| Abstract: | The main directions of fragmentation and the EI of six pseudoguaianolides related to carpesiolin have been studied. It has
been established that acylation of the OH group at C-6 suppresses the selective breakdown of the guaiane skeleton, while the
simultaneous presence of AcO groups at C-2 and C-4 favors the formation of a number of characteristic ions. The hydrogenation
of the exomethylene group has no appreciable influence on direction of fragmentation.
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent. Translated from
Khimiya Prirodnykh Soedinenii, No. 4, pp. 530–535, July–August, 1993. |
