Polymethylhydrosiloxane

• Post Date:

  Dec 02,2015

• Expiry Date:

  May 30,2016

• Detailed Description:

  Cas No. :9004-73-3 Specs:98%min
  Payment Method: T/T,L/C,O/A.
  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.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 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"(MeSiH)" + (Bu3Sn)2O → "(Me2Si2O" + 2 Bu3SnH
  Polymethylhydrosiloxane
  Names
  Other names
  Methyl hydrogen siloxane; Poly(methyl siloxane); Poly(methylhydrosiloxane); Polysilicone 4
  Properties
  Chemical formula (CH3(H)SiO)n
  
  Product Name:Polymethylhydrosiloxane
  Synonyms:METHYLHYDROGENSILOXAN POLYMER;PMHS;POLYMETHYLHYDROSILOXANES;POLYMETHYLHYDROSILOXANE, TRIMETHYLSILYL TERMINATED;Methyl hydrogen polysiloxane~PMHS;METHYLPOLYSILOXANEOIL;Poly[oxy(methylsilylene)];Polymethylhydrosiloxane
  CAS:9004-73-3
  MF:(CH3)3SiO[(CH3)HSiO] nSi(CH3)
  MW:0
  EINECS:
  bp >177 °C(lit.)
  density 1.006 g/mL at 25 °C(lit.)
  refractive index n20/D 1.398
  Fp 250 °F
  Water Solubility PRACTICALLY INSOLUBLE
  Sensitive Moisture Sensitive

• CAS Registry Number:

  9004-73-3

• Synonyms:

  ;Poly(dimethylsiloxane-co-methylhydrosiloxane);Methyl Hydrogen Silicone Fluid;Poly(methylhydrosiloxane);Methylhydro-silicone oil;PMHS;Trimethylsiloxy terminatedpolymethyhydrosiloxane;Methyl hydro-silicone oil;Polymethylhydrosiloxane, Trimethylsiloxy Terminated;

• Molecular Formula:

  C₃H₉OSi·(CH₄OSi)n·C₃H₉Si

• Molecular Structure:

  

• Safety Description:

  S23:;
  S24/25:;
  

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