The Journal of Organic Chemistry

Terpenoids. LVII. 1 Mass Spectral and Nuclear Magnetic Resonance Studies of Pentacyclic Triterpene Hydrocarbons2

J Karliner, C Djerassi

Index: Karliner,J.; Djerassi,C. Journal of Organic Chemistry, 1966 , vol. 31, p. 1945 - 1956

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Citation Number: 112

Abstract

As an extension of earlier~ tudies,~ the mass spectra of A12-oleanene, Al2-ursene, and deuterated analogs were determined. The use of deuterated derivatives served to confirm some fragmentation modes postulated earlier and caused revision of others. The intense and highly characteristic peak at m/e 203 was shown to be a composite fragment ion and its genesis is discussed. The synthesis of deuterated derivatives is described and suggested ...