CH3 CH2 CH ChCH 3Na+H2() H2C Br (x i)4CH3MgC1 Sic14 (x ii)2CH3 CH2CH(CH3)MgCI Hgcl ×i)(CH3H2)2CLi+H2O (x iv)BrCH2)4Br NaHs(Imol) HaOH (x v)(CH3h CHC(CH3)3 Br2(lmol 光 无水乙醚 2021/2/232021/2/23 6