temperatures in the presence of ketones results in the efficient formation of 2-alken-1,5-diols with predominant or exclusive (E) configuration. In the absence of HMPA higher temperatures are needed for the coupling and the regioisomeric 1,3-diols are also obtained.
在酮存在下,在低温下用SmI 2 -HMPA还原
乙烯基氧杂
环戊烷可有效形成具有主要或排他(E)构型的2-烯丙基1,5
-二醇。在不存在HMPA的情况下,偶联需要更高的温度,并且还获得了区域异构的1,3
-二醇。