Poly(methylhydrosiloxane)

Bezeichnung:Poly(methylhydrosiloxane)

CAS-Nr63148-57-2

Englisch Name:Poly(methylhydrosiloxane)

CBNumberCB0694968

SummenformelC7H22O2Si3

Molgewicht222.5

MOL-Datei63148-57-2.mol

Poly(methylhydrosiloxane) physikalisch-chemischer Eigenschaften

Schmelzpunkt	<-60°C
Siedepunkt	142 °C(lit.)
Dichte	1.006 g/mL at 25 °C (lit.)
Dampfdruck	38 hPa (20 °C)
Brechungsindex	n20/D 1.382(lit.)
Flammpunkt	204 °C
storage temp.	Store below +30°C.
Löslichkeit	Soluble in most ethereal, chlorinated, or hydrocarbon solvents as well as EtOH, i-PrOH, warm DMF, and warm NMP; insoluble in MeOH, DMSO, acetonitrile, and water
Wichte	0.98
PH	7 (H2O)
Wasserlöslichkeit	Not miscible or difficult to mix in water.
CAS Datenbank	63148-57-2
EPA chemische Informationen	Siloxanes and Silicones, Me hydrogen (63148-57-2)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	10-36/37/38
S-Sätze:	26-36-24/25-23-16
WGK Germany	3
F	10-21
TSCA	Yes
HS Code	39100000

Gefahreninformationscode (GHS)

Poly(methylhydrosiloxane) Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R10:Entzündlich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S16:Von Zündquellen fernhalten - Nicht rauchen.
Beschreibung
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.
Chemische Eigenschaften
Colorless liquid
Verwenden
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.
synthetische
Poly(methylhydrosiloxane) is prepared by hydrolysis of methyldichlorosilane followed by heating (60–150℃) the resultant mixture of cyclic silanes in the presence of hexamethyldisiloxane generates the linear polysiloxane.
Allgemeine Beschreibung
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
Synthese
Poly(methylhydrosiloxane)(PMHS) is synthesized by the controlled hydrolysis of MeSiHCl₂^[1].
Advantages
PMHS is synthesized by the controlled hydrolysis of MeSiHCl2, a byproduct in producing Me2SiCl2, a feedstock for the silicone industry. As a byproduct of the silicone industry, it is a cheap, easy to handle, and environmentally friendly reducing agent. PMHS is more air and moisture-stable than other silanes and can be stored for long periods of time without loss of activity. In addition to being synthesized from a waste product, PMHS is cheap, stable to air and moisture, and is considered nontoxic[2].
Einzelnachweise
[1] HEIN N M, SEO Y, LEE S J, et al. Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products?[J]. Green Chemistry, 2019, 10: 2662-2669. DOI:10.1039/C9GC00705A.
[2] Hein, Nicholas M. et al. “Harnessing the reactivity of poly(methylhydrosiloxane) for the reduction and cyclization of biomass to high-value products?.” Green Chemistry 10 (2019): 2662–2669.

Poly(methylhydrosiloxane) Upstream-Materialien And Downstream Produkte

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