Tetrakis(triphenylphosphine)palladium(0) catalyzes the highly regioselectiVe addition of phenyl thiocyanate (PhSCN) to terminal alkynes, which attains the simultaneous introduction of thio and cyano groups to the internal and terminal positions of alkynes, respectiVely. This reaction may proceed Via the oxidatiVe addition of PhSCN to Pd(PPh 3 ) 4 , which forms Pd-(SPh)(CN)(PPh 3 ) 2 as the key intermediate.
A highly regioselective hydroselenation of terminal alkynes with benzeneselenol can be achieved by the combination of palladium acetate and pyridine, providing the corresponding terminal alkenes, (i.e., 2-phenylseleno-1-alkenes) as a sole product. In this hydroselenation, pyridine may act as a suitable ligand for active palladium intermediates.
Gold nanoclusters stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP NCs, φ = 1.3 nm) behave as Lewis acid catalyst in aqueous media under aerobic conditions, to promote the intramolecular hydroalkoxylation of unactivated alkenes. Molecular oxygen generates a reaction center having the Lewis acidic character on the surface of Au NCs in which constituent gold atoms are formally in zero-valence state.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.