In II, rearrangement through a trigonalbipyramidal structure equilibrates the ethyl groups. A weakly associated solvent molecule could be liberated in this process to account for the positive 5*The ability of phosphine to catalyze phosphine exchange and the observation of what may be six-coordinate species precipitating from solution when excess Ph2PCH3 is added to la and lb further support the hypothesis that the low-energy configuration in these complexes is a solvated PtS4L square pyramid.

The picture is complicated further by the fact that ferrocene is a very efficient triplet quencher as well as a sensitiser.sThe Transition Elements," 3rd edn., Methuen, London, 1968.

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Photolysis and thermolysis of ferrocenyl azide produce the ferrocenyl radical and the nitrene which in the presence of oxygen give nitroferrocene in reasonable yields, while with cyclohexane an aziridine is formed.THE thermal and photochemical decomposition of aromatic believed that these reactions involve a discrete nitrene intermediate which can react either as the singlet or the are capable of promoting the decomposition of aryl azides under mild conditions to form aryl nitrene complexes.2 might be stabilised by atoms having low-lying d-orbitals. We report the results of a study of the thermolysis and photolysis of ferrocenyl azide (1) in cyclohexane, C,H,, and c yclohexene.

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