A series of nineteen new 2,4,4,6-tetraphenyl-4H-thiopyrans both symmetrically and asymmetrically functionalized in the 3- and 5-positions of the 4H-thiopyran ring (-Br, -NO2, -CN) and/or in the 4-positions of the 2- and 6-phenyl groups (-Br, -CN, -OMe, -CO-Ph, -COCF3, -CO2H) was prepared and the influence of the substituents on their photocolouration was followed. The title compounds were prepared by substitution reactions of the parent thiopyrans or by cyclization of suitably substituted 1,3,3,5-tetraarylpentane-1,5-diones. The substances lacking the 3,5-substituents exhibited blue or green UV-photocolouration while the 3- and/or 5-substituted species did not. Typical bleaching process for a selected compound is analyzed in terms of dispersive first-order kinetics.
一系列新的对称和非对称功能化的19个2,4,4,6-四苯基-4H-硫喹啉化合物在4H-硫喹啉环的3和5位(-Br,-NO2,-CN),以及2-和6-苯基团的4位(-Br,-CN,-OMe,-CO-Ph,-COCF3,-CO2H)进行了制备,并跟踪它们的光致变色性能。这些标题化合物是通过对母硫喹啉的取代反应或对适当取代的1,3,3,5-四芳基戊二酮进行环化制备的。缺少3,5-取代基的物质表现出蓝色或绿色的紫外光致变色,而具有3和/或5-取代基的物种则不具有这种性质。对所选化合物的典型漂白过程进行了以色散一级动力学为基础的分析。