Synthesis and reactions of 3‐iodo‐4<i>H</i>‐pyran‐4‐ones

Abstract

Abstract 3‐Iodo‐4 H ‐pyran‐4‐ones have been synthesised in excellent yield by the reaction of acetylenic β‐diketones with iodine monochloride and were converted into the corresponding 4 H ‐pyran‐4‐thiones. The iodopyrones and thiopyrones gave with methylamine the respective N ‐methylpyridones and thiopyridones. The structure of the above compounds was confirmed from their spectral characteristics.