(a)形成低聚物 烯烃二聚: CH CH CH3 CH CH2=C CH3-C=CH2 50%H2S0 CH3-C-CH2-CCH2 CH3-C-CH=C-CH3 100C CH3 CH 80% 20% 机理: CH CH3 CH CH2=C CH2=C(CH3) 2 CH3-C CH3-C-CH2-C-CH3 CH CH CH3 CH3 CH3-C-CH2 -C=CH CH3-C-CH=C-CH CH(a) 形成低聚物 烯烃二聚： CH3 -C=CH2 CH3 + 50% H2 SO4 100 C 。 CH3 -C-CH2 -C=CH2 CH3 CH3 CH3 + CH3 -C-CH=C-CH3 CH3 CH3 CH3 CH2 =C CH3 CH3 80% 20% 机理： CH3 -C-CH2 -C=CH2 CH3 CH3 CH3 + CH3 -C-CH=C-CH3 CH3 CH3 CH3 CH2 =C CH3 CH3 CH3 -C + CH3 CH3 H + CH2 =C(CH3 )2 CH3 -C-CH2 -C-CH3 CH3 CH3 CH3 + -H +