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Keywords:

  • Myrtus communis L.;
  • Myrtaceae;
  • Myrtle leaf oil;
  • Essential oil;
  • Monoterpenes;
  • 3,3,5,5,8,8-Hexamethyl-7-oxabicyclo[4.3.0]non-1(6)-ene-2,4-dione;
  • 4-Isobutyl-/4-Isobutenyl-5-acetoxy-4-hydroxy-2,2,6,6,tetramethylcyclohexan-1,3-dione;
  • 4-Acetoxy-3-hydroxy-3-senecioyl-2,2,5,5-tetramethylcyclopentan-1-one;
  • (Z)-/(E)-4-(2-hydroxy-2-methylpropylidene)-2,2,5,5-tetramethylcyclopentan-1,3-dione;
  • Plant growth regulator G3

Abstract

The main constituents of the essential oil from Myrtus communis L. from Iran are the monoterpenes α-pinene (35%), 1,8-cineole (28%), limonene (11%), linalol (9%), α-terpineol (5%), and linalyl acetate (2%). In the distillation residue of the oil some trace constituents were identified: 3,3,5,5,8,8-hexamethyl-7-oxabicyclo[4,3.0] non-1(6)-ene-2,4-dione (1), the 4-isobutyl- (2) and 4-isobutenyl-5-acetoxy-4-hydroxy-2,2,6,6-tetramethylcyclohexan-1,3-dione (3), 4-acetoxy-3-hydroxy-3-senecioyl-2,2,5,5-tetramethylcyclopentan-1-one (4), the known peroxide 5 (G3), and, obviously as artefacts, the (Z)- and (E)-4-(2-hydroxy-2-methylpropylidene)-2,2,5,5-tetramethylcyclopentan-l,3-dione (6). The structures of the compounds 1–6 were confirmed by their 1H- and 13C-NMR spectra.