Полиметилгидросилоксан химические свойства, назначение, производство
Химические свойства
clear colorless viscous liquid
Физические свойства
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.
Использование
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.
Подготовка
hydrolysis of methyldichlorosilane followed
by heating (60–150 °C) the resultant mixture of cyclic
silanes in the presence of hexamethyldisiloxane generates the
linear polysiloxane.
Полиметилгидросилоксан препаратная продукция и сырье
сырьё
препарат