Results 81 to 90 of about 525 (98)

Hammett's Sigma Constants in Certain Electrophilic Reactions

Journal of Organic Chemistry, 1952
D E Pearson
exaly   +2 more sources

Notes- Hammett Sigma Constants for m-and p-Benzoyl Groups

Journal of Organic Chemistry, 1961
William White, Robert Schlitt, Donald Gwynn   +2 more
exaly   +2 more sources

Nitrogen-15 magnetic resonance spectroscopy. Correlation of the 15N-H coupling constants in aniline derivatives with Hammett .sigma. constants

Journal of the American Chemical Society, 1969
G W Milne
exaly   +3 more sources

Intramolecular Hydrogen Bonding. II. The Determination of Hammett Sigma Constants by Intramolecular Hydrogen Bonding in Schiff's Bases

Journal of the American Chemical Society, 1959
A. W. Baker, A. T. Shulgin
exaly   +2 more sources

Nuclear magnetic resonance studies of the bonding in aromatic systems. Correlation of Hammett sigma constants with methyl13C-H coupling constants and chemical shifts

Journal of the American Chemical Society, 1969
Claude H. Yoder, Richard H. Tuck, Ronald E. Hess   +2 more
exaly   +2 more sources

Linear 13C-H coupling constant-Hammett sigma-constant relations in substituted benzaldehydes

Journal of Chemical & Engineering Data, 1972
benzaldehydes, measuring the CI3 -H coupling constant of the aldehydic proton. As expected, the greater ability of the trigonal carbon atom to transmit the electronic effects of substituent X to this proton is reflected in the much greater sensitivity of the Cl3-H coupling constant to the electronic nature of X. Again excellent linear J-a relationships
Claude H. Yoder, Charles D. Schaeffer, Ronald E. Hess   +2 more
openaire   +1 more source

Estimation of Hammett sigma constants of substituted benzenes through accurate density‐functional calculation of core‐electron binding energy shifts

International Journal of Quantum Chemistry, 2005
AbstractFor substituted benzenes such as (p‐F‐C6H4‐Z), Linderberg et al. 1 demonstrated the validity of an equation similar to: ΔCEBE ≈ κσ, where ΔCEBE is the difference in core‐electron binding energies (CEBEs) of the fluorinated carbon in p‐F‐C6H4‐Z and that in FC6H5, the parameter κ is a function of the type of reaction, and σ is the Hammett ...
Yuji Takahata, Delano P. Chong
openaire   +1 more source

RESONANCE INTERACTIONS OF METHYLSULFONYL, METHYLTHIO AND RELATED GROUPINGS AS REVEALED BY HAMMETT SIGMA CONSTANTS

1953
Abstract : The relative acidities of 8 m- and p-substituted thiophenols were obtained to determine the conjugative ability of the MeSO2 was significantly larger than that from BzOH, but smaller than that from phenols or anilines. This indicated the possibility of varying degrees of resonance interactions (involving an expansion of the s valence shell ...
HARRY M. ANDERSEN, F.G. BORDWELL
openaire   +1 more source

Relationship between calculated core‐electron binding energy shifts and Hammett substituent (sigma) constants: I

Journal of Physical Organic Chemistry, 2004
AbstractFor monosubstituted benzenes (Ph‐Z), Linderberg et al. demonstrated the validity of the equation ΔCEBE ≈ κσ, where ΔCEBE is the difference between the core‐electron binding energies (CEBE) of a specific carbon in monosubstituted benzene derivatives (Ph‐Z) and that of unsubstituted benzene (Ph‐H), κ is related to the reaction constant and σ is ...
openaire   +1 more source

A Web Tool for Calculating Substituent Descriptors Compatible with Hammett Sigma Constants**

Chemistry Methods, 2022
Peter Ertl
exaly