| 摘要 |
PURPOSE:In obtaining the titled compound having various uses such as drug, coating compound, etc., by dehydrogenating a cyclic ketone in a gaseous phase, to improve selectivity, by using a specific catalyst having a limited supporting zone of noble metal on a carrier. CONSTITUTION:A cyclic ketone shown by formula I (R<1>-R<5> are H or <=18C aliphatic or aromatic hydrocarbon residue; n is r or 3; one unsaturated bond exists in the ring when n is 3)is dehydrogenated in a gaseous phase by the use of a catalyst wherein >=80% total amount of palladium and/or platinum 2 is supported on a surface zone amounting to <=2/3 volume of a carrier 1, the amount of palladium and platinum supported is 0.05-15wt%, preferably 0.1-2wt% and the section of the prepared catalyst has a shape like an eggshell to give a compound shown by formula III. |
