into a homochiral [Pd4(1)8] complex upon coordination to tetravalent PdII ions. The formation of this aggregate is templated by two tetrafluoroborate counterions that are encapsulated in two peripheral cavities. The resulting structure is a new structuralmotif for this kind of metallosupramolecular assemblies that arranges the palladium ions in a distorted tetrahedral fashion and forces ligand 1 to
Electrostatically Enhanced Phosphoric Acids and Their Applications in Asymmetric Friedel–Crafts Alkylations
作者:Jie Ma、Steven R. Kass
DOI:10.1021/acs.joc.9b01741
日期:2019.9.6
series of electrostatically enhanced phosphoric acid catalysts were synthesized and studied. These compounds possess two positively charged N-octylpyridinium or triarylphosphonium ion centers at the 3,3′-positions of the (R)-BINOL backbone to enhance reactivity and provide needed steric bulk for enantioselective transformations. Catalytic activities for Friedel–Crafts alkylations of indoles with trans-β-nitrostyrenes