A process for the conversion of olefinic hydrocarbons according to the olefin reaction including olefin disproportionation by contacting the olefinic hydrocarbon with a catalyst comprising a compound of vanadium or niobium complexed with NO and a selected complexing agent (e.g., benzoic acid) and combined with an organoaluminum compound (e.g., methylaluminum sesqui-chloride). The metal complexes which form a part of the catalysts are also claimed. 10 Claims, No Drawings
This application is a divisional of copending application Ser. No. 694,875, filed Jan. 2, 1968, now U.S. Pat. No. 3,562,178, which is a continuation-in-part of application Ser. No. 635,656, filed May 3, 1967, now abandoned.
1,5-Hexadiene is cyclized to cyclohexene by contacting 1,5-hexadiene with a mixture of a first catalyst selected from the group consisting of chromium oxides, chromium chlorides, chromium bromides, molybdenum oxides, molybdenum chlorides, molybdenum bromides, tungsten oxides, tungsten chlorides, tungsten bromides, iron oxides, cobalt oxides, nickel oxides, elemental sulfur, SiO.sub.2, Al.sub.2 O.sub.3, vanadium metal, vanadium oxides, VOF.sub.3, and mixtures thereof, and a second catalyst selected from a tin (IV) halide and mixtures thereof.
