2627-95-4Relevant articles and documents
PROCESSES FOR SYNTHESIZING UNSYMMETRICAL DISILOXANES
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Paragraph 0044-0046, (2021/06/22)
Described herein are methods for making alkenyl disiloxanes, comprising combining an alkenyl halosilane with an alkyl halosilane and adding the mixture to water, an acidic aqueous solution, or a basic aqueous solution. The ratio of the alkenyl halosilane to the alkyl halosilane is about 10:1 to about 1:10. The alkenyl halosilane and the alkyl halosilane are mixed at about 20 °C to about 45 °C. The reaction product is separated and washed with saturated alkali carbonate solution.
Preparation method of 1-vinyl-1,1,3,3,3-pentamethyldisiloxane
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Paragraph 0039-0041, (2018/09/11)
The invention relates to a preparation method of 1-vinyl-1,1,3,3,3-pentamethyldisiloxane, prepared by: using 1,3-divinyl-1,1,3,3,-tetramethyldisiloxane ad 1,1,1,3,3,3-hexamethyldisiloxane as materials, carrying out rearrangement reaction under the catalytic action of a complexing catalyst KOH/18-crown ether-6; neutralizing the catalyst, filtering, and distilling filtrate. The macromolecular ring compound 18-crown ether-6 and KOH form the complexing agent; the compound reaction helps improve catalyst activity and efficiently catalyzes for rearrangement reaction. The macromolecular ring compound18-crown ether-6 and KOH form a complexing catalyst; complexing reaction is performed to obtain improved catalyst activity, and rearranging reaction is efficiently catalyzed. In addition, the preparation method is simple, the reacting is fast and stable, and the preparation method has the advantages of high yield, good safety, good environmental friendliness and the like.
NHO to aNHC Isomerization at a Pd0-Center
Schumann, André,Hering-Junghans, Christian
, p. 2584 - 2588 (2018/06/04)
N-heterocyclic carbenes (NHCs) are a highly important class of ligands in transition metal-mediated catalysis. Recently, a modification of the NHCs has received considerable interest, the N-heterocyclic olefins (NHOs) with an exocyclic methylene appended to the NHC. In here we investigated the propensity of NHOs to act as a ligands for Pd0 complexes derived from [Pd2(dvds)3]. The reaction of IPrCH2 and IMesCH2 with the Pd0 precursor [Pd2(dvds)3] resulted in the formation of abnormal N-heterocyclic carbene complexes [(aIPrCH3)Pd(dvds)] (1) and [(aIMesCH3)Pd(dvds)] (2). DFT calculations were applied to study this isomerization and to reveal the bonding in 1 and 2. In addition, the backbone-methylated NHOs MeIPrCH2 and mMeIMesCH2 (4) were shown not to undergo the isomerization observed in IPrCH2 and IMesCH2.