A direct synthesis of methanodibenzo[1,3]dioxocins
Abstract
Condensation of 2H-1-benzopyrans with 2-chloromercurioresorcinol and lithium chloropalladite yields 1-hydroxy-6,12-methano-12H-dibenzo[d,g][1,3]dioxocins together with the anticipated 7-hydroxypterocarpans.