7422-52-8Relevant articles and documents
Investigation on modified polyether as an efficient CO2thickener
Zhang, Yongfei,Zhu, Zewen,Tang, Jun
, p. 651 - 656 (2021)
The development of a new generation of carbon dioxide (CO2) thickeners is significant for improving carbon dioxide flooding technology. Here, co-polymers based on epoxide heptamethyltrisiloxane and glycidyl phenyl ether are prepared, and their solubility and thickening ability in CO2 are evaluated. The solubility of the modified polyethers in CO2 remarkably increases with the modification of heptamethyltrisiloxane and decreases upon introducing phenyl glycidyl ether. With incorporation of 18.4 mol% phenyl groups into the co-polymer, the co-polymer exhibits a highly increased thickening effect, while maintaining high solubility in CO2. Implications of the present study for the preparation of a highly efficient CO2 thickener are discussed.
Modification of (poly)siloxanes via hydrosilylation catalyzed by rhodium complex in ionic liquids
Marciniec, Bogdan,Maciejewski, Hieronim,Szubert, Karol,Kurdykowska, Magdalena
, p. 605 - 611 (2006)
The hydrosilylation of 1-heptene, allyl glycidyl ether and, allyl polyether by heptamethylhydrotrisiloxane and poly(hydro, methyl)(dimethyl)siloxane catalyzed by rhodium(I) complexes (particularly [{Rh(μ-OSiMe 3)(cod)}2]) in imidazolium ionic liquids (especially [TriMIM]MeSO4) gives heptyl and glycidyloxy functional (poly)siloxanes and silicone polyethers with high yield and selectivity. The catalytic system based on rhodium siloxide can be easily separated from the product and successfully reused up to five times. Springer-Verlag 2006.
Accelerated Anti-Markovnikov Alkene Hydrosilylation with Humic-Acid-Supported Electron-Deficient Platinum Single Atoms
Antonietti, Markus,Badamdorj, Bolortuya,Janik, Michael J.,Liu, Kairui,Yang, Fan
supporting information, p. 24220 - 24226 (2021/10/07)
The hydrosilylation reaction is one of the largest-scale applications of homogeneous catalysis, and Pt homogeneous catalysts have been widely used in this reaction for the commercial manufacture of silicon products. However, homogeneous Pt catalysts result in considerable problems, such as undesired side reactions, unacceptable catalyst residues and disposable platinum consumption. Here, we synthesized electron-deficient Pt single atoms supported on humic matter (Pt1@AHA_U_400), and the catalyst was used in hydrosilylation reactions, which showed super activity (turnover frequency as high as 3.0×107 h?1) and selectivity (>99 %). Density functional theory calculations reveal that the high performance of the catalyst results from the atomic dispersion of Pt and the electron deficiency of the Pt1 atoms, which is different from conventional Pt nanoscale catalysts. Excellent performance is maintained during recycle experiments, indicating the high stability of the catalyst.
Developing a Highly Active Catalytic System Based on Cobalt Nanoparticles for Terminal and Internal Alkene Hydrosilylation
Jakoobi, Martin,Dardun, Vincent,Veyre, Laurent,Meille, Valérie,Camp, Clément,Thieuleux, Chloé
, p. 11732 - 11740 (2020/10/23)
This work describes the development of easy-To-prepare cobalt nanoparticles (NPs) in solution as promising alternative catalysts for alkene hydrosilylation with the industrially relevant tertiary silane 1,1,1,3,5,5,5-heptamethyltrisiloxane (MDHM). The Co NPs demonstrated high activity when used at 30 °C for 3.5-7 h in toluene, with catalyst loadings 0.05-0.2 mol %, without additives. Under these mild conditions, a set of terminal alkenes were found to react with MDHM, yielding exclusively the anti-Markovnikov product in up to 99% yields. Additionally, we demonstrated the possibility of using UV irradiation to further activate these cobalt NPs not only to enhance their catalytic performances but also to promote tandem isomerization-hydrosilylation reactions using internal alkenes, among them unsaturated fatty ester (methyl oleate), to produce linear products in up to quantitative yields.
