合成路线： Mg (CH3)2CHBr H2O HC-CH-CH2CH2OH PBr3 无水醚 CH2Ciz CH3 OH H3C-CH-CH2CH2Br Mg CHCOCH H2O CH3 H3CCH-CH2-CH2-C-CH3 无水醚 CH3 CH3 H H3CCH-CH2-CH=C-CH3 CH3 CH3