JPS6092234A Current Assignee Sumitomo Chemical Co Ltd 1983 Example 1 Cyclopentene of 84, 19 and ethanol of 85.39 were charged into a 200 cc round bottom flask with a cooler, 19.4F bismuth nitrate and 10.6P as catalyst After adding a commercially available 5% PD-activated carbon supported catalyst (manufactured by Nippon Engelhard Co., Ltd.), 99% pure oxygen (the remainder being nitrogen) was continuously supplied at 51/r into the well-stirred liquid. The reaction temperature was set at 45°C, and after 4 hours of reaction, the reaction product was analyzed, and the conversion rate of cyclohentene was 75%. The selectivity for cyclopentanone was 72%. Comparative Example 1 The same treatment as in Example 1 was carried out except that bismuth nitrate was not added. As a result of analysis of the obtained reaction product, the conversion rate of cyclopentene was 26%, and the selectivity of cyclopentanone was 1% or less.