Silicone condensation reaction
View Patent ↗A new silicone condensation reaction, the condensation between an alkoxy silane or siloxane or a dihydric phenol and an organo-hydrosilane or siloxane and catalysts therefore is described and claimed.
1. A process for forming a silicon to oxygen bond comprising:
a) reacting a first silicon containing compound said first silicon containing compound comprising a hydrogen atom directly bonded to a silicon atom with
i) at least one compound comprising oxygen, said compound selected from the group consisting of alcohol, ester, aldehyde, ether, carbonate and combinations and mixtures thereof and
ii) a Lewis acid catalyst,
thereby forming a second silicon containing compound, said second silicon containing compound comprising an alkoxy group bonded to a silicon atom; and
b) reacting the formed second silicon containing compound comprising an alkoxy group bonded to a silicon atom with the residual first silicon containing compound thereby forming a silicon to oxygen bond, and
wherein said process is stabilized by the addition of a compound selected from the group consisting of ammonia, primary amines, secondary amines, tertiary amine and organophosphines.
2. The process of claim 1 wherein the Lewis acid catalyst comprises a compound of the formula:
MR 12 x X y
wherein M is selected from the group consisting of B, Al, Ga, In and Tl; each R 12 is independently selected from the group of monovalent aromatic hydrocarbon radicals having from 6 to 14 carbon atoms; X is a halogen atom selected from the group consisting of F, Cl, Br, and I; x is 1, 2, or 3; and y is 0, 1 or 2; subject to the requirement that x+y=3.
3. The process of claim 2 where M is boron.
4. The process claim 2 wherein each R 12 is C 6 F 5 and x=3.
5. The process of claim 1 wherein said process is activated by heat.
6. A process for forming a silicon to oxygen bond comprising:
a) reacting a first silicon containing compound said first silicon containing compound comprising a hydrogen atom directly bonded to a silicon atom with
i) at least one compound comprising oxygen, said compound selected from the group consisting of alcohol, ester, aldehyde, ether, carbonate and combinations and mixtures thereof and
ii) a Lewis acid catalyst, thereby forming a second silicon containing compound, said second silicon containing compound comprising an alkoxy group bonded to a silicon atom; and
b) reacting the formed second silicon containing compound comprising an alkoxy group bonded to a silicon atom with the residual first silicon containing compound thereby forming a silicon to oxygen bond, and
wherein the compound comprising oxygen is an ether.
7. The process of claim 6 wherein the ether is diethylether.
8. A process for forming a silicon to oxygen bond comprising:
a) reacting a first silicon containing compound said first silicon containing compound comprising a hydrogen atom directly bonded to a silicon atom with
i) at least one compound comprising oxygen, said compound selected from the group consisting of alcohol, ester, aldehyde, ether, carbonate and combinations and mixtures thereof and
ii) a Lewis acid catalyst having the formula B(C 6 F 5 ) 3 , thereby forming a second silicon containing compound, said second silicon containing compound comprising an alkoxy group bonded to a silicon atom; and
b) reacting the formed second silicon containing compound comprising an alkoxy group bonded to a silicon atom with the residual first silicon containing compound thereby forming a silicon to oxygen bond, and
wherein the compound comprising oxygen is an ether.