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H/D isotopic exchange in the fast atom bombardment of ecdysteroids

✍ Scribed by Jaroslav Píš; Tomáš Vaisar

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
334 KB
Volume
32
Category
Article
ISSN
1076-5174

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✦ Synopsis

Deuterium exchange in a matrix a †ords the number of hydroxyl groups present in molecules of glycerol-O-d 3 various types of ecdysteroids in both positive and negative ionization modes. H/D exchange also allows the easy distinguishing of isomeric and isobaric compounds. It is shown that the ecdysteroids under study exchange an additional hydrogen owing to the presence of an enol form of a C6 keto group. The high extent of enolization occurring at the C22 keto functionality was observed in the pseudomolecular ion of 22-oxo-20-hydroxyecdysone.

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