Reaction of 2,4-Diaryl-1,3-dithia-2,4-diphosphetane-2,4-disulfides with Resorcinol

Bisdithiophosphonic acids containing two α,ωdithiophosphoryl groups [1, 2] are of interest as the podand-like compounds in substitution, intercalation, addition, and complexation reactions to create on their basis antioxidants for polymers, antioxidant additives for lubricating oils, corrosion inhibitors, extractants of metal ions, etc. [3–9]. The reactions of 2,4-dialkylor diaryl-1,3-dithia-2,4-diphosphetane-2,4-disulfides with glycols are used to obtain bisdithiophosphonic acids [1–8]. At the same time the reaction of catechol with 2,4-diferrocenyl-1,3-dithia-2,4-diphosphetane-2,4-disulfide results in 1,3,2-dioxaphospholane derivative [10], which is a secondary product formed during the desulfurization of the intermediate phenylene bisdithiophosphonic acid. In contrast, resorcinol II was found to react with 2,4-diaryl-1,3-dithia-2,4-diphosphetane-2,4-disulfides Ia and Ib in benzene at 20°C for 10 days (Ia) or at 60°C for 2 h (Ib) to give O,O'(benzene-1,3-diyl) bis(aryldithiophosphonic) acids (IIIa, IIIb) as solids. The P NMR spectra of acids IIIa and IIIb contain one characteristic signal [11] at 88.1 and 87.9 ppm, respectively. DOI: 10.1134/S1070363212020296