Abstract
AbstractA procedure which utilizes a special sublimate condenser for preparation of pyromeconic acid (I) by decarboxylation of either meconic or comenic acid is reported. O‐Alkylation of pyromeconic acid with ethyl β‐diazopropionate ex situ yields ethyl β‐(4H‐pyran‐4‐on‐3‐yloxy)‐propionate (II), acidic hydrolysis of which affords the free acid III. The acid III is refractory to ring‐closure to a chromanone analog IV under a wide range of acidic conditions. O‐Allylation of 1 gives 3‐allyloxy‐4H‐pyran‐4‐one (V) as a low‐melting crystalline solid.
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