Dimerization of norbornene on zeolite catalysts

The high activity and selectivity of H-Beta and H-ZSM-12 zeolites in the dimerization of norbornene was established. The norbornene conversion reached 100% in chlorinated paraffin and argon gas medium, with a selectivity of dimer formation of 88%–98%. Four stereo-isomers of the bis-2,2'-norbornylidene structure were identified in the dimer fraction, with the (Z)- anti -bis-2,2′-norbornylidene prevailing over the others. The high catalytic efficiency of H-Beta and H-ZSM-12 zeolites in producing bisnorbornylidenes by the dimerization of norbornene gave a norbornene conversion of 100% and a selectivity of dimer formation of 88%–98%.