Dehydrogenative condensation of SiH and SH bonds. A metal-catalyzed protocol to stable thiopolysiloxanes
摘要:
Dehydrocoupling of polyhydrosiloxanes with thiols proceeded smoothly in the presence of Wilkinson's catalyst to furnish polythioethers in high yields under mild conditions. The process is free of rearrangement and crosslinking reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Bis(chloromethylsilyl)amine and bis(chloromethylsilyl)methylamine; preparation, reactivity and spectroscopic studies of their stereoisomers and conformers ‡
作者:Holger Fleischer、Donald C. McKean、Colin R. Pulham、Michael Bühl
DOI:10.1039/a708220g
日期:——
The compounds NH(SiHMeCl)2 1 and NMe(SiHMeCl)2 2 have been prepared by treating SiHMeCl2 with CaCl2·8NH3 and NH2Me respectively. Each was characterised by elemental analysis, mass spectrometry, NMR and IR spectroscopy. Dipole moments were also measured. The NMR spectra indicate that both compounds form 1â¶1 mixtures of the rac and meso diastereomers, their abundances corresponding to a statistically controlled synthetic pathway. The NMR and mass spectra also show that 1,5-dichloro-1,2,3,4,5-pentamethyltrisilazane, SiHMe[NMe(SiHMeCl)]2 3, which is formed as a side product in the synthesis of 2, also consists of two diastereomers. Variable-temperature 1H NMR spectra of NH(SiHMeCl)2 indicate participation of H(N) in hydrogen bonding. The compound is decomposed by heat and reacts with pyridine to form NH4Cl, SiHMeCl2 and polysilazanes, whereas NMe(SiHMeCl)2 shows only slight decomposition up to 80 °C and does not react with pyridine. Infrared spectra in the ν(SiH) region are interpreted in terms of the results of ab initio calculations of frequency, intensity and conformer abundance. The two bands near 2200 cmâ1 in the spectrum of 2 have their origin in two effects: different orientations of the SiâH bonds relative to the SiâNâSi plane in several conformers and an unprecedented strong dipoleâdipole coupling between the two SiâH bond stretching motions in situations where the bonds are roughly parallel. The absence of such an observed splitting for 1 is likely to be due in part to signal averaging during a free internal rotation. Significant couplings are also calculated to occur between SiâCl bond-stretching motions, whose source must be different from that for the SiâH bond stretches.
[EN] FUNCTIONALIZED CYCLOSILAZANES AS PRECURSORS FOR HIGH GROWTH RATE SILICON-CONTAINING FILMS<br/>[FR] CYCLOSILAZANES FONCTIONNALISÉS UTILISÉS EN TANT QUE PRÉCURSEURS POUR DES FILMS CONTENANT DU SILICIUM À TAUX DE CROISSANCE ÉLEVÉ
申请人:VERSUM MAT US LLC
公开号:WO2018217877A1
公开(公告)日:2018-11-29
Described herein are functionalized cyclosilazane precursor compounds and compositions and methods comprising same to deposit a silicon-containing film such as, without limitation, silicon oxide, silicon nitride, silicon oxynitride, silicon carbonitride, silicon oxycarbonitride, or carbon-doped silicon oxide via a thermal atomic layer deposition (ALD) or plasma enhanced atomic layer deposition (PEALD) process, or a combination thereof.
Reaction of dialkyldichloro- and alkyldichloro-silanes with methylamine
作者:E. A. Semenova、D. Ya. Zhinkin、K. A. Andrianov
DOI:10.1007/bf00921352
日期:1962.11
Dehydrogenative condensation of SiH and SH bonds. A metal-catalyzed protocol to stable thiopolysiloxanes
作者:Bhanu P.S Chauhan、Philip Boudjouk
DOI:10.1016/s0040-4039(99)02260-1
日期:2000.2
Dehydrocoupling of polyhydrosiloxanes with thiols proceeded smoothly in the presence of Wilkinson's catalyst to furnish polythioethers in high yields under mild conditions. The process is free of rearrangement and crosslinking reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.