the feasibility of the use of an acetal as the linking group for the diene and dienophile in the intramolecular Diels-Alder reaction has been demonstrated. Although some limitations were encountered, in general the mixed acetals examined showed excellent thermal stability with no tendency to undergo elimination of methanol even at temperatures in excess of 200°C for several hours providing the expected
已经证明了使用
缩醛作为分子内Diels-Alder反应中的二烯和亲二烯体的连接基团的可行性。尽管遇到了一些限制,但是通常所检查的混合
乙缩醛显示出优异的热稳定性,即使在超过200°C的温度下持续数小时也没有消除
甲醇的趋势,从而提供了预期的环加合物,具有良好至优异的收率。