An Efficient Catalytic Approach for the Synthesis of Unsymmetrical Siloxanes
作者:Grzegorz Hreczycho
DOI:10.1002/ejic.201402904
日期:2015.1
expanding the variety of catalytic methods for siloxane bond formation is explored. Alkoxysilanes react with methylallylsilanes in the presence of scandium(III) trifluoromethanesulfonate to yield disiloxanes and isobutene. The reaction proceeds through one-pot hydrolysis/O-silylation of alkoxysilanes with allylsilanes (via silanol intermediates) under mild conditions. Unsaturated siloxane products are used
A Highly Effective Route to Si−O−Si Moieties through
<i>O</i>
‐Silylation of Silanols and Polyhedral Oligomeric Silsesquioxane Silanols with Disilazanes
作者:Krzysztof Kuciński、Grzegorz Hreczycho
DOI:10.1002/cssc.201802757
日期:2019.3.7
A simple and highly practical catalyst‐free O‐silylation of silanols with commercially available disilazanes has been developed under mild conditions. In the case of polyhedral oligomeric silsesquioxane (POSS) silanols and some other silanols, it was necessary to usecatalyticamounts of inexpensive Bi(OTf)3 as additional catalyst. This efficient chlorine‐free protocol involves the synthesis of a wide
A new ruthenium complex-catalyzed O-silylation of silanols with vinylsilanes leading to siloxane bond formation with the evolution of ethylene is described. A maximum conversion of silanol is reached using an excess of vinylsilane to also yield the product of the homo-coupling of the latter. Under the optimum conditions, when vinylsilane with at least one ethoxy substituent is used, the reaction gives exclusively unsymmetrical siloxanes. (c) 2007 Published by Elsevier Ltd.
O-Metalation of silanols and POSS silanols over Amberlyst-15 catalyst: A facile route to unsymmetrical siloxanes, borasiloxanes and germasiloxanes
作者:Krzysztof Kuciński、Grzegorz Hreczycho
DOI:10.1016/j.ica.2019.03.025
日期:2019.5
A simple and highly practical Amberlyst-catalyzed direct O-metalation of silanols, POSS silanols and alkoxy-silanes under mild conditions is proposed. This protocol can be applied to the synthesis of a wide range of important organosilicon derivatives such as siloxanes, germasiloxanes, borasiloxanes and functionalized silses-quioxanes. It is worth noting that Amberlyst-15 can be reused for further experiments and its catalytic activity in this process is well-preserved for several recycling steps.