Unexpected multiple bond cleavage and rearrangement of organosulfide ligands in the presence of Cu(ii) assisted by solvothermal and solvothermal-microwave conditions

摘要

An unprecedented in situ multiple bond cleavage of S-S, S-C(sp2) and C-N in the pyrimidinedisulfide (pym2S2) ligand is observed by the reaction of CuCl2·2H2O with this ligand under solvothermal and solvothermal-microwave conditions. In this process the formation of the compound [CuII(μ-Cl)(Cl)L]2, where L represents the new ligand (L = 2-(pyrimidin-2-ylamino)-1, 3-thiazole-4- carbaldehyde), is observed. This ligand has been further isolated and X-ray characterized. The similar reaction carried out under solvothermal-microwave conditions gives, in addition to the latter compound, the complex {9·[Cu(pym2S3)(μ-Cl)(Cl)]2· [Cu(pym2S2)(μ-Cl)(Cl)]2}. Coordination of a pyrimidinetrisulfide ligand (pym2S3) is reported for the first time. This work represents an illustrative example of the novel synthetic perspectives attainable via solvothermal-microwave procedures.