Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Reexamination Certificate
2001-02-26
2002-12-03
Shaver, Paul F. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
C556S481000
Reexamination Certificate
active
06489501
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for forming at least one silicon-carbon bond in a silane.
Methyl chlorosilanes are typical starting materials used commercially in the manufacture of silicone polymers. Methyl chlorosilanes, comprising a silicon-carbon bond, are formed in a reaction between methyl chloride and elemental silicon, first disclosed by Rochow in 1945 in U.S. Pat. No. 2,380,995. However, the Rochow reaction relies on a costly energy consuming reduction of silicon dioxide to elemental silicon. Thus, there is a need for a method and apparatus for forming silicon-carbon bonds that avoids using the costly energy consuming reduction of silicon dioxide to elemental silicon.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a method for forming at least one product silane, comprising reacting a transition metal hydride with a starting silane in a presence of a catalyst and at a temperature that exceeds a threshold temperature associated with said reacting, wherein the starting silane has a chemical form of T
n
Si(OR)
(4−n)
, wherein the at least one product silane includes at least one silicon-carbon bond that is not present in the starting silane, wherein each T is independently a hydrogen atom or a monovalent hydrocarbon group, wherein each R independently includes a monovalent hydrocarbon group, and wherein n is an integer in a range between 0 and about 3.
In addition, the present invention provides a product silane having the chemical form of (R
m
)(T
n
)Si(OR)
(4−m−n)
, wherein each T independently includes a monovalent hydrocarbon group, wherein each R independently includes a hydrocarbon group, and wherein n is an integer in a range between 0 and about 3, wherein m is an integer in a range between about 1 and about 4−n, wherein the product silane is formed by the process of endothermically reacting a transition metal hydride with a starting silane in a presence of a catalyst and at a temperature that exceeds a threshold temperature associated with said reacting, and wherein the starting silane has a chemical form of (R
m−1
)(T
n
)Si(OR)
(5−m−n)
.
REFERENCES:
patent: 2380995 (1945-08-01), Rochow
patent: 6258971 (2001-07-01), Schattenmann
patent: 2332167 (1973-06-01), None
patent: 3821483 (1989-12-01), None
patent: 3821483 (1996-04-01), None
patent: 2013207 (1979-08-01), None
Bazan et al., “Organosilicon Compounds”, vol. 2, part 1, Academic Press, NY, 1965, pp. 105, 108, 109, 300, 305, 307.*
G.B. Goodwin, et al., Adv. Chem. Ser. 224-251 (1990).
A. Boudin et al., Organometallics 7, 1165-71 (1988).
A. Boudin et al., J. Organomet. Chem. 362, 265-72 (1989).
A. Boudin et al., Angew. Chem. Int. Ed. Engl. 25, 474 (1986).
Bennett Bernadette M.
General Electric Company
Johnson Noreen C.
Shaver Paul F.
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