Abstract
AbstractFrom a collisional activation spectral study it has been found that certain triterpene alcohols with an ursane or oleanane skeleton undergo oxidation to the corresponding ketones under chemical ionization (NH3) conditions giving rise to abundant [M + NH4 2]+ ions. Mass‐analysed ion kinetic energy and B2/E scan results indicate that both [M + NH4]+ and [M + N2H7 2]+ ions contribute to the formation of the [M + NH4 2]+ ion.
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