Regiospecific syntheses of quinones using vinylketene acetals derived from unsaturated esters
Jacques Savard and Paul Brassard
Tetrahedron Letters
Volume 20, Issue 51, 1979, Pages 4911-4914
doi:10.1016/S0040-4039(01)86747-2
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http://dx.doi.org/10.1016/S0040-4039(01)86747-2