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4-Vinylphenylboronic acid

Also known as: (4-Ethenylphenyl)boronic acid, p-Vinylbenzeneboronic acid, 4-Vinylbenzeneboronic acid, 4-Styrylboronic acid, p-Styrylboronic acid, Styrene-4-boronic acid, p-Vinylphenylboronic acid, 4-Boronostyrene

4-Vinylphenylboronic acid (CAS 2156-04-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H9BO2 and a molecular weight of 147.967 g/mol. Key properties include a melting point of 190-193°C, a boiling point of 306.2±35.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 139.0±25.9 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H312 — Harmful in contact with skin and H332 — Harmful if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
2156-04-9
Jingsj CID
J-1306942-6
Molecular Formula
C8H9BO2
Molecular Weight
147.967 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Melting Point190-193°C
Boiling Point306.2±35.0 °C at 760 mmHg
Density1.1±0.1 g/cm3
Flash Point139.0±25.9 °C
Exact Mass148.069565
PSA40.46000
LogP2.07
Vapor Pressure0.0±0.7 mmHg at 25°C
Refractive Index1.539

GHS Safety & Compliance

IrritantSignal word: Warning
  • H302 — Harmful if swallowed
  • H312 — Harmful in contact with skin
  • H332 — Harmful if inhaled

Frequently Asked Questions

What is the CAS number of 4-Vinylphenylboronic acid?

The CAS number of 4-Vinylphenylboronic acid is 2156-04-9.

What are the molecular formula and molecular weight of 4-Vinylphenylboronic acid?

4-Vinylphenylboronic acid has molecular formula C8H9BO2 and molecular weight 147.967 g/mol.

Is 4-Vinylphenylboronic acid hazardous?

4-Vinylphenylboronic acid has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H312 — Harmful in contact with skin; H332 — Harmful if inhaled.

What are the upstream and downstream products of 4-Vinylphenylboronic acid?

For 4-Vinylphenylboronic acid, Upstream Products: 4-Chlorostyrene, Tributyl borate, 4-Bromostyrene; Downstream Products: 4-Vinylphenylboronic acid dibutyl ester, Suprofen, 4-(Trifluoromethyl)styrene.

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

Last updated:

How to cite: Jingsj. "4-Vinylphenylboronic acid (CAS 2156-04-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1306942-6 (accessed 2026-11-09).

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