Chalk-Harrod mechanism and modified Chalk-Harrod mechanism …
Hydrosilylation reactions catalyzed by platinum catalysts commonly follow Chalk-Harrod and modified Chalk- Harrod mechanisms (Figure 3), rendering side-reactions possible that yield unfavorable...
Hydrosilylation - Chemistry LibreTexts
2023年6月30日 — A well-known mechanism of metal catalyzed hydrosilylation is the Chalk-Harrod mechanism. It proceeds through oxidative addition of the Si-H to the metal center and then alkene insertion to the metal hydride. Reductive elimination of …
Recent Advances in Catalytic Hydrosilylations: Developments …
2020年7月15日 — Deuterium-labeling studies support the classic Chalk–Harrod mechanism with a Co–H intermediate resulting from oxidative addition of the silane to the metal center for the cobalt/bisphosphine system.
A theoretical investigation of the Chalk–Harrod and modified Chalk …
2004年6月15日 — The set of these processes are known as the Chalk–Harrod mechanism and the modified Chalk–Harrod mechanism, respectively. The main goal of this work has been to identify the rate determining step of both mechanisms.
Mechanistic insights into the hydrosilylation of allyl compounds ...
2012年11月1日 — The Chalk–Harrod mechanism (CH), which is widely accepted for the Pt-catalyzed hydrosilylation of olefins [17] and the modified variant thereof (mCH) [18], respectively, can solely explain the formation of the desired product c (Scheme 2).
Mechanisms of Co2L8 (L = CO, CNR)-Catalyzed Hydrosilylation of …
2023年10月10日 — For the hydrosilylation of alkenes catalyzed by Co 2 L 8 (L = CO, CNR), the Type II Chalk–Harrod cycle (the CH-II cycle) starting from HCoL 4 ([2H]L) and the Type II modified Chalk–Harrod cycle (the mCH-II cycle) from Me 3 SiCoL 4 ([2Si]L) have been proposed as the reaction mechanisms, but neither mechanism is fully consistent with the ...
Stereospecific Si-C coupling and remote control of axial ... - Nature
2020年6月9日 — In the more favourable pathway (path A of Supplementary Fig. 8) migratory insertion of an Pd/olefin hydride complex followed by reductive Si–C coupling (simplified as Chalk–Harrod mechanism ...
Accelerated Anti‐Markovnikov Alkene Hydrosilylation with …
2021年9月2日 — As proposed by Chalk and Harrod, the reaction mechanism of Pt-catalyzed alkene hydrosilylation can be divided into three sequential steps: Si–H oxidation addition to Pt, alkene insertion into the Pt−H bond and Si–C reductive elimination. 27 However, for the modified Chalk–Harrod mechanism, the second step is alkene insertion into the Pt ...
Cobalt-catalyzed alkyne hydrosilylation as a new frontier to ...
During the past few years, a number of well-defined, robust cobalt-catalyst platforms that broadly operate either the Chalk–Harrod or a modified Chalk–Harrod mechanism have emerged as a new frontier in the field of selective alkyne hydrosilylation.
Coordination Assistance: A Powerful Strategy for Metal-Catalyzed …
2023年1月11日 — First, we describe our early work aimed at controlling the regio- and enantioselectivity of hydroalkynylation using disubstituted enamide as the substrate. Both α- and β-alkynylation were achieved by channeling the reaction pathway into a Chalk–Harrod or modified Chalk–Harrod mechanism.
- 某些结果已被删除