Results 251 to 260 of about 290,507 (301)

Steric effects in the system

Tetrahedron, 1965
Increasing size of the group R leads to the formation of a higher proportion of ketone in the methylation of amines of the type, Ph·CH(NH2)·R, and of a higher proportion of secondary amine in the aluminohydride reduction of oximes of the type, Ph·C(:NOH)·R.
S.H. Graham, A.J.S. Williams
openaire   +1 more source

Fisher information and steric effect

Chemical Physics Letters, 2007
Abstract 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.
openaire   +1 more source

Steric effects in [2.2]metaparacyclophanes. Steric isotope effect, remote substituent effect on a steric barrier, and other steric phenomena

Journal of the American Chemical Society, 1974
S. A. Sherrod, R. L. Da Costa, R. A. Barnes, V. Boekelheide   +3 more
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Steric effects—III

Tetrahedron, 1980
Jaques-Emile Dubois, John Anthony Macphee, Annick Panaye   +2 more
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Substituent effects on steric strain

Chemical Physics Letters, 2003
Accurate quantum chemical calculations were performed on a series of mono-substituted tetrahedranes and [3]-prismanes by the high-level ab initio G3/B3LYP method. The relative stabilities of substituted tetrahedranes vs. their [3]-prismane analogues and the influence of substitution on steric strain are discussed.
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Steric effects—I

Tetrahedron, 1978
John Anthony MacPhee, Annick Panaye, Jacques-Emile Dubois   +2 more
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Conformational, Steric, and Stereoelectronic Effects

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
openaire   +1 more source

Steric Effect of Methylene Groups. I

Journal of the American Chemical Society, 1945
R T, ARNOLD, E, RONDESTVEDT
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Steric Effect of Methylene Groups. IV

Journal of the American Chemical Society, 1948
R T, ARNOLD, J, RICHTER
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Unveiling unique steric effect of threonine additive for highly reversible Zn anode

Nano Energy, 2022
Yuanhua Sang
exaly