Method for preparing an ω-haloalkyl dialkylhalosilane

Details Method for preparing an ω-haloalkyl dialkylhalosilane Method for preparing an ω-haloalkyl dialkylhalosilane

2005-06-14

2010-06-22

Parsa, Jafar (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C556S466000, C556S479000

Reexamination Certificate

active

07741504

ABSTRACT:
The present invention relates to a method for preparing an omega-haloalkyl dialkylhalosilane by means of a hydrosilylation reaction in the presence of a catalytically effective amount of a hydrosilylation catalyst containing a platinum group metal. The catalytic metal is recovered by (i) subjecting the distillation residue to controlled hydrolysis to release the gaseous H-Hal haloacid, and providing an aqueous medium containing the catalytic metal with a low hydrolysable halide content Si-Hal=2%, expressed by weight of Hal, then (2i) recovering the platinum group catalytic metal from said aqueous medium by means of one of the conventional techniques specific to catalyst manufacturers that do not use a solid adsorbent and operate in ordinary facilities that do not have to be acid-resistant.

REFERENCES:
patent: 6388119 (2002-05-01), Bauer et al.
patent: 7307180 (2007-12-01), Guennouni et al.
patent: 1156052 (2001-11-01), None
patent: 2843392 (2004-02-01), None
patent: WO 03/048169 (2003-06-01), None
Aoki et al., {Immobilization of chiral phosphine ligands on silica gel by means of the allylsilane method and their use for catalytic asymmetric reactions, Tetrahedron: Asymmetry (2004), 15(11), 1771-1777}.

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