The general object of this project is the understanding, control and profit of processes elicited by single electron transfer steps in the chemistry of aromatic and heteeroaromatic compounds. Different points will be addressed: 1)The problem of the intrinsec barrier inthe mosolytic fragmentation of radical anions. Our intention is to establish the reasons for the observed kinetic differences between the homolytic and heterolytic mesolytic cleavages of radical anions. 2) Electrophilic, electrostatic, and electronic effects in the mesolytic fragmentations of radical anions. Our main aim is to establish the differences between the pure electrostatic effects (through space) and the eleaactronic ones (trrough bonds). 3)Effect of the molecular oxygen on the reductively activated nucleophilic substitutions. The role of the superoxide anion and of the reduced substrate-oxygen complexes on the activation of these reactions will be established.4)Activation of oxyigen. Photosensitizers. The ability of different aromatic compounds to act as a singlet oxygen photosensitizers and as a superoxide anion photomediators (in the presence of reducing agents) will be established.5) Activation of nucleophilic aromatic substitutionsthrough oxidation of the internediate. In this more applied field we hope to desing new synthetic processes, more effficient and with maximun atom economy, by using a "clean" technology such as electrochemistry.
|Effective start/end date||19/12/00 → 19/12/03|