Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Enone , obtained by regioselective alkylation of with , was cyclized stereoselectively to the enol acetate , subsequently transformed to (±)-oplopanone ( ) by a short reaction sequence. ... ) bzw. 43.1, 213.1 und 41.1 ppm ( ), jeweils für C-1, C-2, C-3. ... Für alle dargestellten ...