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4-O-Methyldopamine hydrochloride

4-甲氧基多巴胺盐酸盐

Also known as: 3-Hydroxy-4-methoxyphenethylamine hydrochloride, 4-Methoxytyramine hydrochloride, Homovanillylamine hydrochloride, 4-(2-Aminoethyl)-2-methoxyphenol hydrochloride, 5-(2-Aminoethyl)-2-methoxyphenol hydrochloride, 4-O-Methyldopamine HCl, MFCD00012896

4-O-Methyldopamine hydrochloride (CAS 645-33-0) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C9H14ClNO2 and a molecular weight of 203.666 g/mol. It is also known as 3-Hydroxy-4-methoxyphenethylamine hydrochloride, 4-Methoxytyramine hydrochloride and Homovanillylamine hydrochloride. Key properties include a melting point of 207-211 °C, a boiling point of 306.8ºC at 760 mmHg and a flash point of 139.3ºC. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
645-33-0
Jingsj CID
J-20692-9
Molecular Formula
C9H14ClNO2
Chinese Name
4-甲氧基多巴胺盐酸盐
Molecular Weight
203.666 g/mol
Category
Organic Acids
Last updated
8/21/2026

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Physicochemical Properties

Melting Point207-211 °C
Boiling Point306.8ºC at 760 mmHg
Flash Point139.3ºC
Exact Mass203.071304
PSA55.48000
LogP2.40430

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Activity & Biological Data

Additional Information[1]. R S Shen, et al. Inhibition of dihydropteridine reductase by catecholamines and related compounds. Biochim Biophys Acta. 1983 Feb 28;743(1):129-35.

Customs & Trade Information

HS Code2922509090
Summary2922509090. other amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4-O-Methyldopamine hydrochloride?

The CAS number of 4-O-Methyldopamine hydrochloride is 645-33-0.

What are the molecular formula and molecular weight of 4-O-Methyldopamine hydrochloride?

4-O-Methyldopamine hydrochloride has molecular formula C9H14ClNO2 and molecular weight 203.666 g/mol.

Is 4-O-Methyldopamine hydrochloride hazardous?

4-O-Methyldopamine hydrochloride has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of 4-O-Methyldopamine hydrochloride?

For 4-O-Methyldopamine hydrochloride, Upstream Products: 1-(3-Hydroxy-4-methoxyphenyl)-2-nitroethene; Downstream Products: 7-Methoxy-1,2,3,4-tetrahydroisoquinolin-6-ol hydrochloride.

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

Last updated:

How to cite: Jingsj. "4-O-Methyldopamine hydrochloride (CAS 645-33-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-20692-9 (accessed 2026-10-28).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.