Abstract Facets of reaction pathways as deduced from a combination of preparative efforts, photoelectron and electron spin resonance spectroscopic detection of intermediates and accompanying hypersurface calculations are presented for the temperature-dependent gas phase pyrolysis of methyl azide under nearly unimolecular conditions and for the two step single electron transfer reduction of quinones in aprotic solution containing alkaline metal salts. Aspects of molecular dynamics and especially of chemical activation are discussed for medium-sized molecules with many degrees of freedom as well as advantages of additional potentials like ion-pairing in solution or chemisorption on surfaces.
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