反应能量图： 6G2 AGi.4 Free Energy H.C CH一CH 1.4 1,2 H2C=CH一CH一CH2l,2 Addition H,C=CH-CH-CH2 + Hr: :Br: CH2-CH=CH-CH2 1,4 Addition r H Reaction Coordinate 反应能量图： Free Energy Reaction Coordinate Free Energy