Inverse Substituent Effect on77Se NMR Chemical Shifts in Naphthalene Systems with Linear 4c-6e Se4Bond: 1-[8-(p-YC6H4Se)C10H6]SeSe[C10H6(SeC6H4Y-p)-8′]-1′vs. 1-(MeSe)-8-(p-YC6H4Se)C10H6

1996 ◽  
Vol 25 (11) ◽  
pp. 947-948 ◽  
Author(s):  
Warô Nakanishi ◽  
Satoko Hayashi ◽  
Hitomi Yamaguchi
Keyword(s):  
Substituent Effect ◽  
Chemical Shifts ◽  
Nmr Chemical Shifts

The Substituent Effect. V. NMR Chemical Shifts of Hydrogen-bonding Hydroxyl Proton of Phenols in DMSO

1975 ◽  
Vol 48 (7) ◽  
pp. 2127-2133 ◽  
Author(s):  
Mizue Fujio ◽  
Masaaki Mishima ◽  
Yuho Tsuno ◽  
Yasuhide Yukawa ◽  
Yoshio Takai
Keyword(s):  
Hydrogen Bonding ◽  
Substituent Effect ◽  
Chemical Shifts ◽  
Hydroxyl Proton ◽  
Nmr Chemical Shifts

ChemInform Abstract: THE SUBSTITUENT EFFECT PART 5, NMR CHEMICAL SHIFTS OF HYDROGENBONDING HYDROXYL PROTON OF PHENOLS IN DMSO

1975 ◽  
Vol 6 (40) ◽  
Author(s):  
MIZUE FUJIO ◽  
MASAAKI MISHIMA ◽  
YUHO TSUNO ◽  
YASUHIDE YUKAWA ◽  
YOSHIO TAKAI
Keyword(s):  
Substituent Effect ◽  
Chemical Shifts ◽  
Hydroxyl Proton ◽  
Nmr Chemical Shifts

Polar effects on 13C NMR chemical shifts and rotational barriers of amides. A dual substituent parameters analysis of N,N-dimethyl-3-(5-substituted-2-furyl)-acrylamides

1987 ◽  
Vol 52 (2) ◽  
pp. 409-424 ◽  
Author(s):  
Zdeněk Friedl ◽  
Stanislav Böhm ◽  
Igor Goljer ◽  
Anna Piklerová ◽  
Daniela Poórová ◽  
...  
Keyword(s):  
Substituent Effect ◽  
Chemical Shifts ◽  
Polar Effect ◽  
Dominant Factor ◽  
Side Chain ◽  
Nmr Chemical Shifts ◽  
Resonance Effects ◽  
H Nmr ◽  
Reverse Substituent Effect ◽  
C Nmr

13C NMR chemical shifts were measured for sixteen N,N-dimethyl-3-(5-substituted-2-furyl)-acrylamides in CDCl3 at 21 °C; the barriers of rotation about the C-N bond ΔGc° were determined by using the 1H NMR coalescence method, and the positions of the IR bands of the ν(C=O) stretching vibrations were measured. The dual substituent parameters (DSP) analysis of the 13C NMR chemical shifts for atoms of the vinylcarboxamide side chain -C(3)H=C(2)H-C(1)=O(-N) gives evidence that the chemical shifts for the C-1 and C-3 atoms are controlled primarily by polar effects (δ(C-3) = -3.12σI - 1.03σR0; λ = ρI/ρR = 3.0), which exert a reverse substituent effect on these atoms. Similarly, the DSP analysis of the ΔGc° and ν(C=O) data shows that the dominant factor of the total substituent effect is the polar effect (λ = 1.95 and 1.70, respectively). A confrontation of the results of the DSP analysis with the CNDO/2 calculated electron densities at the corresponding atoms demonstrates that the reactivity of the entire vinylcarboxamide side chain can be well explained in terms of a combination of the polar effect (π-electron polarization) with resonance effects.

A NOVEL SUBSTITUENT EFFECT ON 31P NMR CHEMICAL SHIFTS IN THE ARYL DIPHENYLPHOSPHINATE SERIES

1985 ◽  
Vol 24 (3) ◽  
pp. 321-326 ◽  
Author(s):  
S. Hoz ◽  
E. J. Dunn ◽  
E. Buncel ◽  
R. A. B. Bannard ◽  
J. G. Purdon
Keyword(s):  
Substituent Effect ◽  
31P Nmr ◽  
Chemical Shifts ◽  
Nmr Chemical Shifts
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