The title photochromic compounds 4 photocyclise to thermally stable blue and infrared active 7-dicyanomethylene-5-oxo-5,7,8,8a-tetrahydro-2-substituted-4,8a-dimethylfuro[33,4-f]benzofurans or benzothiophenes 5 which absorb at longer wavelengths (>100 nm) than the photocyclised compounds 2 from the corresponding photochromic fulgides 1.
标题光致变色化合物 4 经光循环生成热稳定的蓝色和红外活性 7-二
氰亚甲基-5-氧代-5,7,8,8a-四氢-2-取代-4,8a-二甲基
呋喃并[33,4-f]
苯并呋喃或
苯并噻吩 5,其吸收波长(大于 100 纳米)比相应光致变色富集物 1 光循环生成的化合物 2 更长。