Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Coronands with 1,2-Dithio-ethene Units. II. Crystal Structures of the Two Crown Thioethers 8,9-Dicyano-8,9-didehydro-7,10-dithia-crown-4 and 11,12-Dicyano-11,12-didehydro-10,13-dithiacrown-5The structures of the title compounds have been determined by X-ray analysis. Both thioethers crystallize in the monoclinic system with the following crystal data. Dithia-crown-4: a = 751.7(1), b = 1010.4(1), c = 1639.8(2) pm, β = 95.08(1)°, Z = 4, space group P21/n; dithiacrown-5: a = 1169.9(3), b = 916.7(3), c = 1414.1(4)pm, β = 92.51(2)°, Z = 4, space group P21/c. The structures were refined to final R = 0.048 (Rw = 0.031) and 0.040 (0.046), respectively. They are characterized by their structural parameters (bond lengths and angles, torsion angles, l.s. planes) and discussed in special consideration of the ring conformation and the geometric arrangement of the donor atoms.
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