The rate of ring closure (k C ) of o-(ω-alkenyl)aryl radicals by means of an intramolecular attack of the intermediate phenyl-type radical at the tethered double bond was found to be 4.2 × 10 8 s −1 (for 1 • ) and 7.6×10 7 s −1 (for 8 • ), both being 6-exo-trig processes, and 9.6 × 10 9 s −1 for the 5-exo-trig process of 3 • . The k C rate constant of these radicals was calibrated with respect to a known rate of H-atom abstraction (k H ). The photostimulated S RN 1 reactions of radical clock precursor 1 with anions PhS − and (EtO) 2 PO − in Me 2 SO at 25°C provided the rates of addition of these nucleophiles (k Y ) to intermediate 1 • (3.2 × 10 8 and 2.5 × 10 9 M −1 s −1 , respect-

A Pt(ii) complex with a glucosylated carbene shows very high in vitro cytotoxicity and selectivity toward malignant cells.

A class of iron(III) complexes containing diversely substituted cross-bridged cyclams (1-R,R′: 1-Me,Me, 1-Me,Et, 1-Et,Et, 1-Me,Bn, 1-Bn,Bn) has been prepared and characterized.(1-R,R′) complexes catalyze the oxidation of alcohols to ketones in green conditions, by using tert-butylhydroperoxide as the oxidant in aqueous solutions. They also exhibit catalytic [a]

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