Method for preparing organosilicon compounds
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsSatoshi Onodera, Makoto Yoshitake
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Abstract
A method for preparing organosilicon compounds comprises: 1) converting the Si-bonded alkoxy in an Si-bonded alkoxy-functional organosilicon compound to the diorganosilyl group by reacting the Si-bonded alkoxy-functional organosilicon compound with organodisiloxane with the general formula HR.sub.2 Si--O--SiR.sub.2 H, where R is a monovalent hydrocarbyl group of 1 to 10 carbon atoms, in alcohol-containing acidic aqueous solution; and subsequently 2) treating with a sulfonic acid catalyst and carboxylic acid. This method is able to convert all the alkoxy groups in the alkoxy-functional organosilicon compound to diorganosilyl. This method can be used to synthesize a high-purity carbosiloxane dendrimer having a narrow molecular weight distribution.
Claims18
A method for preparing organosilicon compounds, wherein the method comprises:
- 1) reacting a composition comprising
- i) a Si-bonded alkoxy-functional organosilicon compound,
- ii) an organodisiloxane having the general formula HR.sup.1.sub.2 Si--O--SiR.sup.1.sub.2 H, wherein R.sup.1 is a C.sub.1 to C.sub.10 monovalent hydrocarbyl group, and
- iii) an alcohol-containing acidic aqueous solution;
- and subsequently
- 2) treating the product of step 1) with a sulfonic acid catalyst and carboxylic acid.
A method for preparing a carbosiloxane dendrimer, wherein the method comprises:
- 1) repetitive and alternating execution of processes (A) and (B), wherein
- process (A) comprises synthesizing an Si-bonded alkoxy-functional organosilicon compound by an addition reaction between an SiH-functional organosilicon compound and alkenyltrialkoxysilane in the presence of a platinum transition metal catalyst, and
- process (B) comprises converting the Si-bonded alkoxy in the Si-bonded alkoxy-functional organosilicon compound afforded by process (A) to a diorganosilyl group having the formula --O--SiR.sup.1.sub.2 H(R.sup.1 =C.sub.1 to C.sub.10 monovalent hydrocarbyl) by reacting said Si-bonded alkoxy-functional organosilicon compound with organodisiloxane with the general formula HR.sup.1.sub.2 Si--O--SiR.sup.1.sub.2 H (R.sup.1 =C.sub.1 to C.sub.10 monovalent hydrocarbyl) in alcohol-containing acidic aqueous solution;
- and subsequently
- 2) treating the product of step 1) with a sulfonic acid catalyst and carboxylic acid.
Dependencies are inferred from the claim text.