Nano-dispersed platinum(0) particles stabilized in a range of organically modified silicate (ORMOSIL) matrices are investigated as sustainable catalysts for the hydrosilylation of alkenes and alkynes. In this study, five different siloxane matrices including triethoxysilane (HTEOS), methyltriethoxysilane (MTES), ethyltriethoxysilane (ETES), triethoxyvinylsilane (TEVS) and propyltriethoxysilane (PTES) are investigated, and the distribution of the metal particles in these materials analyzed by transition electron microscopy (TEM). The particles appeared to be generally of a small size, with a diameter of ca. 2–5 nm in each of these catalysts, however the distribution is not equally uniform from one matrix to the other. HTEOS, MTES and ETES that respectively carry a hydrogen, a methyl and an ethyl group on the triethoxysilane moiety, displayed a more uniform distribution, while particles appeared to be more scattered in the remaining matrices. Catalysts with a uniform particles distribution produced higher and consistent yields, while those with poor particles distribution produced lower and almost random yields, suggesting that the uniformity in particle distribution, and by extension the nature of the siloxane matrix, are important for the catalytic properties of these materials. The scope of the reaction was broadened to a range of olefins, with a goal of investigating the tolerability of the reaction toward a number of reactive functional groups, resulting in the preparation of 28 compounds. This catalytic system also enabled the hydrosilylation of a limited number of alkynes under the optimized reaction conditions.

中文翻译：

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纳米分散的铂（0）在有机改性的硅酸盐基质中，作为可持续的烯烃和炔烃区域选择性加氢硅烷化催化剂†

在一系列有机改性的硅酸盐（ORMOSIL）基质中稳定的纳米分散铂（0）颗粒被研究为烯烃和炔烃氢化硅烷化的可持续催化剂。在这项研究中，研究了五种不同的硅氧烷基质，包括三乙氧基硅烷（HTEOS），甲基三乙氧基硅烷（MTES），乙基三乙氧基硅烷（ETES），三乙氧基乙烯基硅烷（TEVS）和丙基三乙氧基硅烷（PTES），并通过过渡电子分析了这些材料中金属颗粒的分布显微镜（TEM）。颗粒看起来通常是小尺寸的，直径约为1。在每种催化剂中2-5 nm，但是，从一种基质到另一种基质的分布不均等。在三乙氧基硅烷部分分别带有氢，甲基和乙基的HTEOS，MTES和ETES表现出更均匀的分布，而颗粒似乎在剩余的基质中更分散。具有均匀颗粒分布的催化剂产生较高且一致的产率，而具有较差颗粒分布的催化剂产生较低且几乎无规的产率，这表明颗粒分布的均匀性以及通过扩展硅氧烷基体的性质对于催化剂的催化性能很重要。这些材料。为了研究反应对许多反应性官能团的耐受性，反应的范围扩大到烯烃的范围。制备了28种化合物。该催化体系还能够在优化的反应条件下将数量有限的炔烃进行氢化硅烷化。