Patent · US Expired

Method for the nuclear chlorination of ortho-xylene

US6930216B2 · kind B2 · utility

1Cited by

9References

15Claims

0Family size

Assignee

Clariant Corporation · DE

Inventors

Karl E. Mack · Wiesbaden, DE
Hans-Jurgen Leitung · Frankfurt am Main, DE
Daniel Decker · Castle Rock, US

Key dates

Filing date	Sep 10, 2003
Grant date	Aug 16, 2005
Priority date	—
Expiry date	Sep 11, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A method for the nuclear chlorination of ortho-xylene using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The co-catalyst used is preferably tetrachlorinated 2,8-dimethylphenoxathiin, in particular 1,3,7,9-tetrachloro-2,8-dimethylphenoxathiin of the formula

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