Ligandless Regioselective Hydrosilylation of Allenes Catalyzed by Gold Nanoparticles
摘要:
The first example of Au-catalyzed hydrosilylation of allenes is presented using recyclable gold nanoparticles as catalyst, without the requirement of any external ligands or additives. The hydrosilane addition takes place on the more substituted double bond of terminal allenes in a highly regioselective manner. The observed regioselectivity/reactivity modes are attributed to steric and electronic factors.
Nickel Nanoparticle Catalyzed Mono‐ and Di‐Reductions of
<i>gem</i>
‐Dibromocyclopropanes Under Mild, Aqueous Micellar Conditions
作者:Alex B. Wood、Margery Cortes‐Clerget、Joseph R. A. Kincaid、Bhornrawin Akkachairin、Vani Singhania、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1002/anie.202006162
日期:2020.9.28
either in the absence of ligand or in the presence of 2,2′‐bipyridine, this new technology can also be used to gain access to not only monobrominated cyclopropanes, interesting buildingblocks for further use in synthesis, but also mono‐ or di‐deuterated analogues. Taken together, this base‐metal‐catalyzed process provides access to cyclopropyl‐containing products and is achieved under environmentally