bluuebunny/crossref_metadata_2025_split huggingface dataset:
Novel Liquid Crystalline Compounds Containing Bicyclo[3.1.0]hexane Core Units
Authors: Kozhushkov Sergei I. , Langer Rainer , Yufit Dmitrii S. , Howard Judith A. K. , Schill Heiko , Demus Dietrich , Miyazawa Kazutoshi , de Meijere Armin 
Published: January 2004

AbstractAdditions of ethyl ortert‐butyl diazoacetates to 4‐substituted cyclopentenes6and17under dirhodium tetraacetate/tetraoctanoate catalysis led to mixtures oftert‐butylendo,exo‐ andexo,exo‐3‐carboxyl(aryl)bicyclo[3.1.0]hexane‐6‐carboxylates7and18in yields of 54−90% from whichexo,exo‐diastereomers were isolated in yields of 39−63%. Diesterexo,exo‐7was saponified and converted into diaryl diestersexo,exo‐9a,bin overall yields of 42 and 46%, respectively. The estersexo,exo‐18were reduced to the corresponding hydroxymethyl derivatives, these were transformed to the iodomethyl compounds which in turn were coupled with various alkylmagnesium halides, via Li2CuCl4catalysis, to give 3‐aryl‐6‐alkylbicyclo[3.1.0]hexyl derivativesexo,exo‐21in overall yields of 72−83%. Fluorinated 3‐(2‐arylethyl)‐6‐pentylbicyclo[3.1.0]hexaneexo,exo‐32could be prepared in five steps from 4‐ethoxy‐2,3‐difluorobenzaldehyde26aadopting essentially the same synthetic strategy, but in an overall yield of only 8%, and 6‐(4‐cyanophenyl)‐3‐pentylbicyclo[3.1.0]hexaneexo,exo‐38bwas obtained by Pd(OAc)2catalyzed cyclopropanation of 4‐pentylcyclopentene34bwith (4‐cyanophenyl)diazomethane36bin 29% yield. A comparison of the liquid crystalline properties of these newly prepared compounds containing a bicyclo[3.1.0]hexane core with those of the known analogous compounds with a cyclohexane fragment shows that as a rule, a bicyclo[3.1.0]hexane moiety decreases the transition temperature, while the dielectric (Δϵ) and optical (Δn) anisotropies are comparable. However, the bicyclo[3.1.0]hexane unit has a poorer mesogenic potential. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Efficient Synthesis of Unsymmetrical Ureido‐Linked Disaccharides
Authors: Prosperi Davide , Ronchi Silvia , Lay Luigi , Rencurosi Anna , Russo Giovanni 
Published: January 2004

AbstractFive nonsymmetrical urea‐linked disaccharides, in which two glycopyranoside units are bound at the 1⇄2, 1⇄4, and 1⇄6 positions, were efficiently synthesized. A mild and safe procedure, in which glycosyl isocyanates were coupled with a glycosylamine, was employed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Tuning the Photochromic Properties of a Flavylium Compound by pH
Authors: Moncada Margarida C. , Pina Fernando , Roque Ana , Parola A. Jorge , Maestri Mauro , Balzani Vincenzo 
Published: January 2004

AbstractWe studied the intricate pH‐ and light‐dependent network of the thermal and photochemical reactions of the 4′‐(dimethylamino)‐7‐hydroxyflavylium ion by continuous irradiation, flash photolysis, 1H NMR spectroscopy, and stopped flow analysis. The distribution of the various forms at the pH‐dependent thermodynamic equilibrium and the rates of several interconversion processes were measured. The most interesting feature of this multistate/multifunctional system is related to the possibility of pH‐tuning the colour change caused by photoirradiation, because the cis‐chalcone isomer, obtained from the photoisomerization of the trans‐chalcone form, is spontaneously transformed into coloured species (flavylium cation and quinoidal base) at low values of pH, but reverts back to the uncoloured trans‐chalcone at high values of pH because of the low energy barrier between the cis and trans chalcone isomers. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Theoretical and Experimental Study of the Regioselectivity of Michael Additions
Authors: Chatfield David C. , Augsten Alberto , D'Cunha Cassian , Lewandowska Elzbieta , Wnuk Stanislaw F. 
Published: January 2004

AbstractNucleophilic attack at an α,β‐unsaturated carbonyl moiety usually results in conjugate addition at the β‐carbon atom (1,4 or Michael addition) or, occasionally, in addition at the carbonyl carbon atom (1,2 addition). Recently, however, addition at the α‐carbon atom has been observed when strongly electron‐withdrawing groups are positioned at the carbon atom β relative to the carbonyl group [e.g., methyl 3,3‐bis(trifluoromethyl)propenoate (8) and ethyl 3‐(2,4‐dinitrophenyl)propenoate (24)]. We have performed theoretical calculations [HF/6−31+G(d) and B3LYP//HF/6−31+G(d)] for the addition of cyanide anion to model α,β‐unsaturated carbonyl compounds to determine trends in the regioselectivity with respect to properties of the substituents. The difference between the reaction barriers for α‐ vs. β‐addition decreases as the strength of electron‐withdrawing groups increases until, for sufficiently strong electron‐withdrawing groups, α‐addition becomes favored. The calculations are in agreement with the experimental results. We show that the regioselectivity can be predicted from partial atomic charges and properties of the frontier orbitals of the reactants. We also report new experimental evidence of α‐addition to polysubstituted cinnamates and cinnamaldehydes. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Novel Anti‐Inflammatory Spongian Diterpenes from the New Zealand Marine SpongeChelonaplysilla violacea
Authors: Keyzers Robert A. , Northcote Peter T. , Zubkov Oleg A. 
Published: January 2004

AbstractSix novel rearranged spongian diterpenes were isolated from the New Zealand spongeChelonaplysilla violacea. The structures of the six metabolites were determined by extensive spectral analysis. Three of the new compounds possess anti‐inflammatory activity. Pourewic acid A (4) and 15‐methoxypourewic acid B (5) represent possible intermediates in previously described biogenetic pathways. Pourewanone (3) is the first example of a formate to be isolated from the marine environment. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Synthesis and Odor of Aliphatic Musks: Discovery of a New Class of Odorants
Authors: Kraft Philip , Eichenberger Walter 
Published: January 2004

AbstractTo find new aliphatic musks, we synthesized the propionates of 2‐[1′‐(3′′,3′′‐dimethylcyclohex‐1′′‐enyl)ethoxy]‐2‐methylpropanol (8), of 2‐[1′‐(5′′,5′′‐dimethylcyclohex‐1′′‐enyl)ethoxy]‐2‐methylpropanol (11), of hydroxyacetic acid 1‐(3′,3′‐dimethylcyclohex‐1′‐enyl)ethyl ester (12), and of hydroxyacetic acid 1‐(5′,5′‐dimethylcyclohex‐1′‐enyl)ethyl ester (13) starting from 1‐(3′,3′‐dimethylcyclohex‐1′‐enyl)ethanone (5) and 1‐ethynyl‐3,3‐dimethylcyclohexanol (9). We found that the 3,3‐dimethylcyclohexenyl derivatives8(odor threshold 0.2 ng/air) and12(odor threshold 0.6 ng/air) are superior musk odorants, and, thus, we constructed 1,2,4‐trimethylpent‐2‐enyloxy analogues assecoversions. The synthesis of the esters17−26commenced with a Wittig−Horner− Emmons reaction of isobutyric aldehyde (14), followed by saponification, alkylation with methyllithium, LAH reduction, etherification with isobutylene oxide, and Steglich esterification. (2′′E)‐2′‐Methyl‐2′‐(1′′,2′′,4′′‐trimethylpent‐2′′‐enyloxy)propyl cyclopropanecarboxylate [(2′′E)‐19], which has a powerful and sweet musk odor and slightly fruity nuances, was found to be a typical representative of this new class of musk odorants, was subjected to conformational analysis. In addition, we report the synthesis and olfactory properties of the related ketones28−30, the 2‐methyl‐2‐(1′,4′,4′‐trimethylpent‐2′‐enyloxy)propyl esters31−33, and the 2‐(1′,4′‐dimethylpent‐2′‐enyloxy)‐2‐methylpropyl esters35and36. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Hydrogen Migration Over Organic Tapes: [1,5] Sigmatropic Shiftamers
Authors: Tantillo Dean J. , Hoffmann Roald 
Published: January 2004

AbstractWe explore the possibility of suprafacial hydrogen atom migration over several organic tapes—infinite chains of polycyclic conjugated hydrocarbons. It’s not easy. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Evidence for Intramolecular Ylide Formation in the Decay of a Singlet Aryl Nitrene
Authors: Tönshoff Christina , Bucher Götz 
Published: January 2004

AbstractThe photolysis of the azido‐functionalized cryptand 1 yields the benzopyrazole 2. The formation of 2 is rationalized to occur via the nitrene ammonium ylide 4, which undergoes ring‐opening by an intramolecular E2 elimination mechanism. The benzopyrazoline thus formed is then oxidized during aerobic workup. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Cover Picture: Hydrogen Migration Over Organic Tapes: [1,5] Sigmatropic Shiftamers (Eur. J. Org. Chem. 2/2004)
Authors: Tantillo Dean J. , Hoffmann Roald 
Published: January 2004

AbstractThe cover picture shows several polycyclic organic tapes over which hydrogen atoms might migrate. While hydrogen migration over metal surfaces is commonplace, the facility of analogous processes in most fully organic systems is not known. Using quantum chemical calculations, D. J. Tantillo and R. Hoffmann estimate the energetic barriers associated with hydrogen migration in these and other systems. For more details, see the article on p. 273 ff.
Analysis of enantiomeric ratios of aroma components in several ﬂowers using a Chiramix column
Authors: Tamogami Shigeyuki , Awano Ken‐ichi , Amaike Masayasu , Takagi Yoshikazu , Kitahara Takeshi 
Published: January 2004

AbstractA novel GLC column, which we named ‘Chiramix’, which was coated with a mixture of two chiral stationary phases, heptakis‐(2, 6‐di‐O‐methyl‐3‐O‐pentyl)‐β‐cyclodextrin (2, 6‐Me‐3‐Pe‐β‐CD) and octakis‐(2, 6‐di‐O‐methyl‐3‐O‐triﬂuoroacetyl)‐γ‐cyclodextrin (2, 6‐Me‐3‐TFAc‐γ‐CD), has proved to be greatly superior to those with single chiral phase for separating enantiomers of compounds having various functional groups. Extensive applications to analyse enantiomeric ratios of aroma components in several popular ﬂowers hitherto not analysed by this method were further carried out, again proving that most optical isomers of the components were signiﬁcantly easily separated using the Chiramix column.
Chemical composition of the essential oils of Ageratum conyzoides L. occurring in south China
Authors: Sundufu Abu James , Shoushan Huang 
Published: January 2004

AbstractThe essential oil isolated from the leaves and ﬂowers of Ageratum conyzoides L. were analysed by GC and GC–MS. The oil contained ageratochromene (precocene II, 25.89%); the sesquiterpene β‐caryophyllene (23.79%); demethoxyageratochromene (precocene I, 14.76%) and some monoterpene hydrocarbons, with percentages of 2–5.5%. Comparative analysis with data from Cameroon, Ghana and Vietnam is also reported. Copyright © 2003 John Wiley & Sons, Ltd.
Aromatic plants of tropical central Africa. Part XLIV.# Volatile components from Pseudocedrela kotschyi (Schweinf.) harms growing in Cameroon
Authors: Boyom F. Fekam , Fotio D. , Zollo P. H. Amvam , Agnaniet H. , Menut C. , Bessière J. M. 
Published: January 2004

AbstractThe essential oils obtained from stem and root barks of Pseudocedrela kotschyi (Schweinf.) Harms (Meliaceae) collected in Cameroon were analysed by GC and GC–MS. The two samples were found to be composed exclusively of sesquiterpenoids. The hydrocarbons were found to be most abundant in the stem bark extract, with δ‐cadinene (31.3%) as the main constituent, while the root bark oil contained a majority of oxygenated sesquiterpenoids, with cubebols representing almost one‐third of the extract. The antioxidant and antiradical activities of both samples were found to be very low compared with those of the reference compounds. Copyright © 2003 John Wiley & Sons, Ltd.
Steam volatile leaf oils of some Western Australian species of the family Myrtaceae
Authors: Lassak Erich V. , Brophy Joseph J. 
Published: January 2004

AbstractThe essential oils of Agonis obtusissima F. Muell., Eremaea pauciﬂora (Endl.) Druce, Eucalyptus erythrocorys F. Muell., Eucalyptus stoatei C. Gardner, Kunzea pulchella (Lindl.) A. S. George, Malleostemon tuberculatus (E. Pritzel) J. W. Green, Melaleuca uncinata R. Br., Thryptomene australis Endl. and Thryptomene kochii E. Pritzel have been extracted by cohobative water‐distillation of the leaves and terminal branchlets. The oils of Kunzea pulchella (both the red and the white‐ﬂowered forms) contained globulol (83–88%). The oils of Thryptomene australis contained geranic acid (52%) and α‐pinene (22%), whilst T. kochii oils contained α‐pinene (58–60%). Eremaea pauciﬂora oil contained 1,8‐cineole (22%) and the three isomeric eudesmols (α‐, β‐, γ‐; 26%). Agonis obtusissima oil contained α‐pinene (12%), trans‐β‐ocimene (16%) and globulol (39%). Malleostemon tuberculatus oil contained α‐pinene (33%), 1,8‐cineole (21%) and E,E‐farnesol (6%). The oil of Melaleuca uncinata, rich in α‐pinene (89%), represents the hydrocarbon form of this species. The oil of Eucalyptus erythrocorys contained 1,8‐cineole (59%) and α‐pinene (12%), whilst the oil of Eucalyptus stoatei contained α‐pinene (32%), 1,8‐cineole (26%), globulol (10%) and the three isomeric eudesmols (α‐, β‐, γ‐, 11%). Copyright © 2003 John Wiley & Sons, Ltd.
Volatile organic compounds from saffron
Authors: D'Auria Maurizio , Mauriello Giacomo , Rana Gian Luigi 
Published: January 2004

AbstractSPME–GC–MS analysis on four samples of saffron from different areas of Italy and from Iran were performed. Sample 1 was derived from cultivations of Crocus sativus in the zone of Salerno (Southern Italy). Sample 2 was derived from cultivations in Sardinia, Italy. Sample 3 was derived from cultivations in Abruzzo (Central Italy). Sample 4 was derived from Iran. The main components were those found in ethereal extract of saffron in a work published in 1971. Several compounds found by using other extraction—distillation techniques were not found. We found 18 compounds never discovered in saffron. In all the samples, 3,5,5‐trimethyl‐2‐cyclohexen‐1‐one, 3,5,5‐trimethyl‐2‐cyclohexen‐1,4‐dione, safranal and 2,4,4‐trimethyl‐6‐hydroxy‐3‐carboxaldehyde‐2,5‐cyclohexadien‐1‐one were found. 3,5,5‐Trimethyl‐1,4‐cyclohexandione was found in three samples. 5,5‐Dimethyl‐2‐methylene‐1‐carboxaldehyde‐3‐cyclohexene, β‐ionone were found in six samples, and nonanal, and 2,6‐di‐t‐butylphenol were found in two samples. These compounds represent the compounds found with the highest frequency. Considering the relative amount of the components, safranal is the main component in all the samples. The analyses show that saffrons from different cultivation sites have some peculiarities due to the presence of some unusual components. The sample from Iran showed the presence of 3,5,5‐trimethyl‐2‐hydroxy‐2‐cyclohexen‐1‐one, 2,7,7‐trimethyl2,4‐cycloheptadien‐1‐one, 1,3,3‐trimethyl‐2‐(E‐2‐butenylidene)‐3‐cyclo‐hexene, 5,5‐dimethyl‐1,3‐cyclohexadien‐1‐carbaldehyde, 1,1,3‐trimethyl‐2‐(Z‐2‐butenylidene)‐3‐cyclohexene, 1‐acetyl‐5,5‐dimethyl‐bycyclo[3.1.0]hexane, and β‐ionol. Copyright © 2003 John Wiley & Sons, Ltd.
Effect of feeding of 2‐phenylethyl glucopyranoside on the scent emission of cut ﬂowers
Authors: Ikemoto Takeshi , Nagai Tomoo , Fujita Akira , Iwamoto Minoru 
Published: January 2004

AbstractThe ﬂoral notes of two types of cut ﬂowers, rose (Rote rose) and baby's breath (Gypsophilia elegans), were dramatically changed when the cut stems were immersed in a vase solution containing 2‐phenylethyl β‐d‐glucopyranoside (PEBG). In a comparison between an untreated control R. rose and a treated R. rose placed in a vase solution containing 0.5% PEBG, approximately 500 times more 2‐phenylethyl alcohol was detected from the ﬂoret of the latter. In a similar comparison using G. elegans, the headspace of the treated ﬂower not only had increased levels of 2‐phenylethyl alcohol but also had decreased levels of isovaleric acid and 2‐methyl butyric acid, the main malodorous components of the ﬂower. These results suggested, ﬁrst, that PEBG is useful as a fragrance enhancer for cut ﬂowers, and second, that it may play a role in the fragrance formation of glycoside ﬂowers. Copyright © 2003 John Wiley & Sons, Ltd.
Aromatic plants from Patagonia. Part I. Antimicrobial activity and chemical composition of Schinus polygamus (Cav.) Cabrera essential oil
Authors: González Silvia , Guerra Pedro E. , Bottaro Hugo , Molares Soledad , Demo Mirta S. , Oliva Maria M. , Zunino Maria P. , Zygadlo Julio A. 
Published: January 2004

AbstractThe essential oil of Schinus polygamus (Cav.) Cabrera f: chubutensis (syn. S. marchandii Barkley) was analysed for the ﬁrst time by means of GC and GC–MS. Of 30 identiﬁed compounds, representing 96.3% of the oil, α‐phellandrene and limonene were the major components. The oil showed high antimicrobial activity against B. cereus. Copyright © 2003 John Wiley & Sons, Ltd.
Maturity discrimination of snake fruit (Salacca edulis Reinw.) cv. Pondoh based on volatiles analysis using an electronic nose device equipped with a sensor array and ﬁngerprint mass spectrometry
Authors: Supriyadi  , Shimizu Kanako , Suzuki Masayuki , Yoshida Koichi , Muto Tokie , Fujita Akira , Tomita Naomi , Watanabe Naoharu 
Published: January 2004

AbstractGC–olfactometry was used to characterize the speciﬁc aroma of a pentane extract of snake fruit (Salacca edulis Reinw cv. Pondoh). Ten compounds, including two carboxylic acids, six methyl esters, an alcohol and a furaneol (2,5‐dimethyl‐4‐hydroxy‐3(2H)‐furanone), were detected as the most characteristic odorants. Methyl esters exhibited particularly sweet and fruity odour characteristics in snake fruit at more mature stages, whereas carboxylic acids exhibited the sweaty odour that tends to prevent non‐native consumers from liking the fruit. A headspace of snake fruit at different stages of maturation was subjected to analysis using two analytical systems an electronic nose equipped with 18 sensors and ﬁngerprint mass spectrometry. Three sensors and ﬁve ions derived from esters were chosen as ﬁngerprint parameters to discriminate between maturation levels. Both systems appeared to discriminate efﬁciently between the fruits at different maturation stages. Copyright © 2003 John Wiley & Sons, Ltd.
Effect of extraction methods on the chemical composition and antioxidant activity of Egyptian marjoram (Majorana hortensis Moench)
Authors: El‐Ghorab Ahmed H. , Mansour Amr F. , El‐massry Khaled F. 
Published: January 2004

AbstractThe volatile extract compositions of marjoram (Majorana hortensis Moench) leaves obtained by hydrodistillation (HD) and supercritical ﬂuid extraction (SFE) were estimated by gas chromatography–mass spectrometry (GC–MS); 26 components were identiﬁed. The major compounds in both extracts were terpinen‐4‐ol (20.39% and 10.96%), γ‐terpinene (14.13% and 8.14%), trans‐sabinene hydrate (5.25% and 20.54%), linalool (3.72% and 4.06%), trans‐sabinene hydrate acetate (0% and 13.01%), thujanol (4.00% and 4.12%), terpinolene (4.57% and 3.70%) and thymol (0.33% and 1.18%) in HD and SFE extracts, respectively. The total monoterpene hydrocarbons are higher in HD oil (42.57%) than that of SFE extract (22.80%). However, the SFE extract possessed higher concentrations of light oxygenated compounds, which give the oil a superior aroma. Both extracts effectively inhibited the peroxide formation of linoleic acid. The antioxidant property of the SFE extract is markedly higher than that of butylated hydroxyanisol (BHA) and HD extract, which might be due to the presence of higher contents of γ‐terpinene, terpinolene and thymol. At higher concentrations, both extracts showed higher antioxidant activity compared to BHA. In order to enhance the activity of the natural extracts examined and decrease the applicability of synthetic antioxidants, the synergistic effect was also studied by adding BHA to either extracts. The mixture of either extracts and BHA results in an additive effect of their antioxidant capacities in comparison to their individual activity. Copyright © 2003 John Wiley & Sons, Ltd.
Composition and antifungal activity of essential oils isolated from Hypericum hyssopifolium and Hypericum heterophyllum
Authors: Cakir A. , Kordali S. , Zengin H. , Izumi S. , Hirata T. 
Published: January 2004

AbstractThe composition of the hydrodistilled essential oils obtained from the aerial parts of Hypericum hyssopifolium subsp. elongatum var. elongatum and H. heterophyllum Vent. were analysed by means of GC and GC–MS, and 66 compounds were determined in total. The oils showed remarkable differences in chemical composition. The oil of H. hyssopifolium, which is rich in monoterpenes, consists primarily of α‐pinene (57.3%), β‐pinene (9.0%), limonene (6.2%) and α‐phellandrene (4.4%). The oil of H. heterophyllum was a complex mixture consisting mainly of sesquiterpenes (72.9% of the total oil). In this oil, isocaryophyllene (17.1%), α‐pinene (11.6%), δ‐cadinene (9.5%), γ‐muurolene (8.2%), n‐decane (5.8%), γ‐cadinene (5.5%) and β‐caryophyllene (4.5%) were found to be major constituents. The two essential oils were tested for antifungal activity using microbial growth inhibition assays in vitro against 10 agricultural pathogenic fungi, which consisted of ﬁve Fusarium species (F. oxysporum, F. culmorum, F. sambucinum, F. solani and F. acuminatum) and ﬁve anastomosis groups of Rhizoctonia solani (AG‐3, AG‐4, AG‐5, AG‐9 and AG‐11). In general, the oils showed moderate activity against several fungal species, viz F. acuminatum, AG‐5 and AG‐11. The most signiﬁcant results were obtained against AG‐11 for H. heterophyllum oil. However, both oils increased the growth of some fungal species. In addition, the antifungal activity of 13 pure compounds identiﬁed as major components in the essential oils of the Hypericum species studied were determined using microbial growth inhibition assays against the 10 fungal species mentioned above. Among these compounds, both β‐caryophyllene oxide and α‐terpineol were inhibitory to the growth of all fungi. Copyright © 2003 John Wiley & Sons, Ltd.
Neutral components from hexane extracts of Croton sellowii
Authors: Palmeira Sebastião F. , Moura Fabyanne de S. , Alves Vanessa de L. , Oliveira Fernando M. de , Bento Edson S. , Conserva Lucia M. , Andrade Eloisa Helena de A. 
Published: January 2004

AbstractQualitative analyses by GC–FID and GC–MS of the neutral fractions from hexane extract of the leaves, stems and roots of Croton sellowii were carried out. Sesquiterpenoids, n‐alkanes, aliphatic esters and aliphatic alcohols and alkyl benzene derivatives were identiﬁed. Caryophyllene oxide (46.8%) and trans‐caryophyllene (40.8%) were most abundant in the leaves, while caryophyllene oxide (26.5%) and cubenol (16.7%) were the main constituents in the stems. In the roots, besides mesitylene (15.2%), the sesquiterpenes γ‐(7.6%), α‐(6.9%) and β‐eudesmol (5.5%) were the most abundant components. All identiﬁed constituents are described for the ﬁrst time in this species. Copyright © 2003 John Wiley & Sons, Ltd.
The volatiles of fresh‐cut Osyris alba L. flowers
Authors: Demirci Fatih , Başer K. Hüsnü Can 
Published: January 2004

AbstractOsyris alba L. (Santalaceae) was subjected to headspace–solid phase microextraction (HS–SPME) and subsequent GC–MS analysis due to the strong fragrance of volatiles emitted by the freshly collected ﬂowering branches. SPME with polydimethylsiloxane/divinylbenzene (PDMS/DVB) ﬁbre resulted in the identiﬁcation of 13 hexyl and hexenyl derivatives with a fruity, pear‐type, leafy green odour. Copyright © 2003 John Wiley & Sons, Ltd.
Essential oil composition of Hypericum brasiliense choise
Authors: Abreu Ilka N. , Reis Mariza G. , Marsaioli Anita J. , Mazzafera Paulo 
Published: January 2004

AbstractThe essential oil of the Hypericum brasiliense was obtained by hydrodistillation and its composition studied by GC–MS. The oil represented to 0.1% of the dried material and 20 substances were identiﬁed, forming 94.17% of the total oil. Sesquiterpenes were the major constituents (93.14%) of the oil and β‐caryophyllene (29.53%) was the main substance. The oxygenated sesquiterpenes in H. brasiliense represented 12.7% of the oil, and caryophyllene oxide (9.95%) was the major constituent of this fraction. Compared with other species of the genus, the composition of the essential oil of H. brasiliense is closer to the composition of H. perforatum. Copyright © 2003 John Wiley & Sons, Ltd.