Studies of solvent effects on the relative fluorescence quantum yield (<#>trel) and fluorescence lifetime (ts) of 2-adamantanone are presented. The ability of a given solvent to quench adamantanone fluorescence correlates well with the facility of the solvent as a hydrogen donor, suggesting that the quenching process involves at least partial intermolecular hydrogen abstraction by the adamantanone excited singlet state. Kinetic studies indicate that the alkanone , * singlet is just as reactive as the , * triplet toward quenching by hydrogen donors.

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resulting reddish-brown residue was dissolved in ethyl ether/ petroleum ether (1:9, 2 mL) and chromatographed on alumina (activity 3, 5 g) using ethyl ether/petroleum ether (1:9) as eluent. Two distinct orange bands were observed. The faster moving, more intense band yielded a fraction containing the exo compound 46 (0.0023 g, 42%), while the slower band contained the endo complex 47 (0.0009 g, 16%).Complex 46: red crystals; mp 210-212 °C; Rf 0.47, ethyl ether/ methanol /hexane (3:1:6) as eluent; IR (thin film) 2967,1609,

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