Impregnated Platinum on Magnetite as an Efficient, Fast, and Recyclable Catalyst for the Hydrosilylation of Alkynes

Abstract

New impregnated platinum on magnetite catalyst has been prepared, characterized and used for the hydrosilylation of different alkynes. The catalyst showed a wide reaction scope, allowing its use for different functionalized alkynes, localized triple bonds, and silane reagents. The reaction is selective for the case of diynes, obtaining the desired mono-or dihydrosilylation processes. The reaction with disilane reagents lead to the incorporation of two alkyne units to the final product. The catalyst is easily prepared and handled, avoiding the use of expensive and difficult to handle organic ligands, and it could be removed from the reaction medium just by sequestering by a magnet. The catalyst could be reused up to ten times with exactly the same activity.

Soluble Pt Nanoparticles Stabilized by a Tris‐imidazolium Tetrafluoroborate as Efficient and Recyclable Catalyst for the Stereoselective Hydrosilylation of Alkynes

“…Thus, the recyclability of Pt/TiO 2 , and PtO/PtO 2 ‐Fe 3 O 4 in the hydrosilylation of terminal and internal alkynes and diynes has been described. The hydrosilylation of phenylacetylene has been performed with Pt nanoparticles in carbon nanoreactors, allowing for the evaluation of the effect of nanoscale confinement on the process selectivity .…”

Tuning the Activity and Selectivity of Phenylacetylene Hydrosilylation with Triethylsilane in the Liquid Phase over Size Controlled Pt Nanoparticles

“…The activation energy of the hydrogenation of benzene towards cyclohexane is approximately two times smaller on hexagonal Pt(111) surfaces compared to square Pt(100) surfaces [18]. Pt(100) and Pt (13,1,1) were four times more active in isobutene isomerization towards n-butane compared to Pt(111) and Pt (10,8,7) surfaces [19]. In the case of metal nanoparticles with the size of 1-10 nm, the concentration of the surfaces with different Miller indices are drastically changing as the size of the particles are changing.…”

“…Transition metal catalysts have been employed in hydrosylilation reactions, among which heterogeneous ones are gaining importance within the frames of green chemistry [3][4][5][6][7][8][9][10][11][12][13]. Supported Supported Pt [3][4][5][7][8][9]14], Pd [13], Pd alloys [15,16], and Au [6,10,12] particles have been shown to be efficient heterogeneous hydrosylilation catalysts leading mostly to the β-(E) product with high selectivity (Figure 1). In contrast with extensive efforts targeting high selectivities, the effect of metal particle size on hydrosilylation of acetylenes has rarely been reported in the literature [6,17], although the effect of particle size and morphology could have a pronounced effect of the outcome of the reaction.…”

Platinum(II) complexes bearing bulky Schiff base ligands anchored onto mesoporous SBA‐15 supports as efficient catalysts for hydrosilylation

“…[25] One of the feasible solutions to these issues is the heterogenization of homogeneous platinum catalysts, as it is widely accepted that heterogenized catalysts can have merits of easy separation and offer comparable activity to that provided by their homogeneous counterparts. Generally, platinum can be physically [26,27] or chemically [28,29] immobilized onto solid inorganic supports including titania, [30] Al 2 O 3 , [31] graphene [32,33] and magnetite [34] as well as onto organic polymeric supports. [35,36] To date, several immobilization strategies have been employed.…”