申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0551019A1
公开(公告)日:1993-07-14
A 3-(2-oxocyclohexyl)propionic acid ester of a specified formula, which has a terminal Cl-4 alkyl, is cyclized and dehydrogenated to form the corresponding coumarin or derivative thereof in the presence as catalyst of 0.1-5 wt%, by wt of the ester, of palladium supported mostly (preferably at least 90% of the Pd) in the surface portion of a carrier, which can be an element of Group IIA, IIIA or IVA or a compound thereof, e.g. carbon, used as a powder of particle size 1-50 µm.
The reaction is at 100-350°C (preferably 230-280°C), and can be in a solvent, and optionally with a co-catalyst.
The products are obtained in better yield than with prior forms of the catalyst, and are useful in the perfume industry.
根据指定的配方,将具有末端Cl-4烷基的3-(2-氧代环己基)丙酸酯环化并脱氢,在存在0.1-5重量%的钯催化剂的情况下(按酯的重量计),其中大部分(优选至少90%的Pd)支撑在载体的表面部分,该载体可以是IIA、IIIA或IVA族元素或其化合物,例如碳,以1-50μm的粒径粉末形式使用。反应温度为100-350°C(优选230-280°C),可以在溶剂中进行,也可以选择性地使用共催化剂。与先前形式的催化剂相比,产品产率更高,并且在香料行业中具有用途。