Phenothiazine and phenoxazine derivatives, process and...

Details Phenothiazine and phenoxazine derivatives, process and... Phenothiazine and phenoxazine derivatives, process and...

C - Chemistry, Metallurgy

07

D

42/1, 260/243.3,

C07D 265/38 (2006.01) B41M 5/20 (2006.01) C07D 279/30 (2006.01) G03G 5/09 (2006.01)

Patent

CA 1235124

PHENOTHIAZINE AND PHENOXAZINE DERIVATIVES PROCESSES AND MARKING SYSTEMS ABSTRACT OF THE DISCLOSURE 3-(N-R2-N-Acylamino)-7-(N-R3-N-R4-amino)-10-acyl- phenothiazines and phenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 3-(N-R2-amino)-7-(N-R3- N-R4-amino) phenothiazinium or phenoxazinium halide with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.

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