Process for the manufacture of hydrogen-rich cyclosiloxane

Details Process for the manufacture of hydrogen-rich cyclosiloxane Process for the manufacture of hydrogen-rich cyclosiloxane

2007-04-19

2010-02-02

King, Roy (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S324000

Reexamination Certificate

active

07655206

ABSTRACT:
The present invention relates to a for controlled synthesis of hydrogen-rich cyclosiloxanes of the (H2SiO)ntype.where n is an integer equal to or greater than 3, by reacting:a.) a halosilane of the H2SiX2type where X=halogen withb.) a lithium salt, copper(II) salt or a salt of a metal from main group 2 or transition group 2 of the periodic table of the elements, or a mixture of these salts.The ring size is advantageously adjustable to n=3, 4, 5, 6 (especially n=4 to 6), such that larger rings are not formed.In a particularly advantageous embodiment of the process, for the selective preparation of cyclohexasiloxane (H2SiO)6, after the reaction, the solvent is at least partly removed and then solvent is added again.

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Seyferth et al, Cyclic Polysiloxanes from the Hydrolysis of Dichlorosilane, 1983, 22, 2163-2167.
Seyferth et al (“Cyclic Polysiloxanes from the Hydrolysis of Dichlorosilane”, Journal of Inorganic Chemistry, 22, 1983, p. 2163-2167).
Seyferth, Dietmar et al., “Cyclic Polysiloxanes from the Hydrolysis of Dichlorosilane”, Inorg. Chem., vol. 22, No. 15, pp. 2163-2167, XP 002444114, (1983).
U.S. Appl. No. 10/584,446, filed Jun. 22, 2006, Bohmhammel, et al.

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