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| Poly(methylhydrosiloxane) Basic information |
| Poly(methylhydrosiloxane) Chemical Properties |
| Melting point | | Boiling point | 142 °C(lit.) | | density | 1.006 g/mL at 25 °C (lit.) | | vapor pressure | 38 hPa (20 °C) | | refractive index | n20/D 1.382(lit.) | | Fp | 204 °C | | storage temp. | Store below +30°C. | | Specific Gravity | 0.98 | | PH | 7 (H2O) | | Water Solubility | Not miscible or difficult to mix in water. | | CAS DataBase Reference | 63148-57-2 | | EPA Substance Registry System | Siloxanes and Silicones, Me hydrogen (63148-57-2) |
| Poly(methylhydrosiloxane) Usage And Synthesis |
| Description | Poly(methylhydrosiloxane) is a reducing agent. For example, it can
be used for the reduction of esters to alcohols as well as the
reduction of aldehydes and ketone. It can also be used for the
reduction of phosphine oxides to phosphine. Recent study has also
used it for conjugate reduction of α, β-Unsaturated Carbonyl and
Carboxyl Compounds. Finally, it is also used in greener amine
synthesis mediated by reductive amination which is an alternative to
borohydrides. | | Chemical Properties | Colorless liquid | | Uses | Polymethylhydrosiloxane(PMHS) is an easily handled,inexpensive,non-toxic,and mild reducing agent. PMHS is attractive as a substitute for more expensive or hazardous silanes or siloxanes and as the stoichiometric reductant in catalytic organotin-mediated processes.
It can be cross linked by metal catalyst at low temperature to form waterproof membrane. It is used as waterproof agent of textile, glass, pottery, paper, leather, metal, cement and marble etc, especially in textile waterproof. It is used as insulator and cross linker of paper.
Poly(methylhydrosiloxane) is used in the reduction of esters to alcohols, catalyzed by a combination of titanocene dichloride and either n-BuLi or EtMgBr. It is a safer alternative to triethoxysilane, B22063, for reduction of phosphine oxides to phosphines, catalyzed by Ti(O-i-Pr)4. It is also used in greener amine synthesis by reductive amination as an alternative to borohydrides. | | Uses | Reducing agent. | | General Description | We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product is an environmentally benign reducing agent and has been enhanced for catalytic efficiency. Click here for more information.Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products | | References | https://www.alfa.com/en/catalog/L14561/
http://www.sigmaaldrich.com/catalog/product/aldrich/176206? lang=en®ion=US
Wang, Zhigang, A. E. W. ‡. And, and J. G. Verkade. "P (MeNCH2CH2)3N: An Efficient Promoter for the Reduction of Aldehydes and Ketones with Poly (methylhydrosiloxane)." Cheminform 31.7(2000):no-no.
Dfj, Hamstra, et al. "Poly (methylhydrosiloxane) as a green reducing agent in organophosphorus-catalysed amide bond formation." Organic & Biomolecular Chemistry 15.30 (2017).
Kawamorita, Soichiro, et al. "Conjugate Reduction of α, β- Unsaturated Carbonyl and Carboxyl Compounds with Poly (methylhydrosiloxane) Catalyzed by a Silica-Supported Compact Phosphane–Copper Complex."Advanced Synthesis & Catalysis 354.18 (2012):3440-3444.
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| Poly(methylhydrosiloxane) Preparation Products And Raw materials |
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