An anthracene dimer with a fused 1,3-dithiole ring at 193 K

Abstract

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 .

2,6-exo-8,12-exo-10-Butyl-13-oxa-3,5-dithia-10-azatetracyclo[5.5.1.02,6.08,12]tridecane-9,11-dione

“…The majority of the other tetrasubstituted examples have the dithiolane ring adopting a more twisted shape with no four atoms coplanar. An exception is the rigid polycyclic structure 20, which also exhibits an envelope conformation with a flap to plane angle of 50 • [17].…”

9,10,12,13,14,15-Hexahydro-11H-9,10[1′,3′]cyclopentanthracene in two modifications

“…The 4p s + 4p s [1] photocycloaddition of arenes with 1,3-dienes affords adducts which have high internal energy [2][3][4][5][6][7][8][9][10][11][12], as manifest in pronounced elongation of the interannular carbon-carbon bonds [13,14]. Several authors have attributed these unusual bond lengths to hyperconjugative interactions between the residual p orbitals of the products and the interannular r bonds [15,16].…”

Teaching modulated structures - a project-based approach

“…References We have studied the syntheses and structures of novel O,S,S-acetal compounds where the O atom belongs to the tetrahydropyran (THP) ring with the Ssidechain at 2-position and the other S atom of the dithioacetal moiety is substituted by an aryl group. [1][2][3][4][5][6] Alkylations of these lithiated O,S,S-acetals showed remarkable diastereoselectivity, which was rationalized by the locked conformation of the five-membered ring caused by lithium-to-oxygen coordination. [5] 2-(Phenanthren-9-ylthiomethylthio)tetrahydropyran (1) is the only crystalline starting material for the lithiations obtained so far.…”

“…At low temperatures, Pr moments does not order for PrMn2-xFexGe2 with x = 0.8 and 1.0 and PrMn1.2Co0.8Ge2. These results are compared with NdMn2-xFexGe2 [3] and LaMn2-xFexSi2 [4] in respect to the effect of Fe and Co substitution on the interplane magnetic couplings. The F-AF transition at a critical Mn-Mn interatomic distance dMn-Mn within the (001) Mn layers (intralayer) is larger than the value (2.865 Å) for pure Mn compounds (e.g.…”

“…The materials required for a course are generated as per the request in the desired formats (HTML for internet-based learning material, PDF for printed manuscripts, PPT for slide presentations) by the content repository using XSL processing techniques. For further details and discussion, please visit the project website [4]. References [1] The magnetic properties of the PrMn2-xTxGe2(T=Fe and Co)compounds with ThCr2Si2-type structure(space group I 4/mmm) have been reinvestigated by neutron diffraction [1,2].…”