Hydrodimerization is an organic reaction that couples two alkenes to give a symmetrical hydrocarbon. The reaction is often implemented electrochemically; in that case the reaction is called electrodimerization. The reaction can also be induced with samarium diiodide, a one-electron reductant.
Hydrodimerization is the basis of the Monsanto adiponitrile synthesis:
2CH2=CHCN + 2e− + 2H+ → NCCH2CH2CH2CH2CN
The reaction applies to a number electrophilic alkenes (Michael acceptors). 