| 摘要 |
PURPOSE:In obtaining the titled compound useful in various use fields by dehydrogenating a cyclic ketone in a gaseous phase, to improve yield in high activity and economically, by using a platinum or palladium catalyst supported on alumina having high strength, low cost and specific surface area as a cerrier. CONSTITUTION:A cyclic ketone shown by formula I (R<1>-R<5> are H or <=18C aliphatic or aromatic hydrocarbon residue; n is 5 or 3; one unsaturated bond exists in the ring when n is 3) is dehydrogenated in a gaseous phase by using a catalyst wherein palladium an/or platinum is supported on alumina having <=100m<2>/g surface area as a carrier and the amount of palladium and/or platinum supported is preferably 0.05-15wt%, especially 0.1-2wt% to give a compound shown by formula II. The reaction is preferably carried out in a gaseous phase and at the beginning of the reaction, another gas is advantageously added to the vapor of the raw material. The alumina having <=100m<2>/g surface are is obtained by calcining alumina available of the market at high temperature. |
