Showing papers on "Terpene published in 1981"
TL;DR: In this article, the biotransformation of monoterpene hydrocarbons gave some insect pheromones in high yield, and the major metabolites were as follows: (-)-trans-verbenol from (+)-, (-)-, and (+-)-alpha-pinenes.
76 citations
TL;DR: Synthesis of cis-verbenol, which is not a sex-specific pheromone, from the host plant terpene (–)-α-pinene and other metabolites from these two terpenes was not inhibited by the antibiotic.
Abstract: Ingestion of diet containing streptomycin inhibited the conversion of myrcene, a host plant terpene, to the male-specific pheromones ipsenol and ipsdienol in 1ps paraconfusus. Synthesis of cis-verbenol, which is not a sex-specific pheromone, from the host plant terpene (-)-alpha-pinene and other metabolites from these two terpenes was not inhibited by the antibiotic.
67 citations
TL;DR: The authors found that exposure of balsam fir trees to SO/sub 2/ can cause increased emission of volatile terpenes from the foliage, which may be related to the attraction of spruce budworm moths to host trees.
Abstract: Exposure of balsam fir trees to SO/sub 2/ can cause increased emission of volatile terpenes from the foliage. This phenomenon may prove to be a more general physiological reaction of conifers to SO/sub 2/. Longer term exposures of scotch pine to the gas in Europe have resulted in a similar increase in terpene emissions. The greater difference between fumigated and control plants in levels of terpene emitted may be particularly relevant to plant-insect relationships. Monoterpene hydrocarbons have been implicated in the attraction of spruce budworm moths to their host trees. After dispersal of many such forest insects, the process of finding a host tree is critical for their survival. It is conceivable that increased levels of attractive terpenes could contribute towards the success of this process. Experiments on host selection behavior of the insects when offered fumigated and unfumigated trees may provide more definitive evidence to support these conclusions.
19 citations
01 Jan 1981
TL;DR: The polyketides form a group of metabolites which are based on patterns of repeating acetate units as discussed by the authors, and isoprene (4.1) is another repeating unit.
Abstract: The polyketides form a group of metabolites which are based on patterns of repeating acetate units (Chapter 3). There is another group of metabolites, widespread in nature and rich in diverse chemistry, which is based on another repeating unit: isoprene (4.1).
7 citations
TL;DR: A GC/MS study of the hydrocarbon fraction and the fraction containing oxygenated compounds showed the presence of 12 monoterpene hydrocarbons (28.4%), 13 sesquiterpene alcohols (27.2%), 2 esters (7.2%) and 3 carbonyl compounds (4.4%) in the essential oil of Cymbopogon distans.
7 citations
TL;DR: The composition of the essential oil of Aframomum giganteum was investigated by GC-MS and forty seven terpenes were identified, the oil contained a high percentage of linalool and linalyl acetate which are mainly responsible for the smell of the A. gigsanteum stems.
Abstract: The composition of the essential oil of Aframomum giganteum was investigated by GC-MS. Forty seven terpenes were identified, the oil contained a high percentage of linalool and linalyl acetate which are mainly responsible for the smell of the A. giganteum stems. Fatty acids, paraffins, n-octanol, n-nonanol and guaiacol were also identified.
7 citations
6 citations
Patent•
28 Sep 1981
TL;DR: The terpene is one obtainable from aromatic plants by steam distillation as mentioned in this paper and is used to protect living cultures of microorganisms used in the preparation of foodstuffs by microbiological processing.
Abstract: Living cultures of microorganisms used in the preparation of foodstuffs by microbiological processing are protected against attack by bacteriophage viruses by the addition thereto of terpene. The terpene is added in an amount which is effective to obtain viricidal activity but ineffective to cause toxic effects on the microorganisms. The terpene is one obtainable from aromatic plants by steam distillation. Terpenes or mixtures of terpenes which have proved suitable are those obtained from black pepper oil, cinnamon flower oil, cardamon oil, linallyl acetate, cinnamic aldehyde, safrol, carvon and cis/ trans citral, used individually or mixed together. They may added dissolved in a carrier such as 1,2-propanediol. The terpenes demonstrate a viricidal activity in a concentration which is one or more powers of ten lower than the concentration at which the terpenes have toxic effects on the microorganisms.
3 citations
2 citations
TL;DR: In this paper, a mixture of α-cedrene and β-cedrenone was oxidized in a polar aprotic solvent (DMSO, DMF or HMPA) for 258O h at 80100°C.
Abstract: Oxygen was blown into a stirred mixture of α-cedrene (1) or β-cedrene (2) in a polar aprotic solvent (DMSO, DMF or HMPA) for 258O h at 80100°C. The oxidation of (1) in DMSO at 80°C took place to give 5-isocedranone (5), 6 (13) -cedren-5-one (6), and 5-cedren-4-one (7), while a similar oxidation of (2) yielded (5), (6), and 5-cedren-13-al (8) as major products. In DMF at 100±5°C, the oxidation of (1) gave 5α, 6α- epoxycedrane (3) that was a precursor of (5), (7), and (8), and the oxidation of (2) gave 6α, 13-epoxycedrane (4) that was a precursor of (8), (6), and 5-cedren-13-ol (9). When the oxidation of (1) was conducted in HMPA at 100±5°C, (1) was obtained selectively (68%).
TL;DR: In this article, the starting material for both syntheses is the tricyclic hemiacetal 4, readily accessible in two steps from norbornene, and the synthesis process is described.
Abstract: Stereoselective syntheses of (±)-epi-β-santalene (1) and (±)-epi-β-santalol (2), minor constituents of East Indian sandalwood oil, are described. The starting material for both syntheses is the tricyclic hemiacetal 4, readily accessible in two steps from norbornene.
Patent•
02 Feb 1981
TL;DR: In this article, a terpene-type amine derivative is converted to a hydroxylamine derivative, which is then removed to give high-purity terpENE alcohol.
Abstract: PURPOSE:To obtain the titled high-purity substance useful as perfume or a raw material of perfume or drugs, by heating terpene alcohol prepared by reducing a geranyl- and/or nerylhydroxylamine derivative, followed by cleaning terpene alcohol with an acidic aqueous solution. CONSTITUTION:A compound shown by the formula I (R is 1-6C alkyl) and/or formula II is reduced to give terpene alcohol, which is heated at 120-230 deg.C and cleaned with an acidic aqueous solution (e.g., aqueous sulfuric acid solution) so that a trace amount of a hydroxylamine derivative contained in terpene alcohol is converted to a terpene-type amine which is removed, to give high-purity terpene alcohol. Through the use of a solvent is not needed particularly, one (e.g., alcohols and benzene) which does not take part in the reaction may be used.
TL;DR: In this paper, the tricyclo[3.02,8]octan-3-ones 7 and 9 were synthesized and the enantiomers were resolved in three-step synthesis.
Abstract: Three-step syntheses and the resolution into the enantiomers are reported for the tricyclo[3.3.0.02,8]octan-3-ones 7–9, which are destined to serve as synthons for polycyclopentanoid terpenes and prostacyclin analogs. Routine overall yields of ca. 75% for 7, 40% for 8, and 46% for 9 are obtained, with 2-chloroacrylonitrile and 1,3-cyclohexadiene (for 7) and 1-methyl-1,4-cyclohexadiene (for 8 and 9) as the starting materials. The key step is the triplet-sensitized oxadi-π-methane photorearrangement of the β,γ-unsaturated ketones 1–3 which can be achieved in 80–90% yields of isolated product and quantum yields of 0.5–1.0. The racemates of both ketone 1 and its photoisomer 7 have been resolved via chromatographic separation of suitable diastereoisomeric acetal mixtures. On the other hand, sensitization of 1 with an optically active donor, (-)-14, gave only an impractical maximum enantiomeric excess of 10% (-)-7.