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把试剂引入惰性无机载体而成的载体试剂,近十年来研究颇多。本文着重介绍它在合成上的应用。一、硅藻土(celite) 在硅藻土中引入新鲜制成的碳酸银(Ag_2CO_3)不仅易于操作,而且可以再生,成为高效的氧化剂。使用时可将它与反应物、溶剂(苯、甲苯、二氯甲烷、饱和烷烃等)一起回流,过滤后蒸去溶剂就可得所需产物。 1.主要反应 (1)伯、仲醇氧化成醛酮 Ag_2CO_3/celite对醇的氧化很有效,特别是对酸、碱敏感的官能团,在反应中不受影响,
The introduction of reagents into inert inorganic carriers made of carrier reagents, a lot of research in the past decade. This article focuses on its synthesis application. First, the celite (celite) Introduced in diatomaceous earth freshly made silver carbonate (Ag_2CO_3) is not only easy to operate, but also renewable, as an efficient oxidant. It can be used with the reactants, solvents (benzene, toluene, methylene chloride, saturated alkanes, etc.) together reflux, filtered and evaporated to give the desired product. 1. Main reactions (1) Oxidation of primary and secondary alcohols to aldehydes and ketones Ag_2CO_3 / celite is very effective in the oxidation of alcohols, especially for acid and alkali sensitive functional groups, which are not affected in the reaction.