[4+2+2] Cycloaddition catalyzed by a new cationic rhodium–bisphosphine monooxide complex
作者:Gino Martin R. Canlas、Scott R. Gilbertson
DOI:10.1039/c4cc01320d
日期:——
A rhodium–BozPHOS based complex is reported that is competent in catalyzing the [4+2+2] cycloisomerization of cyclooctatrienes in moderate to good yields.
Unprecedented chemoselective reductions of phosphine oxides to phosphines proceed smoothly in the presence of catalytic amounts of specific Bronsted acids. By utilizing inexpensive silanes, e.g., PMHS or (EtO)(2)MeSiH, other reducible functional groups such as ketones, aldehydes, olefins, nitriles, and esters are well-tolerated under optimized conditions.
METHOD FOR PREPARING ARYLALKOXYSILANES BY DEHYDROGENATIVE SILYLATION
申请人:Dow Silicones Corporation
公开号:US20200123181A1
公开(公告)日:2020-04-23
Claimed is a method involving dehydrogenative silylation of aromatic compounds under Rh-catalysis to give an arylalkoxysilane. The method includes the steps of: 1) combining conditions appropriate to form the arylalkoxysilane, starting materials including A) an alkoxysilane having at least one silicon bonded hydrogen atom per molecule; (I) B) an aromatic compound having a carbon-hydrogen bond; and C) a rhodium bisphospholane catalyst. Additional starting materials such as D) a hydrogen acceptor and/or E) a solvent may be added during step 1). The method may further include 2) recovering the arylalkoxysilane. In a preferred embodiment the Rhodium bisphospholane catalyst is of type (II).