A Platinum Molecular Complex Immobilised on the Surface of Graphene as Active Catalyst in Alkyne Hydrosilylation

Abstract

Supporting information for this article is given via a link at the end of the document.

Short-Chained Platinum Complex Catalyzed Hydrosilylation under Thermomorphic Conditions: Heterogeneous Phase Separation at Ice Temperature

“…When we compare the efficiency of our catalyst 2A with a heterogeneous molecular complex immobilized on the surface of graphene, catalyst 2A showed better catalytic efficiency at the elevated temperature. Mata [ 35 ] and his colleagues used 1 mol% catalytic loading of their catalyst in the similar reactions to obtain 40% yield after 3 h where TON and TOF are 40 and 13, respectively. They have further optimized the reaction and used 0.5 mol% loading to obtain 94% yield after 20 h. Where TON and TOF are 188 and 9.4, respectively.…”

“…The hydrosilylation of alkynes has been performed with a variety of metal catalysts, including Pt, Ir, Ru, Rh, and Co complexes, and usually produced three possible products, α, β-( E ) and β-( Z ) isomers [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Generally, β-( E ) is the thermo-dynamically favored isomer and dominates in most researches using aliphatic and aryl alkynes, such as Lewis’s work using Karstedt’s Pt catalyst [ 30 ], Marko’s work using N- heterocyclic carbene Pt(0) catalysts (>95% yield) [ 31 ], Ge’s work using bisphosphine Co catalysts (60–90% yield) [ 32 ], Jesus’s work using water-soluble N -heterocyclic carbene Pt(0) Complexes as a recyclable catalyst (58–97% yield) [ 33 , 34 ], and Mata’s work using a recoverable Pt catalyst immobilized on the surface of graphene (80–99% yield) [ 35 ]. Additionally, Chauhan and Sarkar’s work using Pt-nanoparticle catalyst (95–98% yield) [ 36 ] and Cai’s work using a reusable K 2 PtCl 4 /Xphos-SO 3 Na/PEG-400/H 2 O system (72–93% yield) [ 37 ] were reported to be efficient and recyclable to give β-( E ) vinylsilane.…”

A Sustainable Approach for Graphene Oxide‐supported Metal N‐Heterocyclic Carbenes Catalysts

“…The complex, 19@rGO was prepared by a direct immobilization of molecular catalyst [(MecC)Pt(Br) 2 (3-ClÀ Py)], (MesC = 1-mesityl-3-(pyren-1-ylmethyl)-imidazol-3-ylidene) (19) with rGO in DCM using sonication method (Scheme 53). [56] The elemental plati-num composition of 19@rGO was confirmed to be 4.6 wt% by ICP-MS. High-resolution TEM of 19@rGO showed the 2D formation of graphene oxide material without Pt nanoparticles formation. Elemental mapping of 19@rGO by EDS analysis confirmed the presence of elemental composition of Pt, N, Br, and Cl along with homogeneous distribution of Pt throughout the graphene oxide surface.…”

“…The complex, 19@rGO was prepared by a direct immobilization of molecular catalyst [(MecC)Pt(Br) 2 (3‐Cl−Py)], (MesC=1‐mesityl‐3‐(pyren‐1‐ylmethyl)‐imidazol‐3‐ylidene) ( 19 ) with rGO in DCM using sonication method (Scheme 53). [56] The elemental platinum composition of 19@rGO was confirmed to be 4.6 wt% by ICP‐MS. High‐resolution TEM of 19@rGO showed the 2D formation of graphene oxide material without Pt nanoparticles formation.…”

Organic platinum compounds containing one platinum–carbon bond. Synthesis, structure, possibilities of practical application

“…Ожидаемые спирты были получены с высокими выходами после основного гидролиза продуктов гидросилилирования, и многие функциональные группы не были затронуты. Комплекс платины (68), несущий N-гетероциклический карбеновый (NHC) лиганд, функционализированный пиреновой меткой, иммобилизованный на поверхности восстановленного оксида графена (rGO), является превосходным катализатором гидросилилирования алкинов [32]. Их реакции метатезиса с различными алкильными реагентами Гриньяра или LiHBEt 3 в эфирных или ареновых растворах приводят к образованию соответствующих алкильных или гидридных комплексов (70).…”