Of azomethine ylides, recent advances

Azoles, basicity and acidity of, 41, 187 Azomethine ylide chemistry, recent advances in, 45, 231... 

In the third article, Porter describes the chemistry of thiophenium salts and ylids, to which he has contributed extensively. The chemistry of 1,4-diazocines is presented by Perlmutter this article follows an earlier review by the same author on azocines in Volume 31 of Advances in Heterocyclic Chemistry. The final article of this volume, and the second contribution from Japan, is by Tsuge and Kanemasa and deals with recent advances in azomethine ylide chemistry. 

Recent advances in the control of absolute stereochemistry in Diels-Alder reactions of 2-pyrones with dienophiles have been reviewed. The position of the electron-withdrawing group on simple y-pyrones is a decisive factor in the 4 - - 2-cycloaddition of y-pyrones with Danishefsky s diene and with azomethine ylides. The solid-state photo-4 -I- 2-cycloadditions of 2-pyrone-5-carboxylates with maleimides give only the... 

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