The ®rst butter¯y-shaped anthracene dimer including S atoms, 8,9-dihydro-3a,8[1 H ,2 H ]:9,13b[1 HH ,2 HH ]dibenzenodibenzo[3,4:7,8]cycloocta[1,2-d]-1,3-dithiole, C 29 H 20 S 2 , contains an exceptionally long Csp 3 ÐCsp 3 bond of 1.672 (2) A Ê in the fused 1,3dithiole ring. The length of the other bond bridging the anthracene moieties is 1.604 (3) A Ê .
In the synthesis of 1-phenyl-2-phenylthio-2-(tetrahydropyran-2-ylthio)ethanol, C(19)H(22)O(2)S(2), four diastereoisomers are formed. Two non-centrosymmetric enantiomeric forms which crystallize in space groups P2(1)2(1)2(1) and Pna2(1) are presented. The former has an intramolecular hydrogen bond between the hydroxyl group and the O atom of the tetrahydropyran ring. In the latter isomer, the hydroxyl group forms an intermolecular hydrogen bond to the O atom of the tetrahydropyranyl group of a neighbouring molecule, joining the molecules into chains in the c-axis direction; the O.O distances are 2.962 (4) and 2.764 (3) A, respectively. The tetrahydropyran rings are in chair conformations in both isomers and the S side chain has an equatorial orientation in the former, but an axial orientation in the latter molecule.
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