The 15N–29Si spin–spincouplingconstants in silylamines have been measured from 29Si satellites in their natural abundance 15N n.m.r. spectra in an INEPT sequence for accumulation of signals and interpreted in terms of Fermi-contact interaction; the sensitivity of 1J(15N–29Si) to dπ–pπ bonding was noted.
sec-butylamino (NHsBu), n-octylamino (NHnOct), n-dodecylamino (NHnDodec), allylamino (NHAll), tert-butylamino (NHtBu), diethylamino (NEt2), and anilino (NHPh) were synthesized and their reactions with phenylisocyanate were studied. In all cases of these silanes Me3SiNRR′ and Me2Si(NRR′)2 formal insertion of the –NCO group into their Si–N bonds was observed, i.e. formation of products with Si–N (rather than
achieved with LiNHR′ which allows the synthesis of mixed bisaminosilanes (R′HN)(R″HN)SiPh2. The X-ray structures of three of these compounds have been determined. There are no intermolecular N-H···N hydrogen bonds in these compounds in the solid state. Several 1,3,2,4-diazaphosphetidines have been synthesized using bis(N-lithioamino)silanes and bis(N-lithioamino)phosphanes . Amongst these the heterocycle
(O-silylcarbamates), i. e., compounds with the general motif R1R2N−CO−O−SiR3R4R5 as potential precursors. We focused on the insertion reaction of CO2 into Si−N bonds of substrates with cyclic (mostly aromatic) amine substituents, i. e., PhNHSiMe3, (PhNH)2SiMe2, PhCH2NHSiMe3, p-(MeO)C6H4NHSiMe3, o-C6H4(NHSiMe3)2, 1,2-C6H10(NHSiMe3)2, o-C6H4(NHSiMe3)(CH2NHSiMe3) and 1,8-C10H6(NHSiMe3)2. Compared to previously
一种新的无光气制备不同异氰酸酯的途径是从 CO 2和氨基硅烷(参见甲硅烷基胺)开始形成所谓的氨基甲酰氧基硅烷(O-甲硅烷基氨基甲酸酯),即。例如,具有通用基序R 1 R 2 N-CO-O-SiR 3 R 4 R 5作为潜在前体的化合物。我们专注于 CO 2插入具有环状(主要是芳香族)胺取代基的底物的 Si-N 键中的插入反应,即。例如,PhNHSiMe 3、(PhNH) 2 SiMe 2、PhCH 2 NHSiMe 3、p-(MeO)C 6 H 4 NHSiMe 3, oC 6 H 4 (NHSiMe 3 ) 2 , 1,2-C 6 H 10 (NHSiMe 3 ) 2 , oC 6 H 4 (NHSiMe 3 )(CH 2 NHSiMe 3 ) 和 1,8-C 10 H 6 (NHSiMe 3 ) 3)2。与之前研究的氨基硅烷相比,由于 N 原子的亲核性/碱性降低,这些反应受到阻碍。而略有增加的
Synthesis and Application of Some Dianilinosilanes, Bis (Trimethylsilyl) Phenylenediamines and Dialkyl Benzo-1,3,2-Diazasilolines as Antioxidants
作者:Hussein M. Ali、Mohamed A. M. El-Qurashi
DOI:10.1080/10426509808545493
日期:1998.2.1
A number of dialkyl or diphenyl dianilinosilanes, bis (trimethylsilyl) phenylenediamines and dialkyl benzo-1,3,2-diazasilolines were synthesized and used as antioxidants for lubricating base oils. Thermal analysis methods (DSC, TG and DTG) and IR technique were used to follow the oil oxidation. The first peak in the DSC thermograms of oil with the additive antioxidants is the sum of the endothermic