Catalytic hydrogen atom transfer from hydrosilanes to vinylarenes for hydrosilylation and polymerization

Parham Asgari, Yuanda Hua, Apparao Bokka, Chanachon Thiamsiri, Watcharapon Prasitwatcharakorn, Ashif Karedath, Xin Chen, Sinjinee Sardar, Kyungsuk Yum, Gyu Leem, Brad S. Pierce, Kwangho Nam, Jiali Gao, Junha Jeon

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Because of the importance of hydrogen atom transfer (HAT) in biology and chemistry, there is increased interest in new strategies to perform HAT in a sustainable manner. Here, we describe a sustainable, net redox-neutral HAT process involving hydrosilanes and alkali metal Lewis base catalysts—eliminating the use of transition metal catalysts—and report an associated mechanism concerning Lewis base-catalysed, complexation-induced HAT. The catalytic Lewis base-catalysed, complexation-induced HAT is capable of accessing both branch-specific hydrosilylation and polymerization of vinylarenes in a highly selective fashion, depending on the Lewis base catalyst used. In this process, the Earth-abundant, alkali metal Lewis base catalyst plays a dual role. It first serves as a HAT initiator and subsequently functions as a silyl radical stabilizing group, which is critical to highly selective cross-radical coupling. An electron paramagnetic resonance study identified a potassiated paramagnetic species, and multistate density functional theory revealed a high HAT character, yet multiconfigurational nature in the transition state of the reaction.

Original languageEnglish (US)
Pages (from-to)164-173
Number of pages10
JournalNature Catalysis
Volume2
Issue number2
DOIs
StatePublished - Feb 1 2019

Bibliographical note

Funding Information:
We are grateful for financial support from the National Institutes of Health (NIGMS; GM116031 to J.J. and GM117511-01 to B.S.P.), ACS Petroleum Research Fund (PRF number 54831-DNI1 to J.J.), National Science Foundation (CHE; 1709369 to B.S.P.), Swedish Research Council (VR 2015-04114 to K.N.) and University of Texas at Arlington (to K.N.). We acknowledge the NSF (CHE-0234811 and CHE-0840509) for partial funding of the purchases of the NMR spectrometers used in this work.

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