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Dimethyldichlorosilane is a tetrahedral organosilicon compound with the formula Si(CH 3) 2 Cl 2. At room temperature it is a colorless liquid that readily reacts with water to form both linear and cyclic Si-O chains. Dimethyldichlorosilane is made on an industrial scale as the principal precursor to dimethylsilicone and polysilane compounds.
This trend contrasts with the fact that Si is far less electronegative than carbon (1.90 vs 2.55, respectively). For Et 3 SiOH, the p K a is estimated at 13.6 vs. 19 for tert -butyl alcohol . The p K a of 3−ClC 6 H 4 )Si(CH 3 ) 2 OH is 11. [ 3 ]
The chemical formula of PDMS is CH 3 [Si(CH 3) 2 O] n Si(CH 3) 3, where n is the number of repeating monomer [Si(CH 3) 2 O] units. [4] Industrial synthesis can begin from dimethyldichlorosilane and water by the following net reaction: n Si(CH 3) 2 Cl 2 + (n+1) H 2 O → HO[Si(CH 3) 2 O] n H + 2n HCl. The polymerization reaction evolves ...
The heat of evaporation is 45.64 kJ·mol −1, the evaporation entropy 123 J·K −1 ·mol −1. [2] The vapor pressure function according to Antoine is obtained as log 10 (P/1 bar) = A − B/(T + C) (P in bar, T in K) with A = 5.44591, B = 1767.766 K and C = −44.888 K in a temperature range from 291 K to 358 K. [ 2 ] Below the melting point ...
2 CH 3 Cl + Si → (CH 3) 4−n SiCl n + other products While this reaction is the standard in industrial silicone production and is nearly identical to the first direct synthesis of methyltrichlorosilane, the overall process is inefficient with respect to methyltrichlorosilane. [ 2 ]
rn(si(ch 3) 3) 2 + h 2 o → o(si(ch 3) 3) 2 + rnh 2 where X is a halogen and R is an alkyl . This method has been extended to aminomethylation via the reagent CH 3 OCH 2 N(Si(CH 3 ) 3 ) 2 , which contains a displaceable methoxy group CH 3 O –.
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%).
2 Me 3 SiCl + H 2 O → 2 HCl + O[Si(CH 3) 3] 2. It also results from the hydrolysis of silyl ethers and other silyl-protected functional groups. HMDSO can be converted back to the chloride by reaction with Me 2 SiCl 2. [3] Hexamethyldisiloxane is mainly used as source of the trimethylsilyl functional group (-Si(CH 3) 3) in organic synthesis.