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Abstract-The mass spectra of nine compounds belonging to the group of (-)-kauran-16-ols are reported. These compounds differ either by stereochemistry at C,, (I, 11) or by the nature of the substituent at C, (I11 to VIII). In all cases the most characteristic ions correspond to a process in which ring D is split off and lost as a C3H,0 fragment. The nature of the sobstituent R1 at C , can be deduced from such typical ions asshow little difference in their mass spectra; the assignment of configuration at this centre may be reliable only when the spectra of both epimers are compared.

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The mass spectra of a number of natural (11, IV, XII) and modified kaurenolides (I, 111, V to XI) are reported. The major fragmentations of these compounds occur by rupture of the ring B to give fragments B and C, both of which contain the ring A. In the case of the 7-hydroxycompounds (11 and 111) their mass spectra are markedly different due to the difference in configuration at C,.