Tetraalkylsilane synthetic fluids

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with an oxygenated, platinum-containing catalyst selected from the group consisting of (i) a platinum catalyst having a basicity substantially equal to or less than that provided by a platinum-containing catalyst having a triphenylphosphine ligand, or (ii) a heterogeneous platinum-containing catalyst, under hydrosilylation conditions, cooling the reaction mixture to room temperature prior to complete conversion of said alkylsilane to a tetraalkylsilane, contacting said catalyst with an oxygen-containing gas, and heating said reaction mixture back to hydrosilylation conditions for substantially complete conversion to a tetraalkylsilane.

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with a platinum-containing catalyst selected from the group consisting of (i) a platinum catalyst having a basicity substantially equal to or less than that provided by a platinum-containing catalyst having a triphenylphosphine ligand, or (ii) a heterogeneous platinum-containing catalyst, under hydrosilylation conditions, and thereafter activating said catalyst by contacting said catalyst with an oxygen-containing gas.

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with a platinum-containing catalyst selected from the group consisting of (i) a platinum catalyst having a basicity substantially equal to or less than that provided by a platinum-containing catalyst having a triphenylphosphine ligand, or (ii) a heterogeneous platinum-containing catalyst, under hydrosilylation conditions, and thereafter activating said catalyst by contacting said catalyst with an oxygen-containing gas, cooling the reaction mixture to ambient conditions, bubbling air into contact with said catalyst, and thereafter heating the reaction mixture until said alkylsilane is substantially completely converted.

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with a platinum-containing catalyst selected from the group consisting of (i) a platinum catalyst having a basicity substantially equal to or less than that provided by a platinum-containing catalyst having a triphenylphosphine ligand, or (ii) a heterogeneous platinum-containing catalyst, under hydrosilylation conditions, and thereafter activing said catalyst by contacting said catalyst with an oxygen-containing gas, cooling the reaction mixture to room temperature prior to complete conversion of the alkylsilane, contacting said catalyst with an oxygen-containing gas, thereafter heating said reaction mixture back to hydrosilylation reaction conditions for substantially complete conversion to a tetraalkylsilane.

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with a platinum dioxide catalyst under hydrosilylation conditions.

A process for the production of tetraalkylsilane compounds which comprises contacting an admixture comprising

• (A) at least one alkylsilane selected from the group consisting of
• (i) a monoalkylsilane having the formula
• R--Si--H.sub.3,
• (ii) a dialkylsilane having the formula
• R--SiH.sub.2 --R.sub.1,
• (iii) a trialkylsilane having the formula
• R--SiH--(R.sub.1).sub.2,
• and mixtures thereof, wherein R and R.sub.1 each represent an alkyl radical of from one to 20 carbon atoms per molecule, and
• (B) at least one alpha olefin containing from two to about 20 carbon atoms per molecule, under an inert atmosphere with a platinum dioxide catalyst under hydrosilylation conditions, cooling the reaction mixture to room temperature prior to complete conversion of said alkylsilane, contacting said catalyst with an oxygen-containing gas, and thereafter heating to said reaction mixture back to hydrosilylation reaction conditions for substantially complete conversion to a tetraalkylsilane.