Research on 1-AZA two-ring systems. 21. Basicities, stereochemistry, and 1H and 13C NMR spectra of pyrrolizidine and its homologs in aqueous and aqueous acetonitrile solutions. Prediction of the pKa value of trans-fused pyrrolizidine

1982 ◽  
Vol 18 (1) ◽  
pp. 32-38
Author(s):  
I. V. Antipova ◽  
V. V. Negrebetskii ◽  
I. M. Skvortsov
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Ring Systems ◽  
Aqueous Acetonitrile ◽  
Pka Value ◽  
Acetonitrile Solutions

scholarly journals SYNTHESIS OF NEW BENZO[e]DIBENZOFURO[2,3-b]-OXEPIN-5(14H)-ONES.

1996 ◽  
Vol 4 (4) ◽  
pp. 101-108
Author(s):  
Stelian Florea ◽  
Anca Nicolae ◽  
Ovidiu Maior
Keyword(s):  
Benzoic Acid ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Polyphosphoric Acid ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Ring Systems ◽  
New Compounds

The new ring systems, benzo[e]dibenzofuro[2,3-b]oxepin-5(14H)-one and benzo[e]dibenzofuro[2,1-b]oxepin-5(14H)-one were obtained by cyclizing of 2-(2-dibenzoftuyloxymethyl)benzoic acid in the presence of polyphosphoric acid ester.By cyclization of the 2-(1-methoxy-2-dibenzofuryloxymethyl) benzoic acid was obtained benzo[e]dibenzofuro[2,3-b]-oxepin-12-methoxy-5-one with a indubitable structure. The structure of the new compounds was proved by means of 1H-and 13C-NMR spectra.

Some Considerations Regarding the 1H and 13C Spectra of 4-(1-azulenyl)-2,6-bis(2-heteroaryl-vinyl)- pyrylium and Pyridinium and their Corresponding Pyridines

2018 ◽  
Vol 69 (1) ◽  
pp. 64-69
Author(s):  
Liviu Birzan ◽  
Mihaela Cristea ◽  
Constantin C. Draghici ◽  
Alexandru C. Razus
Keyword(s):  
Double Bond ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Pyridinium Salts ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Pyrylium Salts

The 1H and 13C NMR spectra of several 2,6-diheteroarylvinyl heterocycles containing 4-azulenyl moiety were recorded and their proton and carbon chemical shifts were compared with those of the compounds without double bond between the heterocycles. The influence of the nature of central and side heterocycles, molecule polarization and anisotropic effects were revealed. The highest chemical shifts were recorded for the pyrylium salts and the lowest at pyridines, but in the case of the pyridinium salts, the protons chemical shifts at the central heterocycle are more shielded due to a peculiar anisotropy of the attached vinyl groups.

Studies of the neutral trisaccharides of goat (Capra hircus) colostrum and of the one- and two-dimensional 1H and 13C NMR spectra of 6′-N-acetylglucosaminyllactose

1994 ◽  
Vol 262 (2) ◽  
pp. 173-184 ◽  
Author(s):  
Tadasu Urashima ◽  
William A. Bubb ◽  
Michael Messer ◽  
Yuhnagi Tsuji ◽  
Yasuko Taneda
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
Capra Hircus ◽  
13C Nmr Spectra ◽  
Two Dimensional ◽  
1H And 13C Nmr ◽  
The One

ChemInform Abstract: Diels-Alder Adducts of a Spirocyclopentenotriazoloazodienophile. Assignment of Their 1H and 13C NMR Spectra.

ChemInform ◽  
2010 ◽  
Vol 27 (50) ◽  
pp. no-no
Author(s):  
N. E. ALEXANDROU ◽  
G. E. MERTZANOS ◽  
J. STEPHANIDOU-STEPHANATOU ◽  
C. A. TSOLERIDIS
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
Diels Alder ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr
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