Effects of Host−Guest Recognition on Kinetics of Diels−Alder Reaction of Quinocrown Ethers with Cyclopentadiene
作者:Akihiko Tsuda、Takumi Oshima
DOI:10.1021/jo010991e
日期:2002.2.1
Diels-Alder reactions of 15-21-membered quinocrown ethers 1a-c and 18-membered quinobenzocrown ether 1d with cyclopentadiene were catalyzed by the addition of alkali, alkaline earth metal and ammonium perchlorates, and scandium trifluoromethane-sulfonate. The alkali metal and ammonium ions brought about a fairly selective rate-acceleration for each crown ether due to the size-fitted ion-in-the-hole