A study of the stereochemical factors involved in multistep 1,2-hydride transfers
作者:Ted S. Sorensen、Steven M. Whitworth
DOI:10.1021/ja00174a029
日期:1990.8
all-trans-1,2,3,4,5-pentamethylcyclopentyl cation have been developed. These cations both undergo very rapid multiple 1,2-hydride shifts, but the rate of this process is about 40 times faster in the all-trans case. This implies that the stereochemistry of the penultimate hydride in the rearrangement cascade can affect the rate of a given 1,2-hydride shift, i.e. that it is better if this penultimate
已经开发了合成全(顺式和全反式 1,2,3,4,5-五甲基环戊基阳离子。这些阳离子都经历了非常快速的多次 1,2-氢化物转移,但该过程的速率在全反式情况下大约快 40 倍。这意味着重排级联中倒数第二个氢化物的立体化学会影响给定的 1,2-氢化物移位的速率,即如果这个倒数第二个氢化物位于转移到迁移中。这项工作的另一个含义是母体环戊基阳离子中的氢化物转移可能是部分有序的,并且通常快速的多次氢化物转移可能受到相同的标准