Catalysis and regioselectivity of quinone Diels–Alder reactions
作者:James B. Hendrickson、Vishwakarma Singh
DOI:10.1039/c39830000837
日期:——
In a series of six different cycloadditions of unsymmetrical quinones and alkyl-substituted butadienes, TiCl4 afforded considerable catalysis (–78 °C) and gave regioselectivity identical with that of the thermal reaction (200 °C) and therefore complementary to that BF3 catalysis.