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Minor diterpene components of the defense secretion from the frontal gland of soldiers of the species Nasutitermes costalis (HOLMGREN) by Irena Valterováa, Miloš Buděšínskýa, František Turečekb and Jan Vrkoča is a Chemistry article available to read on EtoBox.

What is Minor diterpene components of the defense secretion from the frontal gland of soldiers of the species Nasutitermes costalis (HOLMGREN) about?

Three minor components of the defense secretion from soldiers of the species Nasutermes costalis (HOLMGREN) have been isolated and characterized by means of spectral methods. The first component was identified as 1(15),8(19)-trinervitadien-9β-ol (III), known to occur with the subfamily Nasutitermitinae. For the second component two alternative structures IVa, IVb have been tentatively suggested, both with the 7,16-secotrinervitane skeleton. The third component was determined as 5β,9β-diacetoxy-2-oxo-11(12)kempen-20-oic acid (VII). The kempene skeleton was established on the basis of the 13C NMR spectrum and mass spectral fragmentation of the acid methyl ester. The relative configuration, together with a probable conformation of the tetracyclic framework were determined by 1H NMR. Two major tricyclic components, 1(15),8(19)-trinervitadien-2α,3β-diol (I) and 1(15),8(19)-trinervitadien-2α,3α-diol (II), were further characterized as mono and diacetates. Different rates of acetylation of the hydroxy groups in these diols provided evidence of stable conformation of the six-membered ring within the trinervitane skeleton.

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Author

Irena Valterováa, Miloš Buděšínskýa, František Turečekb and Jan Vrkoča

Publisher

UOCHB; Institute of Organic Chemistry & Biochemistry, Academy of Sciences of the Czech Republic; Akademie Ved Ceske Republiky; Institute of Organic Chemistry & Biochemistry (ISSN 0010-0765)

Published

1984

Language

EN

Field

Chemistry (Physical Sciences)