Abstract
A general and practical route has been considered for the synthesis of stable heterocyclic phosphorus ylides 3a–c by a one-pot condensation reaction between dialkyl acetylenedicarboxylate and triphenylphosphine in the presence of -NH heterocyclic compounds such as 2,4-dimethyl-3-acetyl pyrrole. The stable ylides 3a–b exist in solution as a mixture of the two isomers, while 3c indicates only one isomer. For this reason, the assignments of more stable Z- or E-isomers as the major or minor forms were investigated using the theoretical calculations. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.
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