Theoretical and experimental NMR study of protopine hydrochloride isomers

. 2005 Jul ; 43 (7) : 578-81.

Jazyk angličtina Země Velká Británie, Anglie Médium print

Typ dokumentu srovnávací studie, hodnotící studie, časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/pmid15883981

The 1H and 13C NMR chemical shifts of cis- and trans-protopinium salts were measured and calculated. The calculations of the chemical shifts consisted of conformational analysis, geometry optimization (RHF/6-31G** method) and shielding constants calculations (B3LYP/6-31G** method). Based on the results of the quantum chemical calculations, two sets of experimental chemical shifts were assigned to the particular isomers. According to the experimental results, the trans-isomer is more stable and its population is approximately 68%.

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