First total synthesis of murisolinElectronic Supplementary Information (ESI) available: characterization data of synthetic murisolin (1), and 1H and 13C NMR spectra of compounds 9, 12 and 1. See http://www.rsc.org/suppdata/cc/b3/b312362f/

2004 ◽  
pp. 406 ◽  
Author(s):  
Naoyoshi Maezaki ◽  
Hiroaki Tominaga ◽  
Naoto Kojima ◽  
Minori Yanai ◽  
Daisuke Urabe ◽  
...  
Keyword(s):  
Total Synthesis ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Supplementary Information ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr

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.

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