Showing papers by "Islamic Azad University North Tehran Branch published in 2002"
TL;DR: Water-distilled essential oil from the aerial parts of Ferulago angulata (Schlecht.) Boiss was analyzed by GC and GC/MS and twenty-five components were characterized, representing 88.7% of the total components detected with β-phellandrene and α-p Hellandrene as the major constituents.
Abstract: Water-distilled essential oil from the aerial parts of Ferulago angulata (Schlecht.) Boiss. was analyzed by GC and GC/MS. Twentγ-five components were characterized, representing 88.7% of the total components detected with β-phellandrene (32.0%) and α-phellandrene (13.8%) as the major constituents.
36 citations
TL;DR: The essential oil obtained by hydrodistillation of the aerial parts of Artemisia aucheri Boiss was analyzed and 17 components were identified, constituting 88.2% of the oil.
Abstract: The essential oil obtained by hydrodistillation of the aerial parts of Artemisia aucheri Boiss. was analyzed by GC and GC/MS. Seventeen components were identified, constituting 88.2% of the oil. The major components were camphor (45.5%) and 1,8-cineole (14.3%).
30 citations
TL;DR: Water-distilled essential oil from aerial parts of Ruta chalepensis L. was analyzed and 11 compounds representing 92.9% of the oil were identified.
Abstract: Water-distilled essential oil from aerial parts of Ruta chalepensis L. was analyzed by GC and GC/MS. Eleven compounds representing 92.9% of the oil were identified. 2-Undeeanone (52.5%) and 2-nonanone (24.1%) were the major constituents.
28 citations
TL;DR: In this paper, the structures and relative energies of fundamental conformations of cyclopenta-1,2,3-triene, cyclohepta-1 and cycloocta-1.
Abstract: The structures and relative energies of fundamental conformations of cyclopenta-1,2,3-triene, cyclohexa-1,2,3-triene, cylohepta-1,2,3-triene, cycloocta-1,2,3-triene, and cyclonona-1,2,3-triene were calculated by the HF/6-31G* and MP2/6-31G*//HF/6-31G* methods Only a C2v symmetric planar conformation is available to cyclopenta-1,2,3-triene and cyclohexa-1,2,3-triene The calculated energy barrier for ring inversion of the CS symmetric puckerd conformation of cyclohepta-1,2,3-triene via the planar geometry is 622 kJ·mol−1 The C2 symmetric twist conformation of cycloocta-1,2,3-triene was calculated to be the most stable one Conformational racemization of the twist form takes place via the CS symmetric half-chair geometry, which is by 608 kJ·mol−1 less stable than the twist conformer The CS symmetric chair and unsymmetrical twist-boat conformations of cyclonona-1,2,3-triene were calculated to have similar energies; their interconversion takes place via an unsymmetrical low-energy (184 kJ·mol−1) transition state The twist (C2) and boat (CS) geometries of cyclonona-1,2,3-triene are higher in energy by 132 and 339 kJ·mol−1, respectively Ring inversion in chair and twist-boat conformations takes place via a twist form as intermediate and requires 336 kJ·mol−1
1 citations