5-CHLORTHIOPHENE-2-CARBOXYLIC ACID HYDRAZIDE, MFCD01310805

5-Chloro-2-thiophenecarboxylic acid hydrazide (CAS 351983-31-8) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5ClN2OS and a molecular weight of 176.62400 g/mol. Key properties include a melting point of 148-149ºC and a density of 1.491g/cm3. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 351983-31-8
Jingsj CID: J-1110853-5
Molecular Formula: C₅H₅ClN₂OS
Molecular Weight: 176.62400 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	148-149ºC
Density	1.491g/cm3
Exact Mass	175.98100
PSA	83.36000
LogP	2.09620
Refractive Index	1.628

GHS Safety & Compliance

IrritantSignal word: Warning

H302 — Harmful if swallowed
H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-Chloro-2-thiophenecarboxylic acid hydrazide?

The CAS number of 5-Chloro-2-thiophenecarboxylic acid hydrazide is 351983-31-8.

What are the molecular formula and molecular weight of 5-Chloro-2-thiophenecarboxylic acid hydrazide?

5-Chloro-2-thiophenecarboxylic acid hydrazide has molecular formula C5H5ClN2OS and molecular weight 176.62400 g/mol.

Is 5-Chloro-2-thiophenecarboxylic acid hydrazide hazardous?

5-Chloro-2-thiophenecarboxylic acid hydrazide has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.

What are the upstream and downstream products of 5-Chloro-2-thiophenecarboxylic acid hydrazide?

For 5-Chloro-2-thiophenecarboxylic acid hydrazide, Upstream Products: Ethyl 5-chlorothiophene-2-carboxylate, 5-Chlorothiophene-2-carbonyl chloride.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "5-Chloro-2-thiophenecarboxylic acid hydrazide (CAS 351983-31-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1110853-5 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.