Abstract
Fourteen new long-chain derivatives (1j-11, 2j-21, 4a-4f, 6, and 7) have been isolated, together with the known 4-oxo-2,5-dienyl acetates 1g-1i and 4-oxo-2,5-dienals 2g-2i, from the defensive secretions of three species of Crematogaster ants from Papua-New Guinea. Their structures have been established by HREIMS and 1 H-NMR studies, and by MS-MS analyses of the dimethyl disulfide derivatives 3a-3f, 5a-5f, and 8a-8f. These results, together with those already reported on the three European Crematogaster species, suggest that the production of long-chain electrophilic contact poisons is a characteristic feature of this ant genus.
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