ch2=ch2+hbr====ch3ch2brch3ch2br+mg====(醚催化）ch3ch2mgbr ch2=ch2+0.5o2=====（银催化，加热）环氧乙烷环氧乙烷+ch3ch2mgbr====（醚催化）ch3ch2ch2ch2ohch3ch2ch2ch2oh=====（酸催化，加热）ch3ch2ch2=ch2ch3ch2ch2=ch2+h2o=====2丁醇
