pharmaceutical industry. Here, we report on a nanostructured nickel catalyst that enables the selective hydrogenation of purely aliphatic and functionalized olefins under mild conditions. The earth-abundant metal catalyst allows the selective hydrogenation of sterically protected olefins and further tolerates functional groups such as carbonyls, esters, ethers and nitriles. The characterization of our
官能化烯烃的选择性加氢在化学和制药工业中具有重要意义。在这里,我们报告了一种纳米结构的镍催化剂,该催化剂能够在温和条件下对纯脂肪族和官能化烯烃进行选择性加氢。地球上丰富的金属催化剂允许空间保护的烯烃的选择性氢化,并进一步耐受羰基、酯、醚和腈等官能团。我们催化剂的表征揭示了表面氧化金属镍纳米颗粒的形成,该纳米颗粒由活性炭载体上的 N 掺杂碳层稳定。
Scope and Mechanism in Palladium-Catalyzed Isomerizations of Highly Substituted Allylic, Homoallylic, and Alkenyl Alcohols
Herein we report the palladium-catalyzed isomerization of highly substituted allylic alcohols and alkenyl alcohols by means of a single catalytic system. The operationally simple reaction protocol is applicable to a broad range of substrates and displays a wide functional group tolerance, and the products are usually isolated in high chemical yield. Experimental and computational mechanistic investigations
diastereoselective radical 1,5 phenylmigration reactions fromsilicon in diarylsilyl ethers to various C-centered radicals to form the corresponding 3-phenylated alcohols are described. Functionalized aryl groups can also be transferred. The effect of the variation of the attacking radical on the aryl transfer reaction is discussed. Best results are obtained for the phenylmigration to nucleophilic secondary
Iridium-catalyzed isomerization of primary allylic alcohols under mild reaction conditions
作者:Luca Mantilli、Clément Mazet
DOI:10.1016/j.tetlet.2009.04.130
日期:2009.7
The isomerization of primaryallylicalcohols into the corresponding aldehydes has been accomplished using an analogue of Crabtree’s iridium hydrogenation catalyst and by adequately tuning the experimental conditions. A wide range of substrates is converted quantitatively into the desired aldehyde at room temperature in expedient reaction times by using catalyst loading as low as 0.25 mol %.