MASS-SPECTROMETRIC STUDY ON 2 COMPOUNDS FROM SKIMMIA-CAUREOLA SSP MULTINERVIA

The mechanisms of the mass spectrometric fragmentation of two compound s, I (evoxine) and a new compound II (O-methylcaureolol), were analyze d using mass-analyzed ion kinetic energy spectrometry, and by verifyin g the elemental composition and structure of some important fragment i ons by high-resolution data. We discovered that the double bond in pos ition 9,11 of the C ring of II may be diverted to position 7,8 of the B ring and that a typical retro-Diels-Alder reaction follows.