Heterogeneous palladium-catalyzed exchange labelling of representative organic compounds with tritium gas
作者:Philip G. Williams、Chit Than、Sadegh Rabbani、Mervyn A. Long、John L. Garnett
DOI:10.1002/jlcr.2580360102
日期:1995.1
alkanes and the alkyl chains of alkylbenzenes were rapidly and evenly labelled. Some aromatic compounds showed general ring exchange while others showed high specificity. These results for bulk palladium catalyst are strikingly different from those obtained with bulk platinum and supported palladium catalysts. The results are discussed in terms of currently accepted mechanisms of heterogeneous metal catalyzed
使用 NaBH4 还原的氧化钯或氯化物作为催化剂,一系列有机底物成功地与氚气交换。交换条件包括反应温度为 100 °C,反应时间为 3 天,并通过放射性气相色谱和 3 H NMR 光谱分析产物。芳香族和脂肪族化合物都进行了交换,22 种底物中的 18 种结合了 > 35% 的可用氚,并且大多数产品显示出高放射化学纯度。3 H NMR 分析表明,烷烃和烷基苯的烷基链均被快速且均匀地标记。一些芳香族化合物表现出一般的环交换,而另一些则表现出高特异性。本体钯催化剂的这些结果与使用本体铂和负载钯催化剂获得的结果截然不同。