Synthesis of Divinyl-1-oxaspiro[m.4]alkanes and Divinyl-1-oxaspiro[m.4]alkan-2-ols from 1,8-Bis(trimethylsilyl)-2,6-octadiene and Acyl Chlorides - Tubul, Arlette; Ouvrard, Philippe; Santelli, Maurice (Synthesis, 1991)