Claims
- 1. A process for the preparation of a mixture of tetraalkylsilanes, said process comprising contacting reactants (a), (b), and (c) at a reaction temperature, wherein:
- reactant (a) is an alkali metal aluminum tetraalkyl having the formula MAlR'.sub.4 wherein M is an alkali metal selected from the class consisting of lithium, sodium, and potassium, R' is an alkyl radical having from about 8 to about 14 carbon atoms, and the radicals depicted by R' are alike or different:
- reactant (b) is an alkylhalosilane having two halo groups per molecule selected from fluoride, chloride, and bromide, and each alkyl group having from 1 to about 4 carbon atoms; and
- reactant (c) is an olefin to which an alkyl radical R' corresponds, wherein R' has the same significance as above;
- such that the mole ratio of reactant (a) to reactant (b) is from about 0.5:1.0 to about 1:1, and the ratio of reactant (c) to reactant (a) is selected to confer in said product mixture of tetraalkylsilanes, the desired concentration of alkyl radicals derived from said olefin.
- 2. A process of claim 1, wherein said reaction temperature is from about 150.degree. C. to about 230.degree. C.
- 3. A process of claim 2, wherein said temperature is from about 180.degree. C. to about 230.degree. C.
- 4. A process of claim 1, wherein said alkali metal aluminum tetraalkyl has the formula NaAlR'.sub.4, wherein the 4 alkyl radicals represented by R' are the same.
- 5. The process of claim 4, wherein said alkali metal aluminum tetraalkyl is sodium aluminum tetraoctyl.
- 6. A process of claim 1, wherein said reactant (b) is methyltrichlorosilane.
- 7. A process of claim 1, wherein said reactant (b) is dimethyldichlorosilane.
- 8. A process of claim 1, wherein said reactant (c) is decene-1.
- 9. A process of claim 1, wherein said reactant (c) is a mixture of octene-1 and decene-1.
- 10. A process of claim 1, wherein about 0.75 mole of reactant (a) is employed for each mole of reactant (b), and per each mole of reactant (b) about 1.5 mole of reactant (c) is employed, such that the ratio of alkyl radicals in said product mixture of tetraalkylsilanes, derived from reactant (c) and reactant (a), is about 2:1.
- 11. A process for the preparation of a mixture of tetraalkylsilanes, said process comprising contacting reactants (a), (b), and (c) at a reaction temperature, wherein:
- reactant (a) is an alkali metal aluminum tetraalkyl having the formula MAlR'.sub.4 wherein M is an alkali metal selected from the class consisting of lithium, sodium, and potassium, R' is an alkyl radical having from about 8 to about 14 carbon atoms, and the radicals depicted by R' are alike or different;
- reactant (b) is an alkylhalosilane having two halo groups per molecule selected from fluoride, chloride, and bromide, and each alkyl group having from 1 to about 4 carbon atoms; and
- reactant (c) is an olefin to which an alkyl radical R' corresponds, wherein R' has the same significance as above;
- such that the mole ratio of reactant (a) to reactant (b) is from about 0.5:1.0 to about 1:1, and the ratio of reactant (c) to reactant (a) is selected to confer in said product mixture of tetraalkylsilanes, the desired concentration of alkyl radicals derived from said olefin.
- 12. A process of claim 11 wherein said reaction temperature is from about 150.degree. C. to about 230.degree. C.
- 13. A process of claim 12 wherein said temperature is from about 180.degree. C. to about 230.degree. C.
- 14. A process of claim 11, wherein said alkali metal aluminum tetraalkyl has the formula a NaAlR'.sub.4, wherein the 4 alkyl radicals represented by R' are the same.
- 15. A process of claim 14, wherein said alkali metal aluminum tetraalkyl is sodium aluminum tetraoctyl.
- 16. A process of claim 11, wherein said reactant (b) is dimethyldichlorosilane.
- 17. A process of claim 11, wherein said reactant (c) is decene-1.
- 18. A process of claim 11, wherein said reactant (c) is a mixture of octene-1 and decene-1.
- 19. A process of claim 11 wherein about 0.75 mole of reactant (a) is employed for each<mole of reactant (b), and per each mole of reactant (b) about 1.5 mole of reactant (c) is employed, such that the ratio of alkyl radicals in said product mixture of tetraalkylsilanes, derived from reactant (c) and reactant (a), is about 2:1.
- 20. A process of claim 1, wherein said alkali metal aluminum tetraalkyl is formed in situ.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PATENTS
This application is a continuation-in-part of application Ser. No. 198,514, filed May 24, 1988, now U.S. Pat. No. 4,916,245, and of application Ser. No. 129,001, filed Dec. 3, 1987, now U.S. Pat. No. 4,845,260, which in turn is a continuation-in-part of application Ser. No. 17,852, filed Feb. 24, 1987, now U.S. Pat. No. 4,711,965. This application is related to U.S. Pat. No. 4,711,966, which issued in my name on Dec. 8, 1987.
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Foreign Referenced Citations (2)
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825987 |
Dec 1959 |
GBX |
900132 |
Jul 1962 |
GBX |
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Ashby et al, Inorg. Chem. 2, No. 3, pp. 499-504 (1963). Zaharkin et al, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya No. 1, pp. 142-143 (Jan. 1966). |
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Related Publications (1)
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Date |
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129001 |
Dec 1987 |
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Continuation in Parts (2)
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198514 |
May 1988 |
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Parent |
17852 |
Feb 1987 |
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