CaC2–>C2H2–>C2H6–>C2H5Pr
СаС2+ 2 H2O-> C2H2 + Ca(OH)2
C2H2+ 2 H2 -(Ni,t)-> C2H6
C2H6+ Br2 -(УФ)-> C2H5Br + HBr