Results 261 to 270 of about 60,540 (292)
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Stereodirective Effects in Mixed Substituent Vinyloxycyclotriphosphazenes
Inorganic Chemistry, 2009Reaction pathways leading to the new mixed substituent cyclophosphazenes, N(3)P(3)Cl(4)(OCH=CH(2))(OCH(2)CF(3)) and N(3)P(3)Cl(3)(OCH=CH(2))(OCH(2)CF(3))(2), have been explored. Examination of the relative isomeric yields and the spectroscopic properties of these new derivatives gave insight into the mechanism of substitution of cyclophosphazenes with ...
Kenneth R, Carter +2 more
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H-Bonding-Assisted Substituent Effect
The Journal of Organic Chemistry, 2010In this paper we investigate the influence of intramolecular noncovalent interaction, i.e., H-bonding and Li-bonding, on the properties of substituents communicating through the resonance (mesomeric) effect in such molecular systems as salicylaldehyde, o-hydroxy Schiff base, o-nitrosophenol, and their lithium analogues.
Tadeusz M, Krygowski +2 more
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Substituent effects in anthrasemiquinones
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1988Electron spin resonance spectra have been obtained from series of 2-substituted anthrasemiquinones and of 3-substituted 1,8-dihydroxyanthra-semiquinones. The proton splittings are consistently assigned by means of linear correlation plots between splitting constants and a substituent-dependent parameter.
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Substituent Effects and Mechanism in a Mechanochemical Reaction
Journal of the American Chemical Society, 2018We report the effect of substituents on the force-induced reactivity of a spiropyran mechanophore. Using single molecule force spectroscopy, force-rate behavior was determined for a series of spiropyran derivatives substituted with H, Br, or NO2 para to the breaking spirocyclic C-O bond.
Meredith H. Barbee +7 more
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Manifestation of substituent effects in the Auger parameter
Physical Review B, 1988The Auger parameter is composed of contributions from both Auger and photoelectron energies; it is held to be a function of only extra-atomic relaxation (i.e., ligand polarization). Its correlation with the Hammett-Taft inductive substituent constant demonstrates this to be true.
, Sacher, , Brener
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Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1972
The kinetic behaviour is predicted for a hypothetical polymer reaction in which the reactivity of a substituent (or other reacting entity) depends on whether zero, one or two of its neighbours have already reacted. The problem is not new, but the method of analysis used here gives solutions applicable to reactions of polymer molecules containing a ...
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The kinetic behaviour is predicted for a hypothetical polymer reaction in which the reactivity of a substituent (or other reacting entity) depends on whether zero, one or two of its neighbours have already reacted. The problem is not new, but the method of analysis used here gives solutions applicable to reactions of polymer molecules containing a ...
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Substituent effects. X. Improved treatment (FMMF) of substituent effects
Journal of the American Chemical Society, 1971Michael J. S. Dewar +2 more
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Biological activity and substituent effects
Archives of Biochemistry and Biophysics, 1957D G, O'SULLIVAN, P W, SADLER
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Substituent effects. XII. Substituent effects by fluorine-19 NMR
Journal of the American Chemical Society, 1975W. Adcock +3 more
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Substituent effects on the Claisen rearrangement. The accelerating effect of a 6-donor substituent
Journal of the American Chemical Society, 1984Dennis P. Curran, Young Ger Suh
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