Bulletin of the Chemical Society of Japan p. 1311 - 1315 (1990)
Update date:2022-08-11
Topics:
Uchida, Kingo
Nakayama, Yasuhide
Irie, Masahiro
1,2-Bis(benzothiophen-3-yl)ethene derivatives, which possess thermally irreversible and fatique resistant photochromic properties, were synthsized. cis-1,2-Dicyano-1,2-bis(2-methylbenzothiophen-3yl)ethene Ia and 2,3-bis(2-methylbenzothiophen-3-yl)maleic anhydride 2a underwent reversible photocyclization to produce red-colored closed-ring forms with λmax at 507 and 544 nm, respectively.The closed-ring forms were stable for more than 3 weeks at 80 deg C.The coloration/decoloration (ring closure/opening)cycles were able to be repeated more than 1E4 times with keeping the adequate photochromic performance.
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