Activation of platinum catalysts with oxygen to enhance hydrosilylation of unactivated alkyl-, dialkyl-, and trialkylsilanes with 1-alkenes. Synthesis of tetraalkylsilanes

Onopchenko, Anatoli; Sabourin, Edward T.

doi:10.1021/jo00227a033

Cited by 37 publications

(20 citation statements)

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“…[ 33 ] The oxygen atom did some good to the catalytic hydrosilylation reaction of alkenes. [ 8,34,35 ] We speculate that the insertion of the oxygen atom was beneficial to the catalytic activity of the cobalt complex catalyst and the catalytic hydrosilylation reaction of alkenes. A reaction may occur between the phosphine ligand and the Co metal center, which will help activate the alkene with the Co‐phosphine ligand stabilizing the intermediate formed.…”

Section: Resultsmentioning

confidence: 99%

Highly active cobalt complex catalysts used for alkene hydrosilylation

Liu

Bai

et al. 2021

Applied Organom Chemis

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A series of nitrogen phosphine ligands were synthesized, and the hydrosilylation reaction of alkenes catalyzed using MCl2 in the presence of these ligands was investigated. FeCl2/1(N1, N1, N2, N2‐Tetrakis[(diphenylphosphino)methyl]ethane‐1,2‐diamine) showed low catalytic activity. MnCl2/1, CrCl3/1 and NiCl2/1 showed some catalytic activity. The CoCl2/N,P‐ligand catalyst system showed high activity as well as excellent selectivity (The selectivity of the β‐adduct was ~100%.) in the hydrosilylation reaction. CoCl2/1 showed the highest catalytic activity (~ >99.9% conversion of 1‐octene). Additionally, no α‐adduct, dehydrogenative silylation product and octane were detected.

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Section: Resultsmentioning

confidence: 99%

Highly active cobalt complex catalysts used for alkene hydrosilylation

Liu

Bai

et al. 2021

Applied Organom Chemis

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“…Si-[Pt]-H complex is known to form by oxidative addition, [35][36][37] and [Pt]-oxygen complex has been reported to significantly promote platinum catalyzed hydrosilylation reactions. 38,39 These compounds may allow the reaction with oxygen to occur at moderate temperatures, thereby changing the main oxidized structures produced.…”

Section: Resultsmentioning

confidence: 99%

Highly stretchable or extremely soft silicone elastomers? One reaction to make them all - from easily available materials!

Madsen

Skov

2021

Preprint

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An easy curing reaction to prepare silicone elastomers is reported, in which a platinum catalyzed reaction of telechelic/multi-hydrosilane (Si-H) functional polydimethylsiloxane (PDMS) in the presence of oxygen and water leads to slow crosslinking. This curing chemistry allows versatile tailoring of elastomer properties, which exceed their intrinsic limitations. Both highly stretchable silicone elastomers and extremely soft silicone elastomers are prepared by creating highly entangled elastomers and bottle-brush elastomers from commercial precursor polymers, respectively. The highly stretchable elastomers can be uniaxially stretched to a maximum strain of 2800% and their areas can be biaxially extended 180-fold. The extremely soft silicone elastomers exhibit shear moduli of 1.2-7.4 kPa, depending on composition, values that are comparable to hydrogels and human soft tissues. The reported curing chemistry can be used to prepare a range of silicone elastomers with carefully tailored mechanical properties.

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“…1). The literature [22,26] suggests that tetraalkylsilanes bearing one short and three long alkyl substituents are accessible through this route in 70-80% yield. In these examples, the organomagnesium and organolithium reagents provide lower yields.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of new carbosilane dendrimers with hydrophilic end-groups. Polyols

Comanita

Roovers

1999

Designed Monomers and Polymers

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The synthesis and characterization of a series of four-, eight-, 16-, and 32-arm carbosilane dendrimers are reported. The four-arm dendrimer was synthesized via the reaction of silicon tetrachloride with a primary organomagnesium compound. The other dendrimers were obtained through an efficient hydrosilylation of polyolefinic dendritic cores with functionalized alkylhydrosilanes. The latter reaction holds promise for the synthesis of larger generation carbosilanes with various hydrophilic end-groups. These compounds should find use as multifunctional anionic initiators for the synthesis of dendrimer-polymer hybrids.

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Activation of platinum catalysts with oxygen to enhance hydrosilylation of unactivated alkyl-, dialkyl-, and trialkylsilanes with 1-alkenes. Synthesis of tetraalkylsilanes

Cited by 37 publications

References 0 publications

Highly active cobalt complex catalysts used for alkene hydrosilylation

Highly active cobalt complex catalysts used for alkene hydrosilylation

Highly stretchable or extremely soft silicone elastomers? One reaction to make them all - from easily available materials!

Synthesis of new carbosilane dendrimers with hydrophilic end-groups. Polyols

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