| abstract |
(57) [Summary] (Modified) [Solution] General formula 1 (R is hydrogen, C 1 -C 5 alkyl, cyano or halogen; M is hydrogen or a colorless cation forming a salt; n is 2) (R and n have the meanings given above, M'is hydrogen, a salt-forming colorless cation or optionally substituted phenyl), and the compound is reductively deaminated and optionally substituted phenyl. It is produced by converting the group M ′ into the group M. Also, various methods for producing the compound of the general formula 2 and various novel intermediates used therein. [Effect] This compound is useful as an optical brightener. |