New Irone-Related Constituents from the essential oil of Iris germanica L.

Twenty irone-related compounds 1 – 20 containing from 10 to 16 C-atoms have been identified for the first time in commercial Iris oil of Moroccan origin (Iris germanica L.). Most of the structures and the absolute configurations of natural 6, 16 , and 17 are corroborated by partial synthesis. The organoleptic properties of some of the new constituents are discussed.     

Composition of the essential oil ofSalvia garedzhii. Terpenoids and sesquiterpene hydrocarbons

The composition of the terpenoid and sesquiterpene hydrocarbon fraction ofSalvia garedzhii has been studied by chromato-mass spectrometry. A total of 19 compounds have been identified and a provisional assignment of another 6 components has been made.     

Constituents of the essential oil of Scabiosa flavida from Iran

The composition of the essential oil of the aerial parts of Scabiosa flavida was investigated by GC and GC-MS. Forty-three components representing 94.2% of the essential oil were characterized. The main components of the oil were tricosane (15.5%), rosifoliol (15.3%), (E)-caryophyllene (10.7%), and α-humulene (7.9%). Published in Khimiya Prirodnykh Soedinenii, No. 5, pp. 426–427, September–October, 2006.     

Composition of the essential oil ofSalvia garedzhii. Terpenoids and sesquiterpene hydrocarbons

The composition of the terpenoid and sesquiterpene hydrocarbon fraction ofSalvia garedzhii has been studied by chromato-mass spectrometry. A total of 19 compounds have been identified and a provisional assignment of another 6 components has been made.K. A. Timiryazev Moscow Agricultural Academy. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 720–722, November–December, 1984.     

Constituents of the essential oil from aerial parts of Chromolaena odorata from Thailand

The chemical composition of the essential oil from the aerial parts of Chromolaena odorata, collected from Phitsanulok, Thailand was analyzed by means of GC-(FID) and GC-MS. Twenty-two constituents were identified. The major components were pregeijerene (17.6%), germacrene D (11.1%), alpha-pinene (8.4%), beta-caryophyllene (7.3%), vestitenone (6.5%), beta-pinene (5.6%), delta-cadinene (4.9%), geijerene (3.1%), bulnesol (2.9%), and trans-ocimene (2.2%).     

Constituents of Formosan Folk Medicine. IV. The Constituents of the Leaves of Phellodendron Wilsonii Hayata Et Kanehira

Phellamurin and amurensin were isolated from the leaves of Phellodendron wilsonii Hayata et Kanehira and it was confirmed that the latter coincided with 8-isopentenylkaempferol-7-glucoside, epimedoside C.     

The thermal decomposition of hydrocarbons. Part 2. Alkylaromatic hydrocarbons: Alkylbenzenes

The pyrolysis of the n-alkylbenzenes is reviewed with emphasis on the radical chain mechanism and on the reactions of the intermediate radicals. The effects of the experimental conditions and conversion on the types and distribution of the final products are also evaluated. The Arrhenius rate parameters are summarized for both the elementary steps and the overall decomposition reactions.     

Enantiomeric composition of the chiral constituents of essential oils. Part 2: Sesquiterpene hydrocarbons

A number of sesquiterpene hydrocarbons commonly occurring in essential oils has been prepared as racemic mixtures by chemical synthesis. Preparative gas chromatography with selectively per-O-alkylated cyclodextrins has been employed for the isolation of enantiomeric mixtures or pure enantiomers from the essential oils of higher plants and liverworts (Hepaticae). The enantiomers of α-curcumene, α- and β-bisabolene, β-elemene, δ-elemene, α-copaene, δ-cadinene, cis- and trans-calamenene, and bicyclogermacrene could be resolved by enantioselective gas chromatography on capillary columns coated with cyclodextrin derivatives. The enantiomeric composition of these sesquiterpene hydrocarbons in various essential oils was determined.     

The essential oil of taurus cedar (Cedrus libani A. rich): Recent results

Water and steam distilled essential oils from wood and roots of Taurus Cedar (Cedrus libani A. Rich) obtained from Antalya and Içel (Tarsus) provinces were analyzed by GC and GCIMS. 37 components were characterized representing 90–93% of the oils. Himachalenes (-, -, and -) constituted 58.6% of the oils. In order to isolate minor sesquiterpenes, the oils were subjected to fractional distillation and chromatographic techniques. The isolated constituents were characterized by spectral analysis (IR, MS,¹H and¹³C-NMR). Cis- and trans-10,11-dihydroatlantones, cis- and trans--atlantones, 8, 9-dehydroneoisolongifolene, longipinene, -ylangene, camphor, sativene,-guijunene, longifolene (=junipene), -cedrene, -calacorene, oxidohimachalene, isohimachalone, nerolidol, longiborneol, cadalene, limonene, and terpinolene were found as constituents ofCedrus libani oil for the first time.