Silica gel-mediated Michael addition of 1,3-dicarbonyl compounds to methyl vinyl ketone (MVK) and ethyl vinyl ketone (EVK) was carried out to give the corresponding adducts in quite excellent yields. The reactions could be carried out without any catalysts and solvents. In addition, highly toxic MVK and EVK could be employed without significant volatilization. Silica gel could be recycled five times without the decrease of the yields.

中文翻译：

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硅胶介导的无催化剂和无溶剂的1,3-二羰基化合物迈克尔加成到剧毒的甲基乙烯基酮中而不会挥发

进行了硅胶介导的1,3-二羰基化合物到甲基乙烯基酮（MVK）和乙基乙烯基酮（EVK）的迈克尔加成反应，从而以相当优异的收率得到了相应的加合物。反应可以在没有任何催化剂和溶剂的情况下进行。此外，可以使用剧毒的MVK和EVK，而不会明显挥发。硅胶可以循环使用五次而不会降低产量。