Production of acrylic monomers

US6506939B1 · kind B1 · utility

Assignee

• Ciba Specialty Chemicals Water Treatments Ltd. · GB

Inventors

• Peter Stuart Littlewood
• Michael Singh · Leeds, GB

Key dates

• Filing date: Jul 13, 2001
• Grant date: Jan 14, 2003
• Expiry date: Jul 13, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/62
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a mixture comprising a compound of formula (1) and a compound of formula (2) wherein R1 is an optionally substituted C1-20 alkyl, optionally substituted C3-4 alkenyl, optionally substituted C5-7 cycloalkyl or optionally substituted benzyl, R2 is an optionally substituted C1-20 alkyl, optionally substituted C3-4 alkenyl or optionally substituted C5-7 cycloalkyl, A is either S or NR3, R3 is an optionally substituted C1-20 alkyl, optionally substituted C3-4 alkenyl or optionally substituted C5-7 cycloalkyl, or R2 and R3 together form a 5-7 membered ring which can contain an oxygen atom, R4 is hydrogen or methyl, R5 is an optionally substituted C1-20 alkyl, optionally substituted C3-4 alkenyl, optionally substituted C5-7 cycloalkyl or optionally substituted benzyl and, R6 is hydrogen or an optionally substituted C1-20 alkyl, optionally substituted C3-4 alkenyl or optionally substituted C5-7 cycloalkyl, or R5 and R6 together form a 5-7 membered ring which can contain an oxygen atom, which comprises reacting in an alkaline or base medium a compound of formula (3) wherein X− is an anion, R1, R2, R3, R4, R5 and R6 have the same meaning as above, A+ is…