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Abstract. CITH13N3OS, Mr=307.38, monoclinic, e2~/n, a = 9.712

Electron-rich olefins, especially tetraaminoethylenes, are strong reducing agents and react with sulfur to give cyclic thiourea derivatives in high yield. Cyclic thioureas (e.g., imidazolidine-2-thione) are of considerable importance as ligands in transition metal chemistry. There are extensive studies about cyclic thiourea, particularly those having imidazole moiety, and X-ray crystal structures of this type of cyclic ureas had been published. However, there is no example of an X-ray crystal structure study for the cyclic thiourea having benzimidazole moiety. To a solution of bis(1-ethyl-3-methylbenzimidazolidine-2-ylidine) (1 g; 3.12 mmol) in toluene (30 cm 3 ) is sulfur (0.2 g; 6.25 mmol) was added and the mixture was refluxed for 3 h. Then all

The crystal structure of manganese (II) L-tartrate tetrahydrate has been determined and refined by three-dimensional least-squares methods. The crystals are orthorhombic, space group P2 { with a = 6.092(5), b = 12.285(7), c = 7.285(4) Ä, β = 112°, and two molecules per unit cell. Photographic data refined to R = 0.078. Each manganese atom is surrounded by six oxygen atoms, four from two chelate rings of two tartrate ions, two water molecules.