Trisubstituted Olefin 6 and Disubstituted A2-Olefin. A 327-mg (1.3 mmol) sample of alcohols 4 (from sodium borohydride reduction of dihydroestafiatone) was dissolved in 45 mL of HMPA and heated at 250" C for 50 min. I0 The cooled reaction mixture was then diluted with water and exhaustively extracted with hexane. The resulting oil (228 mg) was chromatographed on 45 g of 10% silver nitrate-silica gel with 10% ethyl acetate-hexane to ...
