Ni , t
СH3-CH2-CH2-CH3 --------------------> CH2=CH-CH2-CH3
H2SO4 конц, t > 170
CH3-CH2-CH-CH2-CH3 -------------------------------> CH3-CH=CH-CH2-CH3 + H2O
I
OH
cпирт
CH3-СHBr-CH2-CH3 + KOH -----------------> CH3-CH=CH-CH3 + KBr + H2O
CH2Br-CHBr-CH2-CH3 + Zn ------> CH2=CH-CH2-CH3 + ZnBr2