A unique type of platinum catalysis that is valuable for the synthesis of α,β-unsaturatedketones is described. In the presence of PtCl2, (2-arylethynyl)trimethylsilanes reacted with H2O at 30 °C to give 1,4-diarylbut-3-en-2-ones in moderate to good yields. (2-Alkylethynyl)trimethylsilanes could be efficiently converted into the corresponding hydrative dimerization products by a modified Pt catalyst
描述了一种对 α,β-不饱和酮的合成有价值的独特类型的铂催化。在 PtCl 2存在下,(2-芳基乙炔基)三甲基硅烷与 H 2 O 在 30 °C 下反应,以中等至良好的收率得到 1,4-二芳基丁-3-en-2-酮。 (2-烷基乙炔基)三甲基硅烷可以通过改性Pt催化剂体系有效转化为相应的水合二聚产物。机理研究表明酰基铂中间体参与催化循环。
Stereodivergent additions of allylic chromium(III) reagents to aldehydes
作者:Carole Jubert、Stefan Nowotny、Dirk Kornemann、Iris Antes、Charles E. Tucker、Paul Knochel
DOI:10.1021/jo00050a005
日期:1992.11
In contrast to gamma-monosubstituted allylic chromium reagents, gamma-disubstituted allylic chromium(III) organometallics undergo highly stereoselective stereodivergent additions to aldehydes.