Polymethylhydrosiloxane Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R10:Entzündlich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
clear colorless viscous liquid
Physikalische Eigenschaften
colorless free flowing liquid; average molecular
weight 1500-2200 g mol
?1 (supplier dependent); effective mass
per hydride of 60 g mol
?1; d = 1.006.
Verwenden
Polymethylhydrosiloxane (PMHS) is an easily handled, inexpensive, non-toxic, and mild reducing agent. Although relatively inert towards organic functionality, PMHS can transfer its hydride to a variety of metal catalysts (including Sn, Ti, Zn, Cu, and Pd) which can then participate in a wide range of reductions. Alternatively, when made hypercoordinate by the action of fluoride or other nucleophiles, PMHS can act directly as a reducing agent. Polymethylhydrosiloxane is widely used as reducing agent often used in conjunction with metal catalysts or
nucleophilic activators.
synthetische
hydrolysis of methyldichlorosilane followed
by heating (60–150 °C) the resultant mixture of cyclic
silanes in the presence of hexamethyldisiloxane generates the
linear polysiloxane.
Polymethylhydrosiloxane Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
