Results 111 to 120 of about 2,396 (173)

Fluorinated Phenylazopyrazoles for Monitoring the Photoisomerization in Complex Systems. [PDF]

Chemistry
Jakob L, van der Wal JJ, Tovtik R, Copko J, Iagatti A, Donato MD, Crespi S, Simeth NA.   +7 more
europepmc   +1 more source

Nickel-Mediated Radical Capture: Evidence for a Concerted Inner-Sphere Mechanism. [PDF]

J Am Chem Soc
Spielvogel EH, Yuan J, Hoffmann NM, Diao T.   +3 more
europepmc   +1 more source

Revealing the Mechanism of TEMPO-Hypervalent Iodine(III) Oxidation of Alcohols. [PDF]

J Am Chem Soc
Bingham M, Pradhan TR, Bhattacherjee D, Alkahtani R, Kavanagh P, Wirth T, Dingwall P.   +6 more
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The relative acidities of substituted salicylic acid in benzene correlated with the Hammett equation

, 1966
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Hammett Correlations of Benzhydrylium Cations

The Chemical Educator, 2012
This laboratory experiment investigates linear free energy relationships between Hammett σ+ parameters and the 1H-NMR chemical shifts of substituted benzhydrol reagents. The significance of resonance and field effects on proton shielding can be determined by relating chemical shift data to various forms of Hammett equations.
William H. Parsons, Louisa Hong, J. Hodge Markgraf, Sarah L. Goh   +3 more
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Hammett correlations ‘beyond the molecule’ 1

Journal of the Chemical Society, Perkin Transactions 2, 1998
The crown ether dibenzo[24]crown-8 (DB24C8) is interpenetrated by a wide range of disubstituted dibenzylammonium cations to generate [2]pseudorotaxane complexes by virtue of, inter alia, hydrogen bonds. 1H NMR spectroscopic measurements indicate that the solution phase binding strengths of the pseudorotaxane complexes can be controlled accurately via ...
Peter R. Ashton, Matthew C. T. Fyfe, Sarah K. Hickingbottom, J. Fraser Stoddart, Andrew J. P. White, David J. Williams   +5 more
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NMR Hammett correlation. A laboratory experiment

Journal of Chemical Education, 1973
A simple NMR experiment to familiarize students with the concept and uses provided by the Hammett equation, as well as introduce them to the use of NMR apparatus, chemical shift tabulation, and the application of linear regression analysis.
Manuel Salmon, Adolfo Jimenez, Ignacio Salazar, Rainer Zawadzki   +3 more
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Hammett Correlations in the Photosensitized Oxidation of 4-Substituted Thioanisoles

The Journal of Organic Chemistry, 2004
Singlet oxygen is quenched by a series of 4-substituted thioanisoles (methoxy to nitro), with rate constant k(t) = 7 x 10(4) to 7 x 10(6) M(-)(1) s(-)(1), close to the value observed for the myoglobin-catalyzed sulfoxidation of the same sulfides. Correlations with sigma (rho = -1.97) and with E(ox) (slope -3.9 V(-)(1)) are evidence for an electrophilic
ALBINI, ANGELO, FAGNONI, MAURIZIO, Bonesi Sergio   +2 more
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The significance of hammett correlations in mass spectral decompositions

Organic Mass Spectrometry, 1970
AbstractAn unexpected correlation of ion intensities with sigma constants was observed for the loss of substituents from biphenyl molecular ions. The observation is more easily reconciled with an argument based upon energy distributions in molecular ions than on interpretation in terms of rates.
Maurice M. Bursey, Peter T. Kissinger
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Reactivity of an ambiphilic carbene - a nonlinear hammett correlation

Tetrahedron Letters, 1982
Abstract Methoxychlorocarbene behaves as an ambiphile in addition reactions with styrene derivatives.
Robert A. Moss, Wenjeng Guo, Karsten Krogh-Jespersen   +2 more
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