Spontaneous aromatization of Diels–Alder adducts in the reaction of alkatrienylphosphonates with dialkyl esters of acetylenedicarboxylic acid
Abstract
The reaction of dialkyl (3-methylpenta-1,2,4-trienyl)phosphonates with dialkyl esters of acetylenedicarboxylic acid proceeds via a novel spontaneous aromatization of the Diels–Alder adducts leading to benzylphosphonic acid derivatives.