Amino compounds silanes

Treatment of water-washed hard china clays with silanes with pendant amino or mercapto groups enables them to give improved reinforcement to rubber compounds. Silane-treated clays give compounds with lower viscosity, considerably higher modulus and tensile strength and lower compression set than compounds containing untreated clays. 

A typical embodiment for the porous layer technology is described in several patents and patent applications, e.g., a US patent application in 2006. This patent application describes a method for the preparation of silicon dioxide dispersions wherein the surface of the silicon dioxide is modified by treatment with the reaction products of a compound of trivalent aluminum with amino-organo-silane. The invention relates to recording sheets for inkjet printing having such a dispersion incorporated in the porous inkreceiving layer. Another US patent describes the preparation of nanoporous alumina oxide or hydroxide which contains at least one element of the rare earth metal series with atomic numbers 57 to 71. 

The versatility of lithium aluminum hydride permits synthesis of alkyl, alkenyl, and arylsilanes. Silanes containing functional groups, such as chloro, amino, and alkoxyl in the organic substituents, can also be prepared. Mixed compounds containing both SiCl and SiH cannot be prepared from organopolyhalosilanes using lithium aluminum hydride. Reduction is invariably complete. 

Wise SA, Chesisr SN, Hertz HS, Hilpert LR, and May WE (1977) A chemically bonded amino-silane stationary phase for the high-performance liquid chromatographic separation of polynuclear aromatic compounds. Anal Chem 49 2306-2310. 

The ring-opening of the cyclopropane nitrosourea 233 with silver trifiate followed by stereospecific [4 + 2] cycloaddition yields 234 [129]. (Scheme 93) Oxovanadium(V) compounds, VO(OR)X2, are revealed to be Lewis acids with one-electron oxidation capability. These properties permit versatile oxidative transformations of carbonyl and organosilicon compounds as exemplified by ring-opening oxygenation of cyclic ketones [130], dehydrogenative aroma-tization of 2-eyclohexen-l-ones [131], allylic oxidation of oc,/ -unsaturated carbonyl compounds [132], decarboxylative oxidation of a-amino acids [133], oxidative desilylation of silyl enol ethers [134], allylic silanes, and benzylic silanes [135]. 

The compounds I and II represent intermediates for the synthesis of either carboxy functional or amino functional polysiloxanes. To this end I or II is either saponified with sodium hydroxide and concomitantly polycon-densated to a poly(carboxylaIky1 methyl siloxane) (III) or reduced to an amino alkyl methyl dialkoxy silane with sodium borohydride (J 5). ... 

Reaction of Cl3SiC6H2-2,4,6-Ph3 with ammonia affords the tris(amino)-silane compound (H2N)3SiC6H2-2,4,6-Ph3 in 71% yield [Eq. 9]." The X-ray crystal structure was the first for a species in which three NH2 groups were bound to one silicon atom. There is pyramidal geometry at the nitrogen atoms. The structural characterization of a series of such Si-NH2 compounds led to the conclusion that N — Si p-d 77-overlap was not significant in the Si-N bonding.99... 

In addition to the dihydro compounds discussed above, the triethylsilane/trifluoroacetic acid reduction system can also be used to prepare tetrahydro pyrimidine derivatives, especially when dichloromethane is used as the solvent <2004TL2107>. Thus, treatment of 2-amino-5-phenylpyrimidine 398 with 2.5 equiv of triethylsilane and 5 equiv of TEA in dichloromethane at room temperature gave a quantitative yield of the tetrahydro derivative 399, whereas only a dihydro derivative was obtained with 10 equiv of the silane in the absence of dichloromethane <2004TL2107>. 

So far there has been little use in the volume thermoplastics such as PVC and polyolefins. The main exception would seem to be the use of amino-silane treated glass in conjunction with maleated polypropylene in polypropylene compounds. 

The principal use of calcined clay in thermoplastics is in polyamide moulding compounds, for which purpose it is normally coated with an amino functional organo-silane. 

However, a second component shifted to higher binding energy was observed for thin films of the compound adsorbed onto aluminum that had been cleaned by ion bombardment and then exposed to oxygen. Finally, Linde [18] has suggested that polyamic acids of pyromellitic dianhydride and oxydianiline do not react with films formed by y-APS adsorbed onto metal substrates such as aluminum and chromium because the silane is adsorbed through the amino groups. 

An amino-functional spacer arm is introduced at the 5 position of the ODN in the last step of its automated synthesis. ODN can be grafted via various functions available on flat carriers (such as flat silicon surfaces or wafers covered in silane) or on latex particles. Table 2 shows a list of various activation agents used and the reactive group resulting from the activation depending on the compound involved when available, the maximum grafting amount is also reported. 

The trilithium derivatives of tris(amino)silanes, synthesized so far, all have a dimeric structure [1-5]. By treating the tris(amino)silane with three equivalents of BuLi in THF, however, we obtained colorless cystals of the monomeric trilithium compound (Fig. 1,1). 

MeO)3SiH and LiOMe. Controlling temperature and solvent leads to different ratios of syn- and anti- products.Silanes reduce ketones in the presence of BF3 OEt2 °° and transition-metal compounds catalyze this reduction. Ketones are reduced with Cl3SiH in the presence of pyrrolidine carboxaldehyde °° or under photochemical conditions.Polymethylhy-drosiloxane with tetrabutylammonium fluoride reduces ot-amino ketones to give the syn-amino alcohol. 

Summary Treatment of geminal silyldiamines with monohalo silanes leads to the formation of 1-amino-1,3-disilazanes. Mono-NH-SiF-functional cyclodisilazanes can be isolated by ring closure of their lithium derivatives in the reaction with trifluorosilanes. Lithium salts of these cyclodisilazanes react with H-acidic compounds like alcohols as amides and with unsaturated compounds like aldehydes as silaimines. 

The highly reactive silyl ttiflates and silyl bis(triflates) are obtained by reaction of the corresponding aminosilanes with triflic acid in diethylether as shown in Schemes 1 and 2 [12]. The substitution patterns at the silicon atoms are variable. Functional substituted silanes, e.g., vinyl, allyl, or hydrogen derivatives can also be obtained. (Diethylamino)diphenylsilyllithium is formed from (diethylamino)diphenylchlorosilane with lithium in THF. Yields of both reactions are high (90-95%). The products can be used for following reaction without further purification. Silyl triflates and (aminosilyl)lithium compounds react to give the amino-substituted trisilanes la - Ic (Scheme 1). 

Many chiral derivatization reactions were used and the compounds examined are mostly amphetamines, /3-blocking agents, amino adds, and anti-inflammatory drugs. Silica gel and, to a lesser extent, silanized silica were used as stationary phases. The Rf values obtained for the diastereomeric pairs were not usually very high (0.04 -0.07), with the exception of amino alcohol and amino acid diastereomers obtained with Marphey s reagent, a derivative of L-alanine amide (0.06 - 0.22). 

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