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Trimethylphenylammonium hydroxide

Also known as: Phenyltrimethylammonium hydroxide, N,N,N-Trimethylanilinium hydroxide, Trimethylanilinium hydroxide, Methelute, PTAH, Trimethylphenylammonium hydroxide solution, Benzenaminium, N,N,N-trimethyl-, hydroxide (1:1), Phenyltrimethylammonium hydroxide (20-25% in methanol), Trimethylphenylammonium hydroxide (TMAH), trimethyl(phenyl)azanium, hydroxide

Trimethylphenylammonium hydroxide (CAS 1899-02-1) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C9H15NO and a molecular weight of 153.221 g/mol. Key properties include a boiling point of 65 °C and a flash point of 10 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
1899-02-1
Jingsj CID
J-1394812-4
Molecular Formula
C9H15NO
Molecular Weight
153.221 g/mol
Category
Aromatic Hydrocarbons
Last updated
8/21/2026
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Physicochemical Properties

Boiling Point65 °C
Flash Point10 °C
Exact Mass153.115356
PSA23.06000
LogP1.70650
Refractive Indexn20/D 1.395

GHS Safety & Compliance

Flammable / Corrosion / Acute Toxicity / Health HazardSignal word: Danger
  • H225 — Highly flammable liquid and vapour
  • H301 — Toxic if swallowed
  • H311 — Toxic in contact with skin
  • H314 — Causes severe skin burns and eye damage
  • H331 — Toxic if inhaled
  • H370 — Causes damage to organs

Customs & Trade Information

HS Code2923900090
Summary2923900090 other quaternary ammonium salts and hydroxides。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Trimethylphenylammonium hydroxide?

The CAS number of Trimethylphenylammonium hydroxide is 1899-02-1.

What are the molecular formula and molecular weight of Trimethylphenylammonium hydroxide?

Trimethylphenylammonium hydroxide has molecular formula C9H15NO and molecular weight 153.221 g/mol.

Is Trimethylphenylammonium hydroxide hazardous?

Trimethylphenylammonium hydroxide has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.

What are the upstream and downstream products of Trimethylphenylammonium hydroxide?

For Trimethylphenylammonium hydroxide, Upstream Products: Phenyltrimethylammonium iodide; Downstream Products: 3-Methyluridine, 3'-O-Methylcytidine, 2'-O-Methylcytidine.

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

Last updated:

How to cite: Jingsj. "Trimethylphenylammonium hydroxide (CAS 1899-02-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1394812-4 (accessed 2026-11-09).

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