[2 + 2] Cycloaddition of optically active ketenes: synthesis of (−)-blastmycinone

Etude des configurations des ethoxy (benzyloxy)-3 methyl (butyl)-4 p-menthyl-3oxy-2 methyl-2 cyclobutanones obtenues par addition d'ethyl propenyl ether (benzyl hexene-1yl ether) sur le p-menthyl-3oxy methyl cetene. La configuration absolue des C3 et C4 de la butyl-4 benzyloxy-3 methyl-2 p-menthyl-3oxy-2 cyclobutanone est determinee par sa conversion en (−)-blastmycinone