申请人:CIBA SPEC CHEM WATER TREAT LTD
公开号:WO2000041996A1
公开(公告)日:2000-07-20
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 C1-20alkyl, optionally substituted C3-4alkenyl, optionally substituted C5-7cycloalkyl or optionally substituted benzyl, R2 is an optionally substituted C1-20alkyl, optionally substituted C3-4alkenyl or optionally substituted C5-7cycloalkyl, A is either S or NR3, R3 is an optionally substituted C1-20alkyl, optionally substituted C3-4alkenyl or optionally substituted C5-7cycloalkyl, 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 C1-20alkyl, optionally substituted C3-4alkenyl, optionally substituted C5-7cycloalkyl or optionally substituted benzyl and, R6 is hydrogen or an optionally substituted C1-20alkyl, optionally substituted C3-4alkenyl or optionally substituted C5-7cycloalkyl, 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 S+ or N+R¿3.