Red coloring hyperchromic 3H-naphtho[2,1-B]pyrans
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United States of America Patent
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Sep 25, 2001
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N/A
app pub date -
Dec 16, 1999
filing date -
Apr 4, 1997
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Expired
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Abstract
Red coloring hyperchromic compounds have the formula: ##STR1## where R.sup.1 is H, NR.sup.2 R.sup.3, OR.sup.4, SR.sup.4 or R.sup.7 wherein R.sup.2 and R.sup.3 are alkyl or carbocyclic groups or together with the nitrogen to which they are attached form a heterocyclic ring; R.sup.4 is the same as R.sup.1 or is alkyl, perhaloallyl, aryl or heteroaryl; R.sup.7 is alkyl, haloalkyl, alkylthio, aryl, arylthio, heteroaryl, halogen, nitrile, carboxylate, ester, nitro, or a carbocyclic or heterocyclic ring fused to faces f, gh, i, j or k; and R.sup.5 is a cyclic aminoaryl group, an indolinoaryl group, a tricyclic nitrogen heterocycle, or an unsaturated cyclic aminoaryl group.
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