摘要:

AbstractFrom camphor (1) the ketones2–7were prepared by α‐alkylation, and the tertiary alcohols9–17by Grignard reaction. The disubstituted (iso)borneols21–26could be obtained by Grignard reaction of2–4with MtMgI or allyl magnesium halide. Reaction of2–4with EtMgl afforded the secondary alcohols18–20by reduction. Olfactive evaluation showed that the α‐monoalkylated camphors2–7as well as the 2‐alkylisoborneols9a–13a remained more or less within the camphor‐eucalyptus odour profile. However,14a–16aand the disubstituted (iso)borneols22–25possess a strong patchouli scent. The structure of a sterically hindered, rigid tertiary alcohol with 13 to 15 C‐atoms should be

ISSN:0882-5734    

DOI:10.1002/ffj.2730060102

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractFrom isophorone (1) and camphor (2) the spiro ethers3–8were prepared via the yne‐diols12–17and the ene‐diols18–23. The attempted ring closure of21and22with KHSO4furnished only the carbonyl compounds24and25. Under these conditions23gave a mixture of the isomers8aand8b. Olfactive evaluation showed that the odour goes stepwise with increasing substitution at C‐2 (3 → 4 → 5) or C‐5′ (6 → 7 → 8) from harsh, camphoraceous to fruity and finally nutty, woody notes. These sensations are comparable with those of the dehydrotheaspiranes (type B) showing that the methyl groups in a position to the osmophoric oxygen atom are particularly important for the odour profile. The strongly hindered interaction of the ether atom of8awith the receptor in comparison to the situation of the isomer8beffects a great difference in both odour quality and qu

ISSN:0882-5734    

DOI:10.1002/ffj.2730060103

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe stability of α‐ (1) and β‐asarone (2) in ethanolic solutions (30 %; 100 %; pH 7; pH3) was studied under daylight conditions over a period of six months. After rapid initial light‐induced isomerization of 1 to 2, a number of (i) oxidation products, i.e. 2,4,5‐trimethoxybenzaldehyde (4); l‐(2,4,5‐trimethoxyphenyl) propan‐2‐one (5); 2,4,5‐trimethoxypropiophenone (6); and (ii) addition products, i.e. l‐ethoxy‐l‐(2,4,5‐trimethoxyphenyl) propane (3); (1R, 2R; 1S, 2S)‐l‐ethoxy‐l‐(2,4,5‐trimethoxyphenyl) propan‐2‐ol (7A); (1R, 2S; 1S, 2R)‐l‐ethoxy‐l‐(2,4,5‐trimethoxy‐phenyl propan‐2‐ol (7B); (1R, 2R; 1S, 2S)‐l‐(2,4,5‐trimethoxyphenyl) propan‐1, 2‐diol (8A); (1R, 2S; 1S2R)‐1‐(2,4,5‐trimethoxyphenyl) propan‐1,2‐diol (8B); as well as (iii) the dimers l‐(2′,4′,5′‐trimethoxyphenyl)‐2‐methyl‐3‐(2,4,5‐trimethoxyphenyl)‐lE‐pentene (9) and l‐(2′,4′,5′‐trimethoxyphenyl)‐2‐methyl‐3‐ethyl‐lα, 2β, 3α (H)‐4,6,7‐trimethoxyindane (13) were detected after extractive sample preparation. In addition, three dimers, l‐(2′,4′,5′‐trimethoxyphenyl)‐2‐methyl‐3(2,4,5‐trimethoxyphenyl)‐penta‐1E, 4‐diene (10); 1 ‐(2′,4′,5′‐trimethoxyphenyl)‐2‐(2,4,5‐trimethoxyphenyl)‐3,4‐dimethylcyclobutane (11) and l‐(2′,4′,5′‐trimethoxyphenyl)‐2‐rnethyl‐3‐(2,4,5‐trimethoxyphenyl) prop‐l‐en‐3‐one (12) were tentatively identified. Identifications were carried

ISSN:0882-5734    

DOI:10.1002/ffj.2730060104

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractOn‐line HPLC‐HRGC coupling offers new analytical possibilities in the separation of complex mixtures. This technique has been used for the separation and identification of sesquiterpene and paraffin hydrocarbons in cold pressed citrus oils.The sesquiterpene and paraffin hydrocarbons fractions of these oils are pre‐separated in two different LC chromatographic runs, using a Hypersil 5μm(10 cm × 0.21cm i.d.) microbore column and as mobile phase, 0.2 ml/min flow‐rate,n‐pentane to isolate the sesquiterpenes, andn‐hexane to isolate the paraffins. The fractions thus separated are directly transferred on to the OV1 capillary column (22 m × 0.32 mm i.d., 0.4 μmfilm thickness), which separates the individual components.The analytical sample was obtained by a simple dilution of the oils in hexane, without any further handling; analysis time is short.The HPLC‐HRGC coupling allows a high degree of certainty in the chromatographic identification of the various components and therefore more certain information on the composition of citrus oils.The results obtained by analysing cold pressed lemon, bergamot, mandarin, sweet and bitter orange

ISSN:0882-5734    

DOI:10.1002/ffj.2730060105

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe composition of 432 samples of bergamot essential oil, absolutely genuine and produced in Calabria using a ‘pelatrice’ (peel machine) during the 1986/87 and 1987/88 seasons, has been studied by HRGC.The results obtained, together with those of 409 samples produced in the 1984/85 season, establish that the quantitative composition of bergamot essential oil (1) shows peculiar and reproducible variations for some compounds during the whole productive season and (2) greatly depends on the provenance of the fruit, the latitude but not the altitude being the determining factor.The ranges of the compounds studied are wider than those observed previously for lemon and mandarin essential oils.The results obtained help in the determination of genuineness and the quality of bergamot essential o

ISSN:0882-5734    

DOI:10.1002/ffj.2730060106

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe composition of the peel oil from Shima‐mikan (Citrus kinokuniHort. ex Tanaka) was investigated at monthly intervals and it was found that the concentration of methylN‐methylanthranilate (MMA) decreased gradually as the fruit matured. However, MMA was not detectable in the peel oils from Kishiu‐mikan and Sakurajima‐mikan, even though Shima‐mikan has been described as a member of the same botanic group as these two species of citrus. The composition of the peel oil from Shima‐mikan was found to resemble that of the Mediterrane

ISSN:0882-5734    

DOI:10.1002/ffj.2730060107

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe volatile constituents obtained from ethanol extracts of the root and the aerial parts ofHierochloe odorataL. var.pubescensKryl. growing in the east of China were examined by a combination of GC, GC‐MS and HPLC techniques. A total of 169 volatile compounds were identified. This volatile oil was rich in coumarin, which accounted for 10.3 % of the root oil and 24.9% of the aerial part oil. Quantitative analysis by HPLC showed that ethanol extract of the roots to contain 3.57% (m/m) of coumarin and that of the aerial parts 3.72% (m/m

ISSN:0882-5734    

DOI:10.1002/ffj.2730060108

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe essential oils from different parts of hyssop (Hyssopus officinalisL.) were investigated by means of GC and GC‐MS at three stages of development of the plant. Besides the main components pinocamphone, camphor and β‐pinene, 15 other terpenes were detected, among which were isopinocamphone, α and β‐phellandrene, germacrene D, and some derivatives of myrtenol. The sesquiterpene alcohol hedycaryol was found to be converted to elemol during GC and MS analysis.Compared with the essential oil content (0.03–0.16% of the fresh plant material), the glycosidic bound volatiles were present in lower concentrations (0.01–0.06%). The glycosidic fraction was hydrolysed by means of Pectinol C and β‐glucosidase yielding among others octan‐3‐ol, linalol, cis‐nerolidol, benzyl alcohol, phenylethanol, eugenol and o‐vanillin. The bicyclic terpenes myrtenol and verbenol could only be detected in small amounts as glycosides of the leaves. This fact gives reason for doubt about a direct connection between the glycosidic bound volatiles and the biogenesis of the essential o

ISSN:0882-5734    

DOI:10.1002/ffj.2730060109

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe essential oil from the leavesof Lepechiniaurbanii (Briq.) Epling from the Dominican Republic is dominated by δ‐car‐3‐ene (32.55%), δ‐copaene (13.82) and δ‐cadinene (12.51) with lesser amounts of β‐phellandrene (4.54), γ‐cadinene (3.41) and allo‐aromadendrene (2.83). Fifty‐six of 59 components were identified. Oil yield was 0.46 g/100

ISSN:0882-5734    

DOI:10.1002/ffj.2730060110

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe essential oil from flowers and leavesof Monarda didymaL. (cv. Cambridge Scarlet) was investigated by means ofGCand GC‐MS. Linalol proved to be the main component, together with other typical compounds of the Lamiaceae famil

ISSN:0882-5734    

DOI:10.1002/ffj.2730060111

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY