A Proton Magnetic Resonance Study of 1,4-Dibromobenzene-13C Partially Oriented in Nematic Phases

1974 ◽  
Vol 52 (21) ◽  
pp. 3565-3568 ◽  
Author(s):  
E. E. Burnell ◽  
M. A. J. Sweeney
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Equal Length ◽  
Magnetic Resonance Study ◽  
Proton Magnetic Resonance Study ◽  
Nematic Phases ◽  
Magnetic Resonance Spectra

Proton magnetic resonance spectra of 1,4-dibromobenzene (13C and 12C) partially oriented in nematic phases have been measured and analyzed, and the geometry of the molecule has been determined. The angle [Formula: see text] is found to be 120.02 ± 0.01° and the angle [Formula: see text]with the assumption that all CC bond distances are of equal length the angle [Formula: see text] The JCH are determined using three spectra of samples with differing degrees of orientation.

A Proton Magnetic Resonance Study of l,4-Dichlorobenzene-13C Partially Oriented in Nematic Phases

1974 ◽  
Vol 52 (1) ◽  
pp. 151-154 ◽  
Author(s):  
E. E. Burnell ◽  
P. Diehl ◽  
W. Niederberger
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Study ◽  
Proton Magnetic Resonance Study ◽  
Nematic Phases

The p.m.r. spectra of 1,4-dichlorobenzene-(13C and 12C) partially oriented in nematic phases have been measured and analyzed, and the geometry of the molecule has been determined. The angle [Formula: see text] is found to be 119.4° and [Formula: see text] 120.3°. The JCH are determined using spectra of samples with differing degrees of orientation.

Nuclear Magnetic Resonance Experiments on Acetals. 36. Proton Magnetic Resonance Spectra and Quantitative Conformational Data in 5-Fluoromethylated-5′-Me-1,3-Dioxanes

1972 ◽  
Vol 50 (3) ◽  
pp. 423-427 ◽  
Author(s):  
M. Anteunis ◽  
P. Dirinck
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Study ◽  
Proton Magnetic Resonance Study ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

A proton magnetic resonance study of [Formula: see text] and 5-CH2F-5′-Me-1,3-dioxanes and the corresponding 2-Me-substituted derivatives enables approximate conformational insights. The system prefers an equatorial polar substitutent at C-5. This is very pronounced for CHF2, and to a lesser but still important extent for CH2F (ΔΔH0 = 488 cal/mol; ΔΔS0 = −3.0 e.u.).

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