✍ Scribed by J. Klimkiewicz; L. Stefaniak; E. Grech; J. Nowicka-Scheibe; G. A. Webb
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I3C and I5N NMR data are reported for two substituted nitronaphthalenes l,S-bis(4-toluenesulphonamido)-2,4,7-trinitronaphthalene and l,S-bis(4-toluenesulphonamido)-2,4,5,7-tetranitronaphthalene and their salts with 1,s-dimethylaminonaphthalene. The salts are shown to contain NHN + and NHN-intramolecular hydrogen-bonded systems in CD,CN solutions, in agreement with x-ray diffraction data on solid samples and 'H NMR studies on solutions. Examples are given of both a symmetrical and an unsymmetrical bonding system for the NHN atoms. "N NMR is shown to be particularly helpful in these studies, both "N shielding and 'J("N, 'H) couplings are of value. Additional assistance is obtained from 3J(13C9, N1H) data. 'H spectra,' selective INEPT measurements permit the assi nments of carbons l ' , l " and 4',4" by means of 'J( C, 'H) interactions with the protons on the 3',3" and 2',2" carbons, respectively. The I3C si nal of C 10
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C and 15 N NMR data are reported for nine azoloazines. From the results obtained it is found that the 15 N chemical shifts are particularly well placed to provide reliable data on both the structures of the compounds studied and on their potential to undergo valence and prototropic tautomerism. Of p
C-nmr chemical shift tensor components are reported for a 13 C-labeled Gly 1 amide carbonyl carbon of a glycylglycine (Gly 1 Gly 2 ) single crystal, a GlyGly ⅐ HNO 3 single crystal and a GlyGly ⅐ HCl ⅐ H 2 O single crystal, for which the three-dimensional crystal structures have already been determi
Reactions of diazonium salts with 4-substituted phenylaminopent-3-en-2-ones produce the corresponding 4-phenylimino-3-phenylhydrazonopentan-2-ones. On the other hand, the reaction of diazonium salt with 4-amino(or 4-methylamino)pent-3-en-2-one gives a mixture of two isomers approaching the tautomeri
17O, 13C and 1H NMR spectra for paraand meta-substituted 4-arylaminopent-3-en-2-ones (acyclic enaminones, 1 and 2) and 3-arylaminocyclohex-2-en-1-ones (cyclic enaminones, 3 and 4) are reported. The 17O, 13C and 1H shift values of these enaminones correlate well with and constants in the correlations