PURPOSE: To provide a new compound excellent in thermal stability, moisture resistance and photosensitivity, and having highly durable photochromism in terms of repeating color development/fading, thus useful as an optically recording material, etc.
CONSTITUTION: The objective compound of formula I [n is 2-5; A is of formula II (R1 and R2 are each alkyl; R3-R6 are each H, alkyl, dialkylamino or alkoxy); B is of formula III (m is 0-2; R7 is alkyl; R8-R15 are each H, alkyl, dialkylamino, cyano or alkoxy)], e.g. 1-(1,2-dimethyl-3-indolyl)-2-(6-formyl-2-methyl-3- benzothienyl)-3,3,4,4,5,5-hexafluoroyc lopentene. The compound of the formula I can be obtained by reaction between a compound of formula IV (Z is Br or I) and an aryllithium derivative followed by formylation of the resulting product to produce a formylated diarylethene compound of formula V which is then put to repeated Wittig reaction with formylmethylenetriphenylphosphorane.
ISHIKAWA ATSUSHI
FUJINO YASUMITSU
HORIKAWA YUKIO
IRIE MASAHIRO
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