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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 and a number of other reducible functional groups. 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 ((MeSiHO)4), copolymers of dimethylsiloxane and methylhydrosiloxane, and trimethylsilyl terminated materials. This material is prepared by the hydrolysis of methyldichlorosilane:

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  • Polymethylhydrosiloxane
  • Polyméthylhydrosiloxane
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  • Le polyméthylhydrosiloxane, ou PMHS, est un polymère de structure générale –[–SiHCH3–O–]–. Il est utilisé en chimie organique comme réducteur doux et stable susceptible de transférer facilement des hydrures sur des centres métalliques et divers autres groupes fonctionnels réducteurs. Diverses substances existent sous les numéros CAS 9004-73-3, 16066-09-4, 63148-57-2 et 178873-19-3, dont des copolymères de diméthylsiloxane [–Si(CH3)2–O–] et de méthylhydrosiloxane [–SiHCH3–O–], ainsi que des molécules à terminaison triméthylsilyle –Si(CH3)3. n CH3SiHCl2 + n H2O ⟶ [–SiHCH3–O–]n + 2n HCl.
  • 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 and a number of other reducible functional groups. 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 ((MeSiHO)4), copolymers of dimethylsiloxane and methylhydrosiloxane, and trimethylsilyl terminated materials. This material is prepared by the hydrolysis of methyldichlorosilane:
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  • Methyl hydrogen siloxane; Poly; Poly; Polysilicone 4
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  • Le polyméthylhydrosiloxane, ou PMHS, est un polymère de structure générale –[–SiHCH3–O–]–. Il est utilisé en chimie organique comme réducteur doux et stable susceptible de transférer facilement des hydrures sur des centres métalliques et divers autres groupes fonctionnels réducteurs. Diverses substances existent sous les numéros CAS 9004-73-3, 16066-09-4, 63148-57-2 et 178873-19-3, dont des copolymères de diméthylsiloxane [–Si(CH3)2–O–] et de méthylhydrosiloxane [–SiHCH3–O–], ainsi que des molécules à terminaison triméthylsilyle –Si(CH3)3. On obtient du polyméthylhydrosiloxane par hydrolyse du méthyldichlorosilane CH3SiHCl2 : n CH3SiHCl2 + n H2O ⟶ [–SiHCH3–O–]n + 2n HCl. Le polydiméthylsiloxane (PDMS) est dépourvu de liaisons Si–H de sorte qu'il ne présente pas de propriétés réductrices. Le polyméthylhydrosiloxane est utilisé pour la conversion in situ de l'oxyde de tributylétain (C4H9)3Sn–O–Sn(C4H9)3 en hydrure de tributylétain (n-C4H9)3Sn–H.
  • 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 and a number of other reducible functional groups. 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 ((MeSiHO)4), copolymers of dimethylsiloxane 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"(MeSiH)" + (Bu3Sn)2O → "Me2Si2O" + 2 Bu3SnH
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  • Methyl hydrogen siloxane; Poly(methyl siloxane); Poly(methylhydrosiloxane); Polysilicone 4
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