Patent · US Expired

Process for the preparation of 2,6-dichlorobenzoxazole

US4658034A · kind A · utility

1Cited by

5References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Otto Arndt · Hofheim, DE
Theodor Papenfuhs · Frankfurt, DE

Key dates

Filing date	Feb 21, 1985
Grant date	Apr 14, 1987
Priority date	—
Expiry date	Feb 21, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D263/58
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of 2,6-dichlorobenzoxazole, which comprises reacting 6-chlorobenzoxazolone in the presence of chlorine, phosphorus trichloride and phosphoryl chloride, or in mixtures of phosphorus pentachloride and phosphoryl chloride, at temperatures of 150.degree. to 170.degree. C., under pressure, the weight ratio of chlorine and phosphorus trichloride to phosphoryl chloride or of phosphorus pentachloride to phosphoryl chloride being 0.15:1 to 0.60:1.

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