新型光致变色材料的合成研究

Synthesis of a New Type of Phototropic Material

以联苯甲酰、邻氯苯甲醛为原料 ,经过环合、氧化合成了光致变色化合物 2 ,2′ 二邻氯苯基 4 ,4′ ,5 ,5′ 四苯基 1,2′ 二咪唑。讨论了多种因素对氧化反应收率的影响 ,其最佳工艺条件为 :以乙二醇一乙醚为分散剂 ,单体 2 邻氯苯基 4 ,5 二苯基咪唑与氧化剂K3 [Fe(CN) 6]的物质的量比为 1∶2 ,反应温度 2 0～ 2 5℃ ,反应时间 5h ,总收率为 84 .9%。

Phototropic material 2,2′ bis(o chlorophenyl) 4,4′ 5,5′ tetraphenyl 1,2′ biimidazole(HABI) was prepared from benzil and o chlorobenzaldehyde through cyclization and oxidation reactions.Experiments were done under different conditions of the oxidation reaction and the optimal conditions were determined.At 20-25 ℃,the cyclization product 2 (o chlorophenyl) 4,5 diphenylimidazole(TAI) was solvated in HOCH 2CH 2OCH 2CH 3 and oxidized at mole ratio of TAI to K 3)=1∶2 to give HABI in 84 9% yield after reacting for 5 h.