3-substituted carbonyloxy-7-disubstituted amino-10-substituted carbonylphenothiazines
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United States of America Patent
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Aug 5, 1986
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N/A
app pub date -
Sep 3, 1985
filing date -
Jul 31, 1984
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Abstract
3-(R-Carbonyloxy)-7-(N-R.sup.1 -N-R.sup.2 -amino)-10-(RCO)-phenothiazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 7-(N-R.sup.1 -N-R.sup.2 -amino)phenothiazin-3-one with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with about two molecular proportions of an acylating agent.
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