The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Shinsaku Fujita - One of the best experts on this subject based on the ideXlab platform.
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Correlation diagrams of stereoisograms for characterizing stereoisomers of cyclobutane derivatives
Journal of Mathematical Chemistry, 2009Co-Authors: Shinsaku FujitaAbstract:Correlation diagrams of stereoisomers are developed as a versatile device for discussing the stereoisomerism of cyclobutane derivatives. A cyclobutane skeleton belongs to an RS-stereoisomeric Group, which is constructed by starting from the Point Group D4h in order to represent a global symmetry. Stereoisomers derived from the cyclobutane skeleton are treated by a main correlation diagram of stereoisograms under the action of the RS-stereoisomeric Group. In order to discuss the local symmetry of each RS-stereogenic center, on the other hand, a promolecule is generated at each RS-stereogenic center, where the RS-stereoisomeric Group for specifying the promolecule is constructed by starting from the Point Group Td. Such promolecules derived from respective stereoisomers are correlated to each other by using stereoisograms, which are further correlated to give a correlation diagram of stereoisograms. RS-stereodescriptors are discussed on the basis of such correlation diagrams of stereoisograms.
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Stereochemistry and Stereoisomerism Characterized by the Sphericity Concept
Bulletin of the Chemical Society of Japan, 2001Co-Authors: Shinsaku FujitaAbstract:The sphericity concept proposed for specifying stereochemistry in a molecule (S. Fujita, J. Am. Chem. Soc., 112, 3390 (1990)) has been extended to investigate stereoisomerism among molecules. The new matter of the present approach is to characterize the global symmetries of molecules as the “local symmetries of stereoisomerism”. Thereby, stereochemistry and stereoisomerism have been discussed on a common basis. Promolecules, which have been generated as stereochemical models of molecules by placing proligands (structureless ligands with chirality/achirality) on the vertices of a tetrahedral skeleton, have been analyzed by a permutation-Group approach as well as by a Point-Group one. The skeleton has been considered to belong to the symmetric Group of degree 4 (S[4]) as well as to the isomorphic Point Group Td. The chirality fittingness derived from the sphericity concept has been applied to the characterization of local symmetries of promolecule, where two types of Young’s tableaus have been compared. Thu...
G. Nagarajan - One of the best experts on this subject based on the ideXlab platform.
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Potential Constants and Thermodynamic Properties of Some XY4 Type Molecules
Bulletin des Sociétés Chimiques Belges, 2010Co-Authors: G. NagarajanAbstract:Potential constants of eleven molecules and eleven ions of the XY4 type with the symmetry Point Group Td have been evaluated on the basis of Wilson's Group theoretical method. The thermodynamic properties for the eleven molecules have also been calculated for a rigid rotator, harmonic oscillator approximation.