US 7,456,308 B2
	Grignard processes with improved yields of diphenylchlorosilanes as products
Binh Thanh Nguyen, Midland, Mich. (US); Curtis John Bedbury, Midland, Mich. (US); Roger Edwin Humburg, Midland, Mich. (US); Susan Mary Jacob, Midland, Mich. (US); Sarah Jane Ratcliff, Midland, Mich. (US); and John Dennis Waterman, Coleman, Mich. (US)
Assigned to Dow Corning Corporation, Midland, Mich. (US)
Appl. No. 10/585,154 PCT Filed Dec. 17, 2004, PCT No. PCT/US2004/043005 § 371(c)(1), (2), (4) Date Jun. 29, 2006, PCT Pub. No. WO2005/068475, PCT Pub. Date Jul. 28, 2005.
Claims priority of provisional application 60/534443, filed on Jan. 06, 2004.
Prior Publication US 2007/0066826 A1, Mar. 22, 2007
This patent is subject to a terminal disclaimer.
Int. Cl. C07F 7/04 (2006.01)

U.S. Cl. 556—480  [546/14]

4 Claims

1. A process for preparing diphenylchlorosilanes by the Grignard process comprising contacting a phenyl Grignard reagent, an ether solvent, a trichlorosilane selected from the group consisting of methyltrichlorosilane, phenyltrichlorosilane, and vinyltrichlorosilane, a phenylchlorosilane selected from the group consisting of phenylmethyldichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane, phenylvinyldichlorosilane, and toluene; wherein the mole ratio of the ether solvent to the phenyl Grignard reagent is 2 to 5, the mole ratio of the trichlorosilane to the phenyl Grignard reagent is 0.1 to 10, the mole ratio of the phenylchlorosilane to the phenyl Grignard reagent is 0.5 to 5, and the mole ratio of toluene to the phenyl Grignard reagent is 3 to 7.