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 a reversible 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, alkoxy, etc.); B is of formula III (m is 1 or 2; R7 is alkyl; R8-R15 are each H, alkyl, cyano, nitro, etc.)], e.g. 1-(5-methoxy-1,2-dimethyl-3-indolyl)-2-(6-(2-(4-methoxyphenyl)1-ethenyl)-2- methyl-3-benzothienyl)-3,3,4,4,5,5-hexafluorocyclopentene. 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 derivative of formula V which is then put to Wittig reaction with a phosphonium salt.
ISHIKAWA ATSUSHI
FUJINO YASUMITSU
HORIKAWA YUKIO
IRIE MASAHIRO
Next Patent: FORMYL GROUP-BEARING DIARYLETHENE COMPOUND