Premium
6‐Hydroxycarvotanacetone and other constituents of the essential oil of Laggera alata (D. Don) Sch. Bip. ex Oliv.
Author(s) -
Onayade O. A.,
Scheffer J. J. C.,
Schripsema J.,
Van Gen A. Der
Publication year - 1990
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.2730050307
Subject(s) - chemistry , essential oil , sabinene , ether , traditional medicine , chromatography , organic chemistry , limonene , medicine
The essential oil from the herb of Laggera alata (D. Don) Sch. Bip. ex Oliv. was analysed by means of GLC, LSC, GC–MS and 1 H‐NMR spectrometry. Most of its components were identified, amongst which were phenolic ethers (about 45%), monoterpenes (22%) and sesquiterpenes (12%). The main components of the oil were 2,5‐dimethoxy‐ p ‐cymene ( = thymoquinol dimethyl ether; 44%), and sabinene (16%). Another component (3%) was found to be 2‐methyl‐5‐(1‐methylethyl)‐6‐hydroxycyclohex‐2‐en‐1‐one ( = 6‐hydroxycarvotanacetone); it has until now not been reported to occur in nature. Another rare compound detected was 4‐hydroxycarvotanacetone‐7‐ O ‐angelate (2%). An olfactographic analysis of the oil was also carried out. Chromatographic analyses of the essential oil of L. alata have not been reported previously.