Results 261 to 270 of about 9,420,423 (308)
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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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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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σ‐Correlations and steric effects
Organic Magnetic Resonance, 1982AbstractCarbon‐1 shifts in 1‐dimethylimino‐3‐dimethylamino‐1‐(4‐substituted)phenylprop‐2‐ene perchlorates show high correlation and negative dependence v. a σ set having high f character, similar to α and carbonyl carbon shifts in 4‐substituted styrenes and N,N‐dimethylbezamides, respectively.
S. N. Balasubrahmanyam, I. M. Mallick
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Steric effects on geminate recombinations
Journal of the American Chemical Society, 1990Steric effects on the binding of isonitrile ligands to iron(II) porphyrins were investigated by picosecond flash photolysis. Two different types of steric effects were distinguished and characterized: (1) steric restrictions to porphyrin planarity and (2) blocking of the pathway for ligand approach.
Teddy G. Traylor +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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Conformational, Steric, and Stereoelectronic Effects
1984The 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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Steric Effect of Methylene Groups. I
Journal of the American Chemical Society, 1945R T, ARNOLD, E, RONDESTVEDT
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