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Conformational, Steric, and Stereoelectronic Effects [PDF]
, 1984 The total energy of a molecule is directly related to its geometry. Several aspects of molecular geometry can be recognized, and, to some extent, the energetic consequences can be dissected and attributed to specific structural features. Among the factors which contribute to total energy and have a recognizable connection with molecular geometry are ...
Francis A. Carey, Richard J. Sundberg
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Conformational and Other Steric Effects [PDF]
, 1977 The total energy of a molecule is directly related to its geometry. Several aspects of molecular geometry can be recognized, and, to some extent, the energetic consequences can be dissected and attributed to specific structural features. The features that are of greatest significance in organic chemistry are nonbonded interactions, both repulsive and ...
Francis A. Carey, Richard J. Sundberg
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Steric Effects and Solvent Effects in Ionic Reactions
Science, 2002Rates of S N 2 reactions of chloride ion with methyl- and tert -butyl–substituted chloroacetonitrile were measured by using Fourier transform–ion cyclotron resonance spectrometry to follow the isotopic exchange reaction.
Stephen L. Craig +2 more
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Steric effects in dispersion forces interactions
Physical Review E, 2008Classically, there have been two different ways to obtain mean-field theories for liquid crystals. One is based on short-range repulsive steric forces and the other on long-range attractive dispersion forces. In the former approach, it is the anisotropic shape of the molecules that leads to the anisotropic interaction, and in the latter it is the ...
SONNET A. M +1 more
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Remote Control by Steric Effects
Science, 2014A rhodium-catalyzed reaction places a silicon substituent on the site farthest away from the largest group present on an aromatic ring. [Also see Research Article by Cheng and Hartwig ]
Naoto Chatani, Mamoru Tobisu
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Steric effects on atropisomerism in tetraarylporphyrins
Journal of the American Chemical Society, 1987AbstractThe rate of aryl ring rotation in the series of porphyrins (I) is studied by NMR spectroscopy and chromatography.
Leslie D. Field +4 more
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Fisher information and steric effect
Chemical Physics Letters, 2007Abstract A modified Fisher information, the sum of the one-electron Fisher information, is proposed. It is shown that the modified Fisher information is the original Fisher information plus a sum of differences of quantum and classical variances. A generalization of the Stam’s inequality is derived.
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Steric effects in carbene cycloadditions
Tetrahedron Letters, 1983Abstract Steric effects in cycloadditions with alkenes prevent the occurrence of a general linear free energy relationship between the reactivities of carbenes. Nevertheless, the isoselective temperature remains constant.
Bernd Giese, Woo Bung Lee, Carola Stiehl
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Sterically crowded aryloxide compounds of aluminum: electronic and steric effects
Organometallics, 1991The mononuclear, four-coordinate aluminum compounds AlR 2 (BHT)L and AlR(BHT) 2 L [R=Me, Et; BHT=2,6-di-tert-butyl-4-methylphenoxide; L=2-Mepy, 4-Mepy, 2,6-Me 2 py, CH 3 CN, N(C 2 H 4 ) 3 CH, HNEt 2 , HN i Bu 2 , H 2 N t Bu,H 2 N n Bu, NH 3 , py•O] are obtained when AlR 3 is treated with the correct molar equivalent of BHT-H and the appropriate Lewis ...
Matthew D. Healy +2 more
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The question of remote steric effects
Tetrahedron Letters, 1994Abstract Remote steric effects, thought to arise from long hydrocarbon chains coiling about reactive sites, are absent in three non-aqueous systems designed to maximize the effect.
F.M. Menger, Kingsley H. Nelson
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