(2E,6E,10Z)-7-ethyl-3,11-dimethyl-1-trityloxy-trideca-2,6,10-triene

(2E,6Z)-8-[(tert-butyldiphenylsilyl)oxy]-3-ethyl-7-methyl-2,6-nonadiene

(2E,6E)-8-[(tert-butyldiphenylsilyl)oxy]-2,6-diethyl-2,6-octadien-1-ol

lithium dimethylcuprate