KCN,HOAc C.HsCH-CHCOC.Hs CH5CH(CN)CH2COCHs (93-96%) EtOH 0。+ HCN→ (85%) CN C.H5CH-CHCOC.Hs 1CHi→ C.HsCH-CHC(OH)(C.Hs)2(75%) 2)H20 (CH )Culi 1)Et20 2)H20 (98%) C6H5CH=CHCOC6H5 KCN ,HOAc EtOH C6H5CH(CN)CH2COC6H5 (93-96%) O + HCN CN O (85%) C6H5CH=CHCOC6H5 1)C6H5Li 2)H2O C6H5CH=CHC(OH)(C6H5 )2 (75%) O + (CH3 )2CuLi 1) Et2O 2) H2O O (98%)