Dimethyl chlorosilane

Thexyl dimethyl chlorosilane (dimethyl-[2,3-dimethyl-2-butyl1 chlorosilane) [67373-56-2] M 178.8, b 55-56 /10mm, 158-159°/720mm, d 0.970, 1.428. Purified by fractional... 

Vinyldialkylsilanes and vinyltrimethylsilane having no chlorine atoms do not undergo alkylation with benzene derivatives in the presenee of aluminum chloride but vinylchlorosilanes react with benzene to give the alkylation products. The reaetivities of vinylchlorosilanes decrease in the following order vinyl(methyl)di-chlorosilane > vinyltrichlorosilane > vinyl(dimethyl)chlorosilane. 

Thexyl dimethyl chlorosilane (dimethyl-[2,3-dimethyl-2-butyll chlorosilane) [67373-56-2] M 178.8, b 55-56°/10mm, 158-159 /720mm, d 0.970, n 1.428. Purified by fractional distillation and stored in small aliquots in sealed ampoules. It is very sensitive to moisture and is estimated by dissolving an aliquot in excess of O.IM NaOH and titrating with O.IM HCl using methyl red as indicator. [HCA 67 2128 1984]. 

The reactions were carried out in a 150 ml glass reactor equipped with a turbine stirrer and a reflux condenser. Product samples were withdrawn periodically and analysed by gas chromatography. The stationary phase used for analysis was 5% mixed cyano-propyl silicane Ibilar-b cp + Silar-7 cp) on chromosorb W (AW) treated with dimethyl chlorosilane (column length 1.1 meter). 

An effective route to O Si pentacoordinate silicon chelates consists of the reaction of chloromethyl(dimethyl)chlorosilane (ClCH2SiMe2Cl, 8) with a variety of N- or O-trimethylsilylamides, 5 lactams, ureas, 5... 

In the present paper, we will focus in a first step, on the results obtained using the same parent support (silica gel) modified by alkyl-dimethyl chlorosilanes of various alkyl chain length 1, 4, 8 and 18 carbon atoms. This material presents a disordered mesoporous texture [8]. 

Then, two MCM-41 materials modified by octyl-dimethyl chlorosilanes were tested. The parent MCM-41 matrices were synthesized by conventional route using hexadecyl-trimethylammonium bromide (sample MTS2) and octadecyl-trimethylammonium bromide (sample MTSl). They exhibit typical peaks of hexagonal ordered mesoporous materials in X-ray diffraction patterns. 

Tert-butyl dimethyl chlorosilane (TBDMS) could migrate between the close hydroxyl of the glucose unit under alkahne conditions. A novel method has been developed to prepare the target product base on the above properties. In doing so, the yield is also improved. The same method could be applied to produce 6-(3,6-di-0-methyl)-Q -CD and 7-(3,6-di-0-methyl)-/3-CD [6]. 

Dissolve jS-CD in pyridine. The pyridine solution which contains tert-butyl dimethyl chlorosilane (TBDMSCl) is dropped into the above y3-CD solution in an ice bath. The mixture should be maintained in the ice bath for 3 h before the reaction under room temperature for 12 h. The product should be precipitated by water. The yield is 83.5%. The crude product needs to be recrystallized in methanol [8]. 

Dimcthylphenylsilyl chloride (DMPSCl, chlorodimethylphenylsilane, phenyl dimethyl chlorosilane) [768-... 

The bulkier diphenyl methyl chlorosilane reacted with 0.79 silanol groups per Sii4029 unit of kenyaite [189]. During reaction with an allyl dimethyl chlorosilane, the allyl groups were eliminated, and SiOSi(CH3)2 OH groups were found in the interlaya- space [190]. 

Magadiite modified with octyl dimethyl chlorosilane intecalates long-chain alcohols with basal spacings that increase linearly with chain length ( = 6-12)... 

Silylation of dodecyltrimethylammonium magadiite with (2-perfluorohexyl-ethyl)dimethyl chlorosilane yields a material with increased thermal stability and film-forming ability [192],... 

Napthyl dimethyl (dimethylamino) silane (preparation). A10% solution of 1 equiv monochlorosilane (naphthyl dimethyl chlorosilane) in hexane (in benzene if necessary for solubility reasons) is stirred in a flask equipped with a reflux condenser cooled at -20 °C. From a communicating flask 2.2 equiv of dimethylamine vapour is slowly introduced over the solution and the mixture kept at room temperature overnight. After filtration and evaporation of the solvent, the residue is distilled. 

---