In order to study the structural limits in the design of molecular motors, a tert-butyl substituted analogue was prepared. The unexpected photochemical and thermal isomerisation processes and the stereochemistry of new overcrowded alkene are described. The bis tert-butyl substituted alkenes were synthesised in a five-step sequence with an overall yield of 7.5%. Structural assignments of the isomers
为了研究分子马达设计中的结构限制,制备了叔丁基取代的类似物。描述了意外的光
化学和热异构化过程以及新的过度拥挤的烯烃的立体
化学。以五步顺序合成双叔丁基取代的烯烃,总收率为7.5%。基于实验数据的异构体的结构分配得到了烯烃的所有四个异构体的计算的支持。X射线晶体分析表明,强烈不稳定的光
化学生成的顺式异构体具有强烈扭曲的烯烃(扭转角39度)。