QTAIM

The molecular ions fragmentation canals of substances registered by means of the GC-MS method in the media of Lentinula edodes (shiitake) basidiomycete submerged cultivation in the presence of diacetophenonylselenide have been substantiated. At the B3LYP/6-311++G(3df,3pd) and UB3LYP/6-311++G(3df,3pd) level, involving the NBO analysis and the R. F. W. Bader’s «Atoms in Molecules» quantum theory (QTAIM), isomeric transformations of dihydrofurans have been considered.

In living nature, of significance is lipid peroxidation caused by highly- reactive oxygen-containing species. Hydroperoxide anion –OOH represents a protolytic kind of hydrogen peroxide H2O2 – one of active forms of oxygen, – and a precursor of hydroperoxyradical •OOH – another one. The work is aimed at the investigation of spa- tial and electronic structure of hydroperoxide anion.