3069-19-0Relevant articles and documents
THE PROCESS FOR THE PREPARATION AND USE OF HAIR TREATMENT COMPOSITIONS CONTAINING ORGANIC C1-C6 ALKOXY SILANES
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, (2022/01/12)
The subject of the present application is a method for the preparation and use of an agent for the treatment of keratinous material, in particular human hair, comprising the following steps: (1) Mixing one or more organic C1-C6 alkoxy silanes with water,(2) optionally, partial, or complete removal from the reaction mixture of the C1-C6 alcohols liberated by the reaction in step (1),(3) if necessary, addition of one or more cosmetic ingredients,(4) Filling of the preparation into a packaging unit,(5) Storage of the preparation in the packaging unit for a period of at least about 5 days; and(6) Application of the preparation on the keratinous material.
One-pot reduction-hydrophobization of heterogenized platinum with 1,1,3,3-tetramethyldisiloxane
Baltag, Laurentiu,Cazacu, Maria,Damoc, Madalin,Dinu, Maria Valentina,Ionita, Gheorghe,Macsim, Ana-Maria,Nicolescu, Alina,Stoica, Alexandru-Constantin
, (2021/11/09)
An original approach for the design of hydrophobized heterogeneous platinum-based catalytic systems is reported here. Heterogenization was performed by depositing the platinum precursor (H2PtCl6) on macroporous styrene-divinylbenzene (SDVB) beads with a high surface area, -330 m2?g?1, as determined by N2 sorption data, followed by treating with 1,1,3,3-tetramethyldisiloxane (TMDS) as Pt(IV) reducing agent without the need of special conditions. Simultaneously, the coupling by Si-O-Si bonds of the TMDS oxidation or hydrolysis intermediates endowed the SDVB-Pt systems with an enhanced hydrophobicity (up to 10 times higher than that of SDVB support). In addition, to obtain an optimum catalytic system, which stabilize the supported platinium against leaching, several mixtures of TMDS with other methylsiloxane precursors, namely, methyltrimethoxysilane (MTMS), (Formula presented.)-bis(trimethylsiloxy)poly(dimethylsiloxane-H-methylsiloxane) (PDMHS), and (Formula presented.)-bis(trimethylsiloxy)poly(dimethylsiloxane-co-vinylmethylsiloxane) (PDMVS), have been systematically investigated. The reduction of platinum, visible by an instant change in the color from yellow to black, was confirmed by X-ray photoelectron spectroscopy analysis, while its total content in the samples was determined quantitatively by atomic absorption spectroscopy. The obtained systems have been preliminarily assessed for catalytic activity in the hydrosilylation of 1,3-bis(vinyl)tetramethyldisiloxane and allyl alcohol with TMDS, and 1-hexene with trimethoxysilane, as model reactions. The results indicate the high suitability of these systems as catalysts for the selective anti-Markovnikov hydrosilylation of alkenes, as well as for the very fast oxidation-condensation homocoupling of H-silanes in presence of a green oxidation agent (air), under mild conditions, with the release of hydrogen and its in situ addition to the double bond.
Silicon-hydrogen addition reaction (by machine translation)
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Paragraph 0060; 0061, (2018/04/21)
The invention relates to the field of organic chemistry, in order to solve the addition reaction catalyst with hydrogen in the presence of the problem, the invention provides a method for addition reaction, in order to olefin and three b oxygen radical hydrogen silicane as raw materials, in order to b [(1 - mPEG - 3 - alkyl 2 - diphenyl [...] halide) rhodium chloride] as the catalyst, heating 50 - 90 °C stirring for 4 - 6 hours, filtration, vacuum distillation fraction of, hydrogen addition product is obtained. This method of mild reaction conditions, security, high reaction conversion rate, β addition product selectivity is strong, it is convenient to separate the products and the catalyst, the catalyst can be recycled. (by machine translation)
