Studies on new synthetic pathways to .DELTA..ALPHA.,.BETA.-butenolides from .ALPHA.-methylbutanolides. III. Regiospecific preparation of .ALPHA.-methyl-.DELTA..ALPHA.,.BETA.-butenolides and .ALPHA.-methylene-.GAMMA.-butyrolactones by electrolysis of .ALPHA.-carboxy-.ALPHA.-methylbutanolides and by oxidation of .ALPHA.-dimethylamino-.ALPHA.-methylbutanolides.

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