2-diphenyl- silane

Apart from methylphenyldichlorosilane, the reaction also yields some methyldiphenyldichlorosilane, diphenyl, diphenylbenzene and other substances. The product is distilled in vacuum distilling tank 13, separating several distillates distillate I (up to 135 °C) contains a small quantity of the main product, unreacted methyltrichlorosilane and chlorobenzene, as well as xylene distillate II (up to 180 °C) always contains small quantities of the main product and xylene distillate III (180-300°C) generally contains the main product — methylphenyldichlorosilane distillate IV (more than 300°C) is usually separated under a residual pressure of 20 GPa and vapour temperature of 140 °C and is a mixture of methyldiphenylchloro-silane, diphenyl, diphenylbenzene and other impurities. To obtain pure methylphenyldichlorosilane, the products of distillation are subsequently rectified. 

CAS 775-12-2 EINECS/ELINCS 212-271-0 Synonyms Silane, diphenyl-Empirical Ci2Hi2Si... 

Benzhydryloxy ethoxy diphenyl silane (2). To a solution of benzoyl triphenylsilane 1 (2.5 g, 6 9 mmol) in benzene (25 mL) was added a solution of sodium ethoxide in ethanol (2 mL, 0 S mmol). The solution changed colour and after 11 min laded airmst completely. The solution was washed with water and the solvent removed in vacuum. The oily residue was dissolved in hot ethanol (15 mL) and cooled to give 2 (2 1 g, 74%), np 67-75 C Recrystallizatlon from ethanol gave 1 8 g (64%). mp 77-78,C... 

Similarly, examples of barriers arising largely from simple steric hindrance can be found, as for instance in the hindered diphenyls.35 On the other hand there are many arguments suggesting that this is not the important force in ethane and similar molecules. It would be difficult to understand the relatively slow fall in barrier from ethane to methyl silane to methyl germane on a van der Waals repulsion basis. Furthermore, the small effect of substituting F, Cl, or Br on one end would also seem mysterious. The equilibrium orientation in propylene is opposite to the predictions of one of the quantitative van der Waals theories. Finally, the apparently small effect of bending back the C—H bonds is not in accord with either the electrostatic or van der Waals pictures. 

Dagegen werden mit Triathyl-silan/Bortrifluorid (s.S. 412) gesattigte Kohlenwasser-stoffe erhalten. Allerdings ist die Reaktionsgeschwindigkeit stark strukturabhangig. So erhalt man z.B. aus 1,2-Epoxy-cyclohexan bei 20° erst nach mehreren Wochen Cyclohexan und aus 2,3-Diphenyl-oxiran innerhalb einer Woche bei 20° quantitativ l, 2-Diphenyl-dthan5. 

Dichlor-diphenyl-silan und -german werden in 1,2-Dimethoxy-athan an Quecksilber (get. Zelle) zu Diphenyl-silan bzw. -german reduziert2 ... 

The alkylation of benzene with ((w,a -dichloroalkyl)silanes was also studied in the presence of aluminum chloride catalyst. The alkylation gave diphenylated products, (w.w-diphenylalkyl)chlorosilanes in fair to good yields (Eq. (12)). 

In the alkylation of benzene with (dichloroalkyl)chlorosilanes in the presence of aluminum chloride catalyst, the reactivity of (dichloroalkyl)silanes increases as the spacer length between the C—Cl and silicon and as the number of chloro-groups on the silicon of (dichloroalkyl)chlorosilanes decreases as similarly observed in the alkylation with (cD-chloroalkyl)silanes. The alkylation of benzene derivatives with other (dichloroalkyl)chlorosilanes in the presence of aluminum chloride gave the corresponding diphenylated products in moderate yields.Those synthetic data are summarized in Table XI. 

A similar dichotomy was observed in the titanium catalyzed polymerization of primary silanes coupled to the hydrogenation of norbornene (20). At low catalyst concentration (ca. 0.004H), essentially complete conversion of norbornene to an equimolar mixture of norbornane and bis-phenylsilyl- (and/or 1,2-diphenyl-disilyl)norbornane was observed. Under these conditions no evidence for reduction of titanium was obtained. At higher catalyst concentrations (> 0.02M) rapid reduction of the dimethyltitanocene to J, and 2 occurs and the catalytic reaction produces mainly polysilane (DPn ca. 10) and norbornane in ca. 80 per cent yields, and silylated norbornanes in about 20 per cent yield. 

The limits of the original BIRD-FIMBC sequence and the excellent /ci 1 filter quality of the double tuned G-BIRD element is exemplified in the spectra obtained with the molecule 1,3-butadiynyl (ferf-butyl) diphenyl-silane (Figure 6). This molecule provides a stringent test, since it contains all together aliphatic, aromatic and acetylenic protons, and the corresponding ch coupling constant values vary from 125 to 260 Flz. 

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