A. Tolmachev, A. Y. Mitrokhin, V. S. Tolmacheva
Aug 1, 1993
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Journal
Chemistry of Heterocyclic Compounds
Abstract
The readily formed addition products of dialkylphosphites and 1,3,3-trimethyl-2-methyleneindoline have been used to synthesize 1,2,3,3-tetramethyl-3H-indolium salts and their derivatives substituted in the benzene ring. In most cases the protecting phosphorus group can be readily removed by adding mineral acids.