摘要:

Numerous substituted trimethylcyclohexanones, trimethylcyclohexenols and trimethylhexanols have been synthesized from either 2,6,6-trimethylcyclohex-2-en-l-one or 3,5,5-trimethylcyclohex-2-en-l-one (isophorone). These compounds were examined as monocyclic partial structures of the tricyclic patchouli alcohol for their odor character and intensity. It was found that the size of the molecule (at least C10), substitution pattern, existence of a hindered tertiary hydroxyl group and the rigidity of structure were similarity determinants of the patchouli aroma character. Even so, the full balanced woody, earthy and camphoraceous character could not be found with any of them. Nevertheless, some of these simple monocyclic analogues possessed a lot of patchouli character. The odor intensity and quality for more than forty monocyclic compounds is described.

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699437

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The volatile fraction ofT. partheniumis characterized by a high camphor (44%) and trans-chrysanthenyl acetate (23%) content.T. vulgareoils, obtained from specimens growing in the province of Eastern Flanders (Belgium), conformed to the infra-specific chemical variability; three chemical types were identified: i.e., the β-thujone, trans-chrysanthenyl acetate and camphor/β-thujone types. A small scale experiment confirmed the mosquito-repellent activity ofT. vulgare, without allowing the identification of the active principle. However, the activity was much lower than that of diethyltoluamide containing commercial preparation.

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699438

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The chemical composition of the essential oil of Portuguese juniper berries(Juniperus communisL. ssp.nanaSyme) was investigated by means of gas chromatography. This analysis was compared with that of an aqueous alcoholic extract of the juniper berries of similar origin. The qualitative composition of the oil and the alcoholic extract was found to be very similar. The major hydrocarbon components of the oil were α-pinene (20.0%), δ-cadinene (10.4%), limonene (8.7%), and myrcene (8.5%), whereas the alcoholic extract contained α-pinene (11.0%), δ-cadinene (12.8%), β-caryophyllene (9.8%) and germacrene D (9.3%). The main oxygenated constituent in both the oil and the extract was borneol (8.0–8.6% respectively).

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699439

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The use ofChaetomium cochlioidesandDiplodia gossypinato perform biotransformations of bicyclic and tricyclic sesquiterpenoids was examined. Using humulene as a substrate, a strain ofChaetomium cochlioideswas found to produce numerous epoxides and hydroxylated derivatives. Hydroxylation of humulene monoepoxide proceeded much more readily than hydroxylation of the hydrocarbon. A further strainof Chaetomium cochlioideswas found to be enantioselective with respect to its products of biotransformation. Similar epoxidation and hydroxylation biotransformations were performed on caryophyllene with the same fungal strain. The use of a strain ofDiplodia gossypinato oxidize calarene and globulol also was studied. Many of the biotransformations studied were found to produce reasonable yields. Also, oxygenated sesquiterpenes were found to be more readily biotransformable than hydrocarbons. This was thought to be because of their better solubility in water.

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699440

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The essential oil ofArtemisia afraraised in Oregon was examined by GC/MS. The major components of the oil were identified as α-thujone (54.2%), β-thujone (13.7%), 1,8-cineole (13.7%) and camphor (8.8%).

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699441

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Using TLC and HPLC, the glucoside fraction of freshly harvested vanilla beans was examined. In addition to confirming that glucovanillin was the most abundant glucoside present, the glucosides of p-hydroxybenzaldehyde, p-hydroxybenzoic acid and vanillic acid also were identified. Using a combination of IR, MS,1H-NMR and13C-NMR, the structure of glucovanillin was proven to be 4-(beta-D-glucopyranosyloxy)-3-methoxybenzaldehyde.

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699442

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Twenty-two compounds have been characterized in an oil ofMicromeria teneriffae. The major components were α-pinene (20.3%), borneol (14.9%), and nerolidol (10.9%).

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699443

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699444

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:1041-2905    

DOI:10.1080/10412905.1989.9699436

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor