Patent · US Expired

Process for the preparation of 3-aryl-benzofuranones

US6989446B2 · kind B2 · utility

0Cited by

3References

4Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

Michael Tinkl · Weil am Rhein, DE
Samuel Evans · Marly, CH
Peter Nesvadba · Marly, CH

Key dates

Filing date	Jun 12, 2002
Grant date	Jan 24, 2006
Priority date	—
Expiry date	Jan 29, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C49/603
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for the preparation of compounds of formula I wherein the general symbols are as defined in claim 1, which process comprises reacting a compound of formula V wherein the general symbols are as defined in claim 1, with carbon monoxide in the presence of a catalyst.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.