Comparative study of the chemical profiling, antioxidant and antimicrobial activities of essential oils of different parts of Boiss & Reut.

The analysis of Boiss & Reut essential oils (TW EOs) shows 33 components accounting for (96.3-97.7%) of all identified.

(3R*,6R*,4'S*,8'R*,3''R*,6''R*)-3,3''-Diisopropyl-6,6''-dimethyl-2',6'-di-phenyl-dispiro-[cyclo-hexane-1,4'-(3,7-dioxa-2,6-di-aza-bicyclo-[3.3.0]octa-ne)-8',1''-cyclo-hexa-ne]-2,2''-dione.

The two oxazolidine rings (A and B) of the title compound, C34H44N2O4, display roughly half-chair conformations, which could be described as twisted on the C-O bond. Together, the fused oxazolidine rings have a butterfly shape, with the H atoms attached to the ring junction C atoms in a cis orientation. The cyclo-hexane rings of both p-menthone fragments display chair conformations.

Chemical diversity of essential oils from Asteriscus graveolens (Forssk.) less.: identification of cis-8-Acetoxychrysanthenyl acetate as a new natural component.

Asteriscus graveolens is an endemic medicinal plant mainly distributed in south-western Algeria and south-eastern Morocco. The essential oils of leaves, stems, and flowers of A. graveolens had been studied by GC, GC/MS, and (13) C-NMR.

Antifungal activity of essential oil from Asteriscus graveolens against postharvest phytopathogenic fungi in apples.

The essential oils of the aerial parts of Asteriscus graveolens have been studied using GC and GC-MS. Twenty-eight compounds were identified in the essential oil amounting to 94.9% of the total oil.

2,2'-Dimethyl-5,5'-dipropan-2-yl-4,4'-(phenyl-methyl-ene)diphenol.

In the title mol-ecule, C(27)H(32)O(2), the aromatic rings are in a propeller configuration. In the crystal, mol-ecules are linked through O-H⋯O hydrogen bonds forming a two-dimensional network which develops parallel to (010). Futhermore, weak C-H⋯π inter-actions involving the two substituted rings build up a three-dimensional network.

4-Benzyl-6-p-tolyl-pyridazin-3(2H)-one.

The title compound, C(18)H(16)N(2)O, is a new dihydro-pyridazin-3(2H)-one derivative synthesized in one step by condensation of α-benzyl-idene-γ-tolyl-butenolide with hydrazine. The mol-ecule is not planar; the tolyl and pyridazine rings are twisted with respect to each other making a dihedral angle of 27.35 (9)° and the benzyl ring is nearly perpendicular to the pyridazine ring with a dihedral angle of 85.

1',3',3'-Trimethyl-2,3-diphenyl-2,3-di-hydro-isoxazole-5(4H)-spiro-2'-indoline.

Two diastereoisomers of the title compound, C(25)H(26)N(2)O, have been prepared by cyclo-addition between 1,3,3-trimethyl-2-methyl-eneindoline and C-phenyl-N-phenyl-nitrone. The stereochemistry of the major diastereoisomer, viz. S,R/R,S, is confirmed by the X-ray analysis.