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(Poly(methylhydrosiloxane))

(Poly(methylhydrosiloxane))

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Room 5-316, QingHeLiTing, AnDong Road, TunXi district, HuangShan city, AnHui Province, China, Huangshan, Anhui

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Description

Polymethylhydrosiloxane (PMHS) is a polymer with the general structure -(CH3(H)Si-O)-. It is used in organic chemistry as a mild and stable reducing agent easily transferring hydrides to metal centers.[1] A variety of related materials are available under the following CAS registry numbers ********3, *********4, *********2, **********3. These include the tetramer ((MeSiHO)4), copolymers of dimethysiloxane and methylhydrosiloxane, and trimethylsilyl terminated materials.
 

This material is prepared by the hydrolysis of methyldichlorosilane:

n MeSiHCl2 + n H2O → (MeSiHO)n + 2n HCl

The related polymer polydimethylsiloxane (PDMS) is made similarly, but lacking Si-H bonds, it exhibits no reducing properties.

Illustrative of its use, PMHS is used for in situ conversion of tributyltin oxide to tributyltin hydride:[2]

2"(MeSiH)" + (Bu3Sn)2O → "(Me2Si2O" + 2 Bu3SnH

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