A process is provided for the production of compounds having the formula:
in which R is hydrogen, C1-C5alkyl, cyano or halogen; M is hydrogen or a salt-forming colourless cation; and n is 2;
which process comprises reductively de-aminating a compound having the formula:
in which R and n have their previous significance and M' is hydrogen, a salt-forming colourless cation or optionally substituted phenyl; and converting any optionally substituted phenyl group M' to a group M.
The present invention also provides processes for the production of the compounds of formula (2) and various novel intermediates for use in the new processes.
The compounds of formula (1) are useful as fluorescent whitening agents.
提供了一种生产具有以下式子的化合物的工艺:
其中 R 是氢、C1-C5 烷基、氰基或卤素;M 是氢或成盐的无色阳离子;n 是 2;
该工艺包括还原脱氨具有以下式子的化合物
其中 R 和 n 具有其先前的意义,M'是氢、成盐的无色阳离子或任选取代的苯基;以及将任选取代的苯基基团 M'转化为基团 M。
本发明还提供了生产式(2)化合物的工艺和用于新工艺的各种新型中间体。
式(1)化合物可用作荧光增白剂。