Polymethylhydrosiloxane
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Polymethylhydrosiloxane (PMHS) is a polymer with the general structure Template:Chem2. It is used in organic chemistry as a mild and stable reducing agent easily transferring hydrides to metal centers and a number of other reducible functional groups.[1][2] A variety of related materials are available under the following CAS registry numbers 9004-73-3, 16066-09-4, 63148-57-2, 178873-19-3. These include the tetramer (Template:Chem2), copolymers of dimethylsiloxane and methylhydrosiloxane, and trimethylsilyl terminated materials.
This material is prepared by the hydrolysis of monomethyldichlorosilane CAS#: 75-54-7:
The related polymer polydimethylsiloxane (PDMS) is made similarly, but lacking Template:Chem2 bonds, it exhibits no reducing properties. Dimethyldichlorosilane CAS#: 75-78-5 is then used instead of monomethyldichlorosilane CAS#: 75-54-7.
Illustrative of its use, PMHS is used for in situ conversion of tributyltin oxide to tributyltin hydride:[3]
References
- ↑ J. M. Lavis, R. E. Maleczka, Jr. "Polymethylhydrosiloxane" Encyclopedia of Reagents for Organic Synthesis 2003, John Wiley & Sons Script error: No such module "CS1 identifiers".
- ↑ Revunova, K., & Nikonov, G. I. (2014). Base-Catalyzed Hydrosilylation of Ketones and Esters and Insight into the Mechanism. Chemistry-a European Journal, 20(3), 839-845. Script error: No such module "CS1 identifiers".
- ↑ Script error: No such module "Citation/CS1"..
Further reading
- Larson, G. L.; Fry, J. L., "Ionic and organometallic-catalyzed organosilane reductions", Organic Reactions 2008, 71, 1-737. Script error: No such module "CS1 identifiers".