COOH CH2OH COOCH2
1 + 1 ===(浓H2SO4加热）=== 1 +2H2O
COOH CH2OH COOCH2
此外,也有可能
COOH CH2OH
1 + 1 ===(浓H2SO4加热）=== HOOC-COOCH2-CH2OH+H2O
COOH CH2OH
(1表示连接 C-C键）