Patent ID: 7145050

Claim:
Process for preparing cycloalkadienes comprising the step of metathesizing cycloalkamonoenes, cyclopolyenes, acyclic polyenes or mixtures thereof in the liquid phase in the presence of a supported catalyst comprising: a) γ-Al 2 O 3 as a support material, b) from 1 to 12% by weight of Re 2 O 7 c) from 0 to 40% by weight of SnR 4 , SnO 2 or a mixture thereof, wherein R is an alkyl radical having from 1 to 8 carbon atoms, wherein that supported catalyst is modified by: d) at least one dopant selected from the group consisting of phosphors and cesium, and/or e) treatment with at least one mineral acid, wherein the % by weight are based on the total weight of the catalyst.