Conformational analysis of cationic (R,S)- and (R,R)-(salen)manganese complexes possessing axial chirality as a chiral element based on X-ray crystallography: An explanation of the effect of apical ligand on enantioselection by (salen)manganese catalyst

Tetrahedron

Volumn 55, Issue 51, 1999, Pages 14599-14610

  Hashihayata, Takashi ^a   Punniyamurthy, T ^a   Irie, Ryo ^a   Katsuki, Tsutomu ^a   Akita, Munetaka ^b   Moro oka, Yoshihiko ^b  

^a KYUSHU UNIVERSITY   (Japan)

^b TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CATION; LIGAND; MANGANESE; MANGANESE DERIVATIVE;

ARTICLE; CATALYST; CHEMICAL INTERACTION; CHIRALITY; CONFORMATION; OXIDATION; PRIORITY JOURNAL; STEREOCHEMISTRY; STRUCTURE ANALYSIS; X RAY CRYSTALLOGRAPHY;

EID: 0033579635     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(99)00952-7     Document Type: Article

References (55)

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31. The closest contacts between the hydrogen atoms which are generated at the α carbon atoms of the apical epoxides from ideal geometry with C-H 1.10 Å and the carbon atoms of 2″-phenyl groups [respectively, 2.87 Å for (R,S)-2 b and 2.91 Å for (R,R)-2 b] are shorter than the sum of van der Waals radii of hydrogen and carbon atoms. Nishio, M.; Hirota, M. Tetrahedron, 1989, 45, 7201. Jorgensen, W. L.; Severance, D. L. J. Am. Chem. Soc., 1990, 112, 4768.
32. The following discussions in this paper are all based on the assumption that the metal-oxo bond is formed at the top face of the complexes. However, since the parent Mn-salen complexes are C2-symmetric, the oxo species having the oxene atom at bottom face are the same ones as the oxo species at top face.
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