(1)(CH3)2CHCICH2I(2) CHs CH2CH2Br (3)Cl2CHCH3 (4)(CH3)3N-CH2 CH2Br (5)CH3 C-C H C6H5C l2 CHCH3 （C H3 ）3 N CH2 CH2 Br + （C H3 ）2 CHClCH2I C6 H5 C H2 C H2 Br C6 H5 H C C H C H3 O (1) (5) (3) (4) (2)