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4-tert-Butylphthalic anhydride

Also known as: 5-tert-butyl-2-benzofuran-1,3-dione, 5-tert-butylisobenzofuran-1,3-dione, 5-(tert-butyl)isobenzofuran-1,3-dione, 4-tert-butylphthalic acid anhydride, 5-(1,1-dimethylethyl)-1,3-isobenzofurandione, 4-t-butylphthalic anhydride, 4-tert-butyl-phthalsaeure-anhydrid

4-tert-Butylphthalic anhydride (CAS 32703-79-0) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C12H12O3 and a molecular weight of 204.22200 g/mol. Key properties include a melting point of 70-75 °C(lit.), a boiling point of 136 °C / 2mmHg, a density of 1.206 g/cm3 and a flash point of 149.9ºC. 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 Nov 3, 2026.

CAS No.
32703-79-0
Jingsj CID
J-42887-5
Molecular Formula
C12H12O3
Molecular Weight
204.22200 g/mol
Category
Organic Acids
Last updated
11/3/2026
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Physicochemical Properties

Melting Point70-75 °C(lit.)
Boiling Point136 °C / 2mmHg
Density1.206 g/cm3
Flash Point149.9ºC
Exact Mass204.07900
PSA43.37000
LogP2.29470
Refractive Index1.551

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]. Larner B W, et al. 123. New intermediates and dyes. Part II. Preparation and properties of 4-tert.-butylphthalic anhydride. Orientation of its condensation products with benzenoid hydrocarbons. Journal of the Chemical Society, 1952:680-686.

Frequently Asked Questions

What is the CAS number of 4-tert-Butylphthalic anhydride?

The CAS number of 4-tert-Butylphthalic anhydride is 32703-79-0.

What are the molecular formula and molecular weight of 4-tert-Butylphthalic anhydride?

4-tert-Butylphthalic anhydride has molecular formula C12H12O3 and molecular weight 204.22200 g/mol.

Is 4-tert-Butylphthalic anhydride hazardous?

4-tert-Butylphthalic anhydride 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-tert-Butylphthalic anhydride?

For 4-tert-Butylphthalic anhydride, Upstream Products: 4-tert-butylphthalic acid, Naphthalene, 2,6-Di-tert-butylnaphthalene; Downstream Products: 4-tert-butylphthalic acid.

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-tert-Butylphthalic anhydride (CAS 32703-79-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-42887-5 (accessed 2026-11-09).

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