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Aerial oxidative cyclization of bisnaphthols to their corresponding mixture of two isomeric spirans 3 and 4 has been carried out using a catalytic amount of magnetic core-shell nanoparticle-supported TEMPO (MNST) combined with a small amount of FeCl 3 ·6H 2 O. This catalytic system consistently has the advantages of moderate to good yields, low reaction times, mild and convenient conditions,...
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