2-Demethylcolchifoline — A New Alkaloid from Colchicum autumnale L

Šantavý, F.; Sedmera, Petr; Potěšilová, H.; Malichová, Vladimíra; Preininger, V.

doi:10.3987/r-1979-03-0337

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Carbon‐13 Magnetic Resonance Spectroscopy. A Study Of Colchicine And Related Compounds

Elguero

Müller

Bladé-Font³

et al. 1980

Bulletin des Soc Chimique

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The carbon‐13 NMR signals of twelve cochicinic derivatives, have been assigned and some 1H‐13C coupling constants have been measured. The substituent effects, the colchicine‐isocolchicine isomerism, the prototropy of colchiceine and trimethylcolchicinic acid and the acylotropy of colchiceine acetate are discussed. There is a slight predominance of the isocolchicinic tautomer, both in the case of the prototropy and the acylotropy.

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