2-13 用R,S构型命名法命名下列各个化合物的构型;并说明哪对互为对映体?哪对互为非对映体?-|||-Br CH3 CH3 CH3-|||-H + CH3 H一 Br Br H H Br-|||-H OH H3C H H 十 CH3 H3C OH-|||-CH3 OH OH H-|||-(1) (2) (3) (4)

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