scholarly journals Steric Effects of ortho-Groups on Hydrogen Bond Formation in Phenol Derivatives as Studied by Nuclear Magnetic Resonance

1961 ◽  
Vol 34 (3) ◽  
pp. 451-452 ◽  
Author(s):  
Ichiro Yamaguchi
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Hydrogen Bond ◽  
Magnetic Resonance ◽  
Bond Formation ◽  
Steric Effects ◽  
Hydrogen Bond Formation ◽  
Phenol Derivatives ◽  
Nuclear Magnetic

A nuclear magnetic resonance study of hydrogen bonding of δ-valerolactam

1969 ◽  
Vol 47 (19) ◽  
pp. 3655-3660 ◽  
Author(s):  
J. M. Purcell ◽  
H. Susi ◽  
J. R. Cavanaugh
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Bond Formation ◽  
Resonance Spectroscopy ◽  
Hydrogen Bond Formation ◽  
Wide Range ◽  
Nuclear Magnetic

The association of amide groups of δ-valerolactam through hydrogen bonding has been investigated by means of high resolution nuclear magnetic resonance spectroscopy in CCl4 and CDCl3 solutions. Chemical shifts of the NH proton signal were measured over a wide range of temperatures and concentrations. Thermodynamic properties associated with the [Formula: see text] hydrogen bond formation were evaluated from a least squares analysis by a direct search procedure with a digital computer. The obtained enthalpy values for hydrogen bond formation are in general agreement with results obtained by other methods.

The crystal structure of ethyl-Z-3-amino-2-benzoyl-2-butenoate and measurement of the barrier to E,Z-isomerization

1980 ◽  
Vol 58 (17) ◽  
pp. 1821-1828 ◽  
Author(s):  
Gary D. Fallon ◽  
Bryan M. Gatehouse ◽  
Allan Pring ◽  
Ian D. Rae ◽  
Josephine A. Weigold
Keyword(s):  
Crystal Structure ◽  
Nuclear Magnetic Resonance ◽  
Hydrogen Bond ◽  
Free Energy ◽  
Magnetic Resonance ◽  
Energy Of Activation ◽  
X Ray ◽  
X Ray Crystallography ◽  
Free Energy Of Activation ◽  
Nuclear Magnetic

Ethyl-3-amino-2-benzoyl-2-butenoate crystallizes from pentane as either the E (mp 82–84 °C) or the Z-isomer (mp 95.5–96.5 °C). The E isomer is less stable, and changes spontaneously into the Z, which bas been identified by X-ray crystallography. The structure is characterised by an N–H/ester CO hydrogen bond and a very long C2—C3 bond (1.39 Å). Nuclear magnetic resonance methods have been used to measure the rate of [Formula: see text] isomerization at several temperatures, leading to the estimate that the free energy of activation at 268 K is 56 ± 8 kJ.

Hydrogen bond studied by 14N nuclear magnetic resonance I.

1965 ◽  
Vol 6 (2) ◽  
pp. 111-117 ◽  
Author(s):  
Hazime Saitô ◽  
Kenkichi Nukada ◽  
Hiroshi Kato ◽  
Teijiro Yonezawa ◽  
Kenichi Fukui
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Hydrogen Bond ◽  
Magnetic Resonance ◽  
Nuclear Magnetic
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