Dow Corning Corporation

Dow Silicones Corporation

Wendy Sparschu

Dimitris Katsoulis

Matthew J McLaughlin

Robert Thomas Larsen

Robert Morgan

Aswini K Dash

Aswini Dash

A method for preparing a reaction product including an aryl-functional silane includes sequential steps (1) and (2). Step (1) is contacting, under silicon deposition conditions, (A) an ingredient including (I) a halosilane such as silicon tetrahalide and optionally (II) hydrogen (H); and (B) a metal combination comprising copper (Cu) and at least one other metal, where the at least one other metal is selected from the group consisting of gold (Au), cobalt (Co), chromium (Cr), iron (Fe), magnesium (Mg), manganese (Mn), nickel (Ni), palladium (Pd), and silver (Ag); thereby forming a silicon alloy catalyst comprising Si, Cu and the at least one other metal. Step (2) is contacting the silicon alloy catalyst and (C) a reactant including an aryl halide under silicon etching conditions.

Method for producing aryl-functional silanes

A method comprises separate and consecutive steps (i) and (ii). Step (i) includes contacting a copper catalyst with hydrogen gas and a halogenated silane monomer at a temperature of 500&#xb0; C. to 1400&#xb0; C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon. Step (ii) includes contacting the silicon-containing copper catalyst with an organohalide at a temperature of 100&#xb0; C. to 600&#xb0; C. to form a reaction product. The organohalide has formula HCX, where X is a halogen atom, subscript a is an integer of 0 or more, subscript b is an integer of 1 or more, and subscript c is an integer of 2 or more. The method produces a reaction product. The reaction product includes a halogenated silahydrocarbylene.

Method of preparing halogenated silahydrocarbylenes

A method of preparing a diorganodihalosilane, the method comprising the following separate and consecutive steps: (a) treating a metal catalyst comprising a metal selected from the groups consisting of i) gold, ii) gold and copper, iii) gold, copper and magnesium, iv) copper, rhodium and gold, v) copper, rhodium, and rhenium, vi) rhenium and palladium, vii) copper, and viii) copper and magnesium with a mixture comprising hydrogen gas and an organotrihalosilane at a temperature from 500 to 1400&#xb0; C. to form a silicon-containing metal intermediate; and (b) reacting the silicon-containing metal intermediate with an organohalide according to the formula RX, wherein R is C-Chydrocarbyl and X is halo, at a temperature from 100 to 600&#xb0; C. to form a diorganodihalosilane and a depleted silicon-containing metal intermediate.

Method for preparing a diorganodihalosilane

A reaction product is formed utilizing a method that includes the step of combining a metal silicide and an aliphatic hydrocarbyl halide at a temperature of from 200&#xb0; C. to 600&#xb0; C. The aliphatic hydrocarbyl halide has the formula HCX, wherein a is 0 or more, b is 1 or more, c is one or more, and X is halo. The method allows the reaction product to be formed in a predictable and controlled manner. Moreover, the components used in this method can be easily recycled and/or re-used in other processes.

Method of selectively forming a reaction product in the presence of a metal silicide

A method of preparing a trihalosilane comprising the separate and consecutive steps of (i) contacting a copper catalyst with hydrogen gas and a silicon tetrahalide at a temperature of from 500 to 1400&#xb0; C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon, wherein the copper catalyst comprises a metal selected from copper and a mixture comprising copper and at least one element selected from gold, magnesium, and platinum; and (ii) contacting the silicon-containing copper catalyst with a hydrogen halide at a temperature of from 100 to 600&#xb0; C. to form a trihalosilane.

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Bay City, MI, United States of America

Wendy Sparschu