Methyl proton resonance in nuclear magnetic resonance spectra of 2,2′- and 8,8′-dimethyl-1,1′-binaphthyls. The optical stability of (+)-2,2′-dimethyl-1,1′-binaphthyl

1971 ◽  
Vol 0 (0) ◽  
pp. 775-778 ◽  
Author(s):  
W. Dixon ◽  
Margaret M. Harris ◽  
R. Z. Mazengo
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Proton Resonance ◽  
Methyl Proton ◽  
Nuclear Magnetic Resonance Spectra ◽  
Optical Stability ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

Sporidesmins. XV, The 13C nuclear magnetic resonance spectra of sporidesmin and sporidesmin-D. The evidence in the spectra for strain imposed by an epidithio bridge

1976 ◽  
Vol 29 (10) ◽  
pp. 2307 ◽  
Author(s):  
JW Ronaldson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coupling Constants ◽  
Carbonyl Groups ◽  
Proton Resonance ◽  
Methyl Proton ◽  
Nuclear Magnetic Resonance Spectra ◽  
13C Nuclear Magnetic Resonance ◽  
Electro Negativity ◽  
Magnetic Resonance Spectra

The proton-noise-decoupled 13C N.M.R. spectra of sporidesmin and sporidesmin-D are presented. The detailed assignments were worked out from the undecoupled spectrum of sporidesmin-D. The 3-methyl resonance moved downfield (by 7.3 ppm) upon cleavage of the -S-S- bridge in sporidesmin while the peaks of the two quaternary carbons to which the sulphurs are bound moved upfield (by 4.7 ppm). Lactam N-methyl and indoline N-methyl proton resonance decoupling showed that their p.m.r. assignments should be reversed. The electro-negativity of nitrogen, sulphur and carbonyl groups increased the coupling constants of the 3-CH3 by 7Hz and of the 11-CH by 10 Hz. The carbon of the lactam N-methyl was shielded by 14 ppm. There were six three-bond couplings, four HCN13C and two HCO13C, evident but no non-aromatic HCC13C couplings.

NUCLEAR MAGNETIC RESONANCE SPECTRA OF SIX-MEMBERED ALCYCLIC RING COMPOUNDS AT LOW TEMPERATURE: IV. PARTIALLY DEUTERATED 1,2-trans-CHLOROIODOCYCLOHEXANE

1962 ◽  
Vol 40 (9) ◽  
pp. 1870-1874 ◽  
Author(s):  
E. Premuzic ◽  
L. W. Reeves
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Temperature ◽  
Proton Resonance ◽  
Resonance Signal ◽  
Ring Compounds ◽  
Nuclear Magnetic Resonance Spectra ◽  
Signal Intensities ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

A 50/50 mole% mixture of 1-iodo-2-chloro-1,3,3-trideutero-, and 1-chloro-2-iodo-1,3,3-trideutero-cyclohexane has been synthesized. At −93 °C in a CS2 solution iodochlorocyclohexane shows resolution into diaxial and diequatorial halogen forms. Analysis of the adjacent proton resonance signal intensities shows that this compound exists 68±3 mole% in the diaxial halogan form. This is quite similar to 1,2-dibromocyclohexane, which has 70 mole% in the diaxial form, and is in contrast to 1,2-dichlorocyclohexane, which has a more stable diequatorial form.

The chemistry of lauren-1-ene. I. Nuclear magnetic resonance spectra and the course of osmic acid oxidation

1980 ◽  
Vol 33 (2) ◽  
pp. 371 ◽  
Author(s):  
PJ Eaton ◽  
JM Fawcett ◽  
MK Jogia ◽  
RT Weavers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Allylic Oxidation ◽  
Acid Oxidation ◽  
Osmic Acid ◽  
Methyl Proton ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonances ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

Assignment of the carbon and methyl proton magnetic resonances of lauren-1-ene (1) is reported. The course of an unusual allylic oxidation involving osmic acid has been confirmed.

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