Selective and Efficient Platinum(0)-Carbene Complexes As Hydrosilylation Catalysts

Abstract

The hydrosilylation reaction enables the production of silicon polymers. Platinum-carbene complexes are reported that catalyze the hydrosilylation reaction of alkenes with remarkable efficiency and exquisite selectivity and avoid the formation of platinum colloids. By-products, typically encountered with previous catalytic systems, are suppressed with these platinum derivatives.

Highly Active and Selective Platinum(0)‐Carbene Complexes. Efficient, Catalytic Hydrosilylation of Functionalised Olefins

“…[9] In a previous communication, we have reported that a novel class of platinum(0) carbene complexes 10 displayed good reactivity and excellent selectivity in the hydrosilylation of the model alkene, 1-octene. [10] In this article, we report the preparation of a variety of such platinum derivatives and the results of our study on the hydrosilylation of a range of functionalised alkenes catalysed by these organometallics. In addition, some insights into the mechanism of this transformation will be discussed.…”

C–H Borylation by Platinum Catalysis

“…The Pt(NHC)(dvtms) complexes have been reported to be effective catalysts for hydrosilylation. 31 In the current study, the introduction of NHCs generally led to an improvement in the turnover number (TON) values of the catalysts. For example, the IMes-ligated platinum complex 4a resulted in an 8-fold improvement in the TON to 40 (Entry 2), whereas the IPr complex 4b gave none of the desired borylated product (Entry 3).…”

“…It was previously proposed that the dvtms ligand in the platinum precursor decomposed prior to the formation of the catalytically active platinum species in hydrosilylation reactions involving Pt(NHC)(dvtms). 31,41 With this in mind, we investigated the reaction of dvtms with 1a in the presence of Pt(ICy)(dvtms) 4g to examine the reactivity of dvtms under the catalytic conditions used in the current CH borylation reaction. APCI-MS analysis revealed that the dvtms was completely consumed under the reaction conditions to give the corresponding tetraborylated product (eq 6).…”

Synthesis and Catalytic Applications of Mesoporous Polymer Colloids in Olefin Hydrosilylation

“…Markós group recently reported an NHC-Pt complex system that successfully catalyzed alkene hydrosilylation reactions, and demonstrated superior selectivity and activity compared to the commercial Speiers and Karstedts catalysts. [23,24] The NHC-Pt catalyst showed remarkable efficiency and selectivity, and avoided the formation of platinum colloids. Encouraged by these reports, MPP-NHC/pyrrolidine-Pt catalyst D was developed to catalyze olefin hydrosilylation reactions (Scheme 2).…”