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A SIMPLE SYNTHESIS OF DE-AB-CHOLESTA-8(14),22-DIEN-9-ONE BY HIGHLY STEREOSELECTIVE DOUBLE MICHAEL ADDITION INVOLVING ALKENYLCOPPER-PHOSPHINE COMPLEX, VINYL KETONE, AND 2-METHYL-2-CYCLOPENTENONE FOLLOWED BY CLAISEN REARRANGEMENT AND RHODIUM-PROMOTED DECARBONYLATION
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Voronkov M. G., 1975, IAN SSSR KH, P2471