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Fourteen volatile components including eight allypyrocatechol analogs were isolated and identified from the essential oil and ether soluble fraction of Philippine Piper betle leaves (Piperaceae). The major constituents of Philippine Piper betle oil were chavibetol and chavibetol acetate. Capillary GC analysis of the oil showed chavibetol (53.1 %), chavibetol acetate (15.5 %), caryophyllene (3.79 %), allypyrocatechol diacetate (0.71%), campene (0.48%), chavibetol methyl ether (= methyl eugenol, 0.48%), eugenol (0.32 %), alpha-pinene (0.21%), beta-pinene (0.21 %), alpha-limonene (0.14%), safrole (0.11%), 1,8-cineol (0.04%), and allylpyro catechol monoacetate. The major component of the ether soluble fraction was allylpyrocatechol (2.38% of the leaves).
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