The reaction of di(tert butyl) derivatives of pyrocatechol with 2,6 dihydroxyaniline afford ed 2,4,6,8 tetra(tert butyl) 9 hydroxyphenoxazin 1 one. The chemical properties of the reac tion product and its ability to form complexes with metal salts as the tridentate ligand were investigated. The structure of hydroxyphenoxazinone was established by X ray diffraction.Key words: 2,4,6,8 tetra(tert butyl) 9 hydroxyphenoxazin 1 one, tautomerism, metal che lates, tridentate ligands, ESR spectroscopy, X ray diffraction study, quantum chemical cal culations.Phenoxazine systems and their sterically hindered structural analogs can be involved in reversible one elec tron redox reactions to form paramagnetic intermediates, the presence of the tert butyl groups leading to a substan tial increase in the stability of such free radical species. 1

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