Process for preparing dioxazine compounds

US6359131B1 · kind B1 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Gert Nagl · Niederdorfelden, DE
• Wolfgang Bauer · Krefeld, DE
• Peter Kempter · Bad Soden, DE

Key dates

• Filing date: Mar 24, 2000
• Grant date: Mar 19, 2002
• Expiry date: Mar 24, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B19/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The process provides a process for preparing dioxazines by ring closure of a compound of the formula (II) in which R1 is hydrogen or C1-C8 alkyl in the presence of a ring closure agent, which comprises using as reaction medium an aryl alkyl ether of the formula (III) or a mixture of aryl alkyl ethers of the formula (III) in which n is an integer from 0 to 2 and R2 is ethyl if n is 0 or is methyl if n is 1 or 2.