Constituents of Peppers. Part VI. The Oxygenated Fraction of Pepper Essential Oil

The oxygen containing part of the essential oil of black pepper was resolved into twenty‐five fractions by preparative gas chromatography. Separation of the major compounds of these fractions was carried out by preparative open tubular column gas chromatography. The compounds were characterized by infrared, nuclear magnetic resonance, mass and ultraviolet spectroscopic studies. Trace constituents were investigated by combined gas chromatography‐mass spectrometry. Thirty‐three compounds were identified, of which only six have been reported previously as occurring in black pepper oil. Nine compounds have to our knowledge never been found in natural products.