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2001 (1)
1982 (1)
1Author    HansB. Ock, ErikH. EigelRequires cookie*
 Title    Interaction in M olecular Crystals, 174 [1, 2]. Crystal Growth and Structure D eterm ination o f D ifferently M ethyl-Substituted Tetraphenyl Im idodiphosphates  
 Abstract    Four differently methyl-substituted tetraphenyl imidodiphosphates [(H3C)nC6H5_ J 2PO-NH-PO[C6H5_n(CH3)n] (n = 1, 2), i. e. the 4-, 3,4-, 3,5-and 2,3-derivatives, have been crystal­ lized and their structures determined to gain information on the spatial requirements as ligands in the corresponding cesium salts. According to the packing coefficients calculated from the structural data, they increase in the sequence 4 < 3,5 < 3,4 < 2,3. The most perturbed structural motif is the hydrogen bonded, eight-membered ring of each the dimer subunits. 
  Reference    Z. Naturforsch. 56b, 469—182 (2001); eingegangen am 21. Dezember 2000 
  Published    2001 
  Keywords    Imidodiphosphate Methyl-Substituted Tetraphenyl Esters, Spatial Overcrowding, Structure Correlation 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0469.pdf 
 Identifier    ZNB-2001-56b-0469 
 Volume    56 
2Author    C. Jochum, J. Gasteiger, I. Ugi, J. DugundjiRequires cookie*
 Title    The Principle of Minimum Chemical Distance and the Principle of Minimum Structure Change  
 Abstract    The principle of minimum chemical distance (PMCD) is derived from the general theory of the BE-and R-matrices, and makes precise the vague classical • 'principle of minimum structure change". In fact, the PMCD may be seen as the principle of minimum structure change in mathematical terms. It provides a quantitative measure of chemical similarity of isomeric molecular systems. Its applications lie in the fields of correlations of substructures, elucidation of reaction mechanisms, and evaluation of synthetic path-ways as is illustrated by examples. The mathematical foundations of the computer assisted application of the PMCD are presented. 
  Reference    Z. Naturforsch. 37b, 1205—1215 (1982); received April 5 1982 
  Published    1982 
  Keywords    Chemical Topology, Structure Correlation, Measure of Chemical Similarity, Quality of Syntheses, Shortest Reaction Pathways 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1205.pdf 
 Identifier    ZNB-1982-37b-1205 
 Volume    37