Drake, R. published the artcileOptimization of polystyrene resin-supported Pt catalysts in room temperature, solvent-less, 1-octene hydrosilylation using methyldichlorosilane, Category: chlorides-buliding-blocks, the publication is Combinatorial Chemistry and High Throughput Screening (2002), 5(3), 201-209, database is CAplus and MEDLINE.
Six precursor resins with systematic variation of porous parameters were prepared by suspension polymerization using specific compositions of divinylbenzene, styrene vinylbenzyl chloride (VBC) and 2-ethylhexan-1-ol (a porogen) and the surface areas from N2 sorption and BET anal. were ∼2-170 m2·g-1. The VBC content in each case was 38 mol% and these groups were aminated using the sodium salt of trimethylethylenediamine and Pt was introduced onto each resin at three different loadings (∼0.03, ∼ 0.2 and ∼ 0.4 mmol·g-1) by appropriate manipulation of K2PtCl4. The matrix of 18 resin-supported Pt complexes was then assessed for catalytic activity in the room temperature, solvent-less, hydrosilylation of 1-octene using methyldichlorosilane such that alkene:silane:Pt ratio was fixed as 2:1:1×10-3. Though all the catalysts showed activity lower than that of homogeneous Speier’s catalyst, most were sufficiently active to be potentially valuable heterogeneous catalysts in the laboratory, and indeed the plant. The most lightly loaded resins proved to be the least active and the remainders were recycled 5 times, and the best performers, the most highly loaded species, a further 5 times making 10 consecutive uses in all. A strong dependence on the porous structure of the resins was demonstrated with the activity rising systemically with the surface area. The two highest surface area highest loaded species displayed good activity even when used for the tenth time. The level of concurrent alkene isomerization observed was low throughout (<1%) making these heterogeneous species selective and highly active. Overall the derived catalysts are excellent candidates for use in the research laboratory, and with further development could also be valuable in continuous processes.
Combinatorial Chemistry and High Throughput Screening published new progress about 14799-93-0. 14799-93-0 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Dichloro(methyl)(octyl)silane, and the molecular formula is C9H20Cl2Si, Category: chlorides-buliding-blocks.
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