Volume of mixing effect on solvent shifts in fluorine magnetic resonance spectra

1976 ◽  
Vol 22 (3) ◽  
pp. 479-485 ◽  
Author(s):  
Norbert Muller
Keyword(s):  
Magnetic Resonance ◽  
Mixing Effect ◽  
Volume Of Mixing ◽  
Solvent Shifts ◽  
Magnetic Resonance Spectra

Benzene solvent induced shifts of the proton magnetic resonance spectra of some benzene derivatives. Importance of charge effects

1970 ◽  
Vol 48 (18) ◽  
pp. 2885-2895 ◽  
Author(s):  
R. Wasylishen ◽  
T. Schaefer ◽  
R. Schwenk
Keyword(s):  
Magnetic Resonance ◽  
Linear Correlation ◽  
Proton Magnetic Resonance ◽  
Steric Effects ◽  
Benzene Derivatives ◽  
Charge Effects ◽  
Solvent Shift ◽  
Solvent Shifts ◽  
Substituent Constants ◽  
Magnetic Resonance Spectra

The benzene solvent shifts of the proton magnetic resonance spectra of numerous polysubstituted benzene derivatives are measured with respect to cyclohexane as reference solvent. For many of these compounds, an additive scheme can be devised in which the effect of a substituent, X, on the solvent shift, Δ, of a proton is given by Δix so that Δ = Σx, Σi Δix where i = ortho, meta, or para. There is a linear correlation of Δmx or Δpx with Taft's substituent constants σm0 and σp0. It is suggested that charge effects are much more important than steric effects in determining both the magnitude and sign of Δ.

Pyridine-induced solvent shifts in the nuclear magnetic resonance spectra of hydroxylic compounds

1968 ◽  
Vol 90 (20) ◽  
pp. 5480-5486 ◽  
Author(s):  
Paul V. Demarco ◽  
Eugene. Farkas ◽  
David. Doddrell ◽  
Banavara L. Mylari ◽  
Ernest. Wenkert
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectra ◽  
Solvent Shifts ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

Solvent Effects in the Nuclear Magnetic Resonance Spectra of Benzal Compounds

1974 ◽  
Vol 28 (2) ◽  
pp. 146-151 ◽  
Author(s):  
M. A. Weinberger ◽  
F. H. Meppelder ◽  
G. G. Nicholson ◽  
H. L. Holmes
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Solvent Effect ◽  
Solvent Effects ◽  
Side Chain ◽  
Nuclear Magnetic Resonance Spectra ◽  
Solvent Shifts ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

Nuclear magnetic resonance spectra of benzal compounds, Z—C6H4—CH=C(X)Y, have been determined in carbon tetrachloride, chloroform, acetone, and benzene solutions. Group X, trans to the ring, was one of NO2, COOEt, COCH3, CONH2, the series comprising mostly para-substituted (Z=NO2, Cl, H, Me, OMe, NMe2) β-nitrostyrenes, β-alkyl-β-nitrostyrenes, cinnamates, cyanocinnamates, malonates, acetoacetates, acetylacetones, and cyanocinnamides. The ambiguity in the assignments to the olefinic protons in the β-nitrostyrenes was resolved by studying deuterated compounds. The solvent shifts for the aromatic protons are shown to be additive, the olefinic side chains and the ring substituents making characteristic contributions. The solvent effect for the aromatic protons ortho to the side chain is most affected by variation of the latter and, when large, may contribute to the effect at the olefinic protons. The β-nitrostyrenes show the largest solvent shifts for the olefinic protons, and the reasons for the more marked effects at the β-proton are discussed.

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