| abstract |
Process for the dimerization of acrylonitrile to predominantly straight-chain 1,4-dicyanobutenes (DCB). The ACN is contacted with an organic phosphinite or phosphonite having at least one substituted aryl group attached to the phosphorus atom in the presence of an inert proton-donating solvent and, optionally, an inert non-hydroxylic cosolvent preferably a hydrocarbon, the ACN and solvent(s) being substantially dry. Selectivities of 95% or even 98%, with respect to 1,4 - DCN, may be obtained. |