Importance

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Abstract

A photochromic compound has the formula (I) wherein R.sup.1 is selected from the group including substituted amino aryl moieties, substituted cyclic amino aryl moieties and substituted N-indolinoaryl or N-tetrahydroquinolino aryl groups, R.sup.3 is selected from the group including linear or branched C.sub.1 -C.sub.20 alkyl, linear or branched C.sub.2 -C.sub.20 alkenyl or polyalkenyl, C.sub.2 -C.sub.20 alkynyl or polyalkynyl, aryl, heteroaryl, linear or branched C.sub.1 -C.sub.20 alkyl aryl, linear or branched C.sub.1 -C.sub.20 alkyl-cycloalkyl or -bicycloalkyl or -tricycloalkyl or substituted -cycloalkyl or -bicycloalkyl or -tricycloalkyl, linear or branched C.sub.1 -C.sub.20 haloalkyl or perhaloalkyl, linear or branched C.sub.1 -C.sub.20 alkoxyalkyl or peralkoxyalkyl, linear or branched C.sub.1 -C.sub.20 alkylthioalkyl or peralkylthioalkyl, linear or branched C.sub.1 -C.sub.20 amino alkyl or peraminoalkyl, C.sub.3 -C.sub.20 cycloalkyl or substituted cycloalkyl, C.sub.4 -C.sub.20 bicycloalkyl or substituted bicycloalkyl, C.sub.6 -C.sub.20 tricycloalkyl or substituted tricycloalkl or linear or branched C.sub.1 -C.sub.20 hydroxyalkyl or perhydroxyalkyl; R.sup.4 and R.sup.5 which may be the same or different are R.sup.3 or R.sup.4 and R.sup.5 are conjoined to form a spiro linked C.sub.3 -C.sub.20 cyclic system or substituted cyclic system; and wherein R.sup.2 and R.sup.6 are each selected from R.sup.3 or hydrogen, halogen, nitro, nitroso, amino, acetamido, C.sub.2 -C.sub.10 N-alkylamido, alkoxycarbonyl, nitrile, carboxy, hydroxy, aryloxy, C.sub.1 -C.sub.10 alkoxy, a heteroatom which is O or N or S or P which in turn can be bonded either singly or multiply to carbon, oxygen, sulphur or nitrogen, C.sub.1 -C.sub.5 alkoxy or alkylthio or aryl or aryloxy or multiples thereof.

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First Claim