A new porphyrin-based porous organic polymer (POP) with BET surface area ranging from 780 to 880 m2/g was synthesized in free-base form via the reaction of meso-tetrakis(pentafluorophenyl) porphyrin and a rigid trigonal building block, hexahydroxytriphenylene. The material was then metallated with Fe(III) imparting activity for Lewis acid catalysis (regioselective methanolysis ring-opening of styrene oxide), oxidative cyclization catalysis (conversion of bis(2-hydroxy-1-naphthyl)methanes to the corresponding spirodienone), and a tandem catalytic processes: an in situ oxidation-cyclic aminal formation-oxidation sequence, which selectively converts benzyl alcohol to 2-phenyl-quinazolin-4(3H)-one. Notably, the catalyst is readily recoverable and reusable, with little loss in catalytic activity.
Aerial oxidative cyclization of methylenebisnaphthols to their corresponding spirans has been carried out using catalytic amounts of N-hydroxyimides and FeCl3·6H2O or Co(OAc)2·4H2OMn( OAc)2·4H2O. In this article we focus on the use of FeCl3·6H2O as a highly green and sustainable catalyst.
in Wiley Online Library (wileyonlinelibrary.com).Herein, a novel and convenient procedure is described for the preparation of 1,3-dibenzylimidazolidine-2,4,5-triones. This method is based on a multi-stage oxidation of hexabenzylhexaazaisowurtzitanes by hydrogen peroxide in acetic acid, leading to the title compounds in relatively good yields.
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.