Thio-Thiophthen: an Unusual New Type of Aromatic System

Deformation-density studies of thiathiophthenes. I. 2,5-Dimethyl-6a-thiathiophthene

“…A suitable crystal was obtained by slow evaporation of an n-hexane solution containing 2% methanol. The crystal structure has been determined previously by photographic methods (Bezzi, Mammi & Garbuglio, 1958). The crystal data and some details of the experimental conditions of the present work are given in Table 1.…”

Novel Mesityltellurium Cations from Selenenation and Tellurenation Reactions of Dimesityl Telluride in the Presence of the Br2/AgSbF6 Reagent

“…This addition of 2 to 4 forming 8 is closely related to the well-known addition of I Ϫ to I 2 to give I 3 Ϫ , which contains a hypervalent central iodine atom. Related homonuclear trichalcogen moieties with linearly coordinated central hypervalent sulfur or selenium atoms have been known since the detection of trithiapentalenes, [23] the tris-(selenocyanate) monoanion and related species. [24] A related tetracationic system with approximately linear SeϪSe⋅⋅⋅Se arrangements is formed by the interaction of one molecule of 1,2-bis(3-methyl-2-selenoxo-4-imidazolinyl)-ethane (''ebis'') with two [(ebis) 2 ] 2ϩ dications.…”

Structure of 2-benzoylimino-3-methyl-1,3-thiazolidine: a comparison of intramolecular X–S...O = Y interactions

“…Since the solution of the structure of 2,5-dimethylthiathiophthene (Bezzi, Mammi & Garbuglio, 1958) several dozen structures possessing appreciably shorter intramolecular X-S... Z= Y approaches than the sum of the van der Waals radii of S and Z (Z = S, O, Se and N) atoms have been determined by X-ray diffraction and discussed (Lozac'h, 1971). The characteristic feature of these bond systems is a bivalent S atom in a nearly coplanar environment and the presence of conjugation in a five-membered hetero ring closed by the S. -.…”