Abstract
Geijera parviflora leaves which yield geijerene
when worked up under the usual conditions of steam-distillation and fractional
distillation have been found to contain a new hydrocarbon, Cl2H18
(pregeijerene), and only a trace of geijerene. The structure of pregeijerene
has been shown by degradative and spectral
examination to be 1,5-dimethylcyclodeca-1,5,7-triene,
the disubstituted double bond having a cis
configuration. The hydrocarbon forms a crystalline adduct with silver nitrate
and rearranges thermally to
yield geijerene.
Cited by
65 articles.
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