Applications of NMR spectroscopy in the field of polycondensed aromatic systems

Martin, Richard; Defay, Nicole; Geerts-Evrard, F.; Given, P.H.; Jones, Joanne Roman; Wedel, R.W.

doi:10.1016/s0040-4020(01)98654-5

Cited by 38 publications

(8 citation statements)

References 11 publications

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“…The carbonyl stretching receives special attention because of their characteristic band in thioxanthone [33,34] and xanthone derivatives [35], a class of chemical compounds that differ from thioxanthones exchanging the oxygen heteroatom for a sulfur atom. In the present study, for the 4-ITX, was found the experimental mC@O axial stretching at 1630 cm…”

Section: Infrared Spectroscopymentioning

confidence: 99%

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Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Corrêa

Barolli

Ribeiro

et al. 2011

Journal of Molecular Structure

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Section: Infrared Spectroscopymentioning

confidence: 99%

“…In addition, as predicted by theoretical calculations, the CH 3 symmetric deformation vibrations is assigned to the band at 1380 cm À1 in the experimental data. [34]. Analyzing the isopropyl group, the hydrogen linking to C41 atom exhibits a septet signal in 3.49 ppm (J = 6.76 Hz).…”

mentioning

confidence: 99%

Experimental and theoretical investigation of molecular structure and conformation of the 4-isopropylthioxanthone

Corrêa

Barolli

Ribeiro

et al. 2011

Journal of Molecular Structure

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“…The 4-pyrone analogues seem to have been less intensively examined so far by 13C nmr, perhaps rather surprising in the light of the existence of detailed l H nmr data for chromones and xanthones (6) and the obvious iliiportance of chromones and flavones in nat~iral products. Kingsbury and Looker (7) have very recently reported 13C I I I I I~ data for chromone, flavone, and a series of methoxyflavones and their cliemical shift data for the parent chromone and flavone systems are in good agreement with those observed earlier by us (8).…”

Section: Introductionmentioning

confidence: 99%

Carbon-13 nuclear magnetic resonance spectra of organic sulfur compounds. Comparison of chemical shifts for carbonyl and thiocarbonyl compounds in the pyrone, thiopyrone, and pyridone series

Still¹,

Plavac²,

McKinnon³

et al. 1976

Can. J. Chem.

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13C nmr data have been obtained for a series of 2- and 4-pyrones and pyridones, and their sulfur-containing analogues. Correlations have been observed between the nature of the ring hetero-atom and the chemical shift difference (Δδ) for the Cα and Cβ carbons in these conjugated systems. No significant correlation, however, appears to exist between the chemical shifts of the C=O and C=S groups. Substituent chemical shift (s.c.s.) effects for various simple substituents are compared with those in related series of compounds.

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“…The chemical shift of the double doublet at 8.52 ppm and the singlet at 7.87 ppm are typical of H-5 and of H-2 respectively in the thiochromenone system. 12 The presence of the thiochromenone and thiochromanone systems was also established by 13 C NMR spectroscopy. The low field signals at 177.7 and 194.7 ppm are assigned to the thiochromenone and thiochroman-4-one carbonyl carbon atoms respectively and compare favourably with literature values.…”

Section: Discussionmentioning

confidence: 99%