Results 211 to 220 of about 146,285 (261)
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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., Virga, E.G.
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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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B Values as a Sensitive Measure of Steric Effects
Chemistry – A European Journal, 2009AbstractSomeone who says “A” should be prepared to also say “B”: In contrast to cyclohexane model‐based A values, biphenyl model‐derived B values are powerful tools to quantify steric repulsion in and conformational behavior of ortho‐substituted aromatic compounds.magnified imageTorsional barriers of 15 ortho‐substituted biphenyls have been determined ...
R. Ruzziconi +4 more
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Recueil des Travaux Chimiques des Pays-Bas, 1949
AbstractThis paper contains data on the (pseudo) catalytic deacylation of a number of derivatives ofortho‐nitro‐acetanilide in which steric effects on mesomerism are to be expected. The rate of deacylation found for each compound is discussed in some detail on the basis of current electronic theory.It is shown that the occurrence of steric inhibition ...
B. M. Wepster, P. E. Verkade
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AbstractThis paper contains data on the (pseudo) catalytic deacylation of a number of derivatives ofortho‐nitro‐acetanilide in which steric effects on mesomerism are to be expected. The rate of deacylation found for each compound is discussed in some detail on the basis of current electronic theory.It is shown that the occurrence of steric inhibition ...
B. M. Wepster, P. E. Verkade
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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 ]
Mamoru Tobisu, Naoto Chatani
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Steric effects in molecular adsorption
The Journal of Chemical Physics, 1988The results of a molecular beam surface scattering experiment with preferentially orientated NO on Ag[111] are given. In adsorption molecules oriented with the O end towards the surface have a larger trapping probability.
M. G. Tenner +3 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 Effect of Methylene Groups. I
Journal of the American Chemical Society, 1945R T, ARNOLD, E, RONDESTVEDT
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