Rearrangements of α-alkoxycarbonyldiarylmethyl cations lead to 9-fluorenecarboxylic esters. Decarboxylation of these esters generates the fluorene derivatives 9a-f. The precursors to the cations are the α-hydroxyesters 6a-g.This conversion constitutes a facile synthesis of benzofluorenes.
α-烷氧基羧基二芳基甲基阳离子的重排导致9-
芴酸酯的生成。这些酯的脱羧反应生成
氟烯衍
生物9a-f。这些阳离子的前驱体是α-羟基酯6a-g。这一转化构成了苯并
芴类化合物的简便合成。