Process for selective monoaddition to silanes containing two sil

Details Process for selective monoaddition to silanes containing two sil Process for selective monoaddition to silanes containing two sil

1992-12-21

1996-01-16

Shaver, Paul F.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

556449, 556434, 556415, 556439, 556436, 556425, 556428, 556445, C07D30302, C07F 708, C07F 710, C07F 718

Patent

active

054849500

ABSTRACT:
A process for the selective monoadditon of an olefin or acetylene to a siloxane which contains two reactive Si--H bonds to produce a product in which only one of the two Si--H functions has added across the olefin or acetylene is disclosed. A process for making unsymmetrical siloxanes from symmetrical dihydrosiloxanes and products of both of these processes are also disclosed. Products are represented by the formula I in which R.sup.1 and R.sup.4 are different: ##STR1##

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"(PPh.sub.3).sub.3 RhCl-Catalyzed Hydrosilylation of Unsaturated Molecules by 1,2Bis (dimethylsilyl)ethane: Unprecedented Rate Difference Between Two Si-H Bonds" Nagashima et al. Organometallics 8, 2495-2496 (1989).

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