* $Al_4C_3+12H_2O\rightarrow 3CH_4+4Al(OH)_3$$CH_4\xrightarrow[làm lạnh nhạt]{1500^0}C_2H_2+H_2$
$C_2H_2+H_2O\overset{xt H_2SO_4}{\rightarrow}CH_3-CHO$
$CH_3-CHO+2AgNO_3+3NH_3+H_2O\overset{t^o}{\rightarrow}CH_3COONH_4+2NH_4NO_3+2Ag(kt)$
*$CH_3-CHO\overset{Ni,t^o}{\rightarrow}CH_3CH_2OH$
$C_2H_5OH\overset{500^0,MgO,Zn}{\rightarrow}CH_2=CH-CH=CH_2+2H_2O+H_2$
Trùng hợp buta-1,3-đien xt $Na,t^o\rightarrow $Cao su buna