Patent · US Expired

Process for preparing 2-chlorobenzoxazoles

US4517370A · kind A · utility

2Cited by

1References

11Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Johannes Becherer · Maintal, DE
Klaus Kuhlein · Kelkheim, DE
Ulrich Kussmaul · Karben, DE

Key dates

Filing date	Feb 18, 1983
Grant date	May 14, 1985
Priority date	—
Expiry date	Feb 18, 2003

Classification

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

Abstract

In the process for preparing 2-chlorobenzoxazoles of the formula ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently of one another, H, chloro or alkyl having 1 to 4 carbon atoms, which comprises reacting chlorine with 2-mercaptobenzoxazoles of the formula ##STR2## wherein the improvement comprises providing a melt of previously prepared 2-chloro-benzoxazole, adding the 2-mercaptobenzoxazole reactant to the 2-chlorobenzoxazole melt and simultaneously or subsequently passing chlorine into the melt, with the proviso that substituents R.sup.1 to R.sup.4 are identical in both the 2-chlorobenzoxazole melt and the 2-mercaptobenzoxazole reactant.

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