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5-Chloro-1(3H)-isobenzofuranone

Also known as: 5-Chlorophthalide, 5-Chloro-3H-2-benzofuran-1-one, 5-Chloro-3H-isobenzofuran-1-one, 5-chloro-1,3-dihydro-2-benzofuran-1-one, 1(3H)-Isobenzofuranone,5-chloro-, NSC 49581

5-Chloro-1(3H)-isobenzofuranone (CAS 54109-03-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H5ClO2 and a molecular weight of 168.57700 g/mol. Key properties include a boiling point of 363.9ºC at 760mmHg, a density of 1.428g/cm3 and a flash point of 205.9ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
54109-03-4
Jingsj CID
J-1500553-5
Molecular Formula
C8H5ClO2
Molecular Weight
168.57700 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Boiling Point363.9ºC at 760mmHg
Density1.428g/cm3
Flash Point205.9ºC
Exact Mass167.99800
PSA26.30000
LogP2.01040
Refractive Index1.601

Customs & Trade Information

HS Code2932209090
Summary2932209090. other lactones. 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-1(3H)-isobenzofuranone?

The CAS number of 5-Chloro-1(3H)-isobenzofuranone is 54109-03-4.

What are the molecular formula and molecular weight of 5-Chloro-1(3H)-isobenzofuranone?

5-Chloro-1(3H)-isobenzofuranone has molecular formula C8H5ClO2 and molecular weight 168.57700 g/mol.

What are the upstream and downstream products of 5-Chloro-1(3H)-isobenzofuranone?

For 5-Chloro-1(3H)-isobenzofuranone, Upstream Products: (2-Bromo-5-chlorophenyl)methanol, 4-Chlorobenzoic acid, Dibromomethane; Downstream Products: 5-Cyanophthalide, 4-chloro-2-formylbenzoic 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. "5-Chloro-1(3H)-isobenzofuranone (CAS 54109-03-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1500553-5 (accessed 2026-11-09).

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