Etudes sur les matières végétales volatiles CLXVI. Présence de β‐déhydro‐elsholtzione dans l'huile essentielle d'Elsholtzia oldhami HEMSL

Abstract

Beside elsholtzione, the essential oil of Elsholtzia oldhami HEMSL. contains dehydro‐elsholtzione, which is a 3‐methyl‐2‐(3‐methyl‐1‐oxo‐2‐butenyl)‐furan.

Terpenoids from Elsholtzia Species; II. Constituents of Essential Oil from a New Chemotype ofElsholtzia cristata

“…2-Isovaleryl-3-methylfuran (16) is also reported to be present in the essential oils of other Elsholtzia species like E. oldhami (3,8), E. ciliata (11)(12)(13), and the E. cristata (3,4) which differs in its oil composition from the one investigated here.…”

“…The JR spectrum of the essential oil contained characteristic absorption bands at 3125 (C-H), 1580 and 1512 (heterocyclic), and at 885 cm1, known for furan derivatives (7), and at 1657 (C = 0) and 1616 (C = C), consistent with the spectrum of synthetic dehydroelsholtzia ketone (8). Furthermore, the 2,4-dinitrophenyl hydrazone of the major component was prepared (m.p.…”

“…Also, 13C-NMR spectroscopy was useful for their structural elucidation (3)(4)(5)(6). In the present paper, we describe the isolation and 13C-NMR studies on known furanoditerpenes, columbin (1), isocolumbin (2), palmarin (3), chasmanthin (4), jateorin (5), isojateorin (6), and new furanoditerpenyl glucosides, named columbinyl glucoside (7), jateorinyl glucoside (8), and isojateorinyl glucoside (9).…”

Constituents of Essential Oil ofElsholtzia strobilifera1

“…The constituents of the essential oils from various Elsholtzia species have been analysed and among others, terpenoids, unsaturated alcohols, carboxylic acids and esters have been identified. Acylfuran derivatives like elsholtziaketone ['= 2isovaleryl-3-methylfuran], a-dehydroelsholtziaketone [= 3methyl-2-(3-methylbut-3-enoyl)-furan] and f3-dehydroelsholtziaketone [= naginataketone, 3-methyl-2-(3-methylbut-2enoyl)-furan] are the characteristic compounds in E. ciliata (10), E. densa (11), E. oldhami (12) and E. patrini (13). Except our preliminary report (14) nothing has been reported on the chemical composition of the essential oil from E. strobilifera.…”

Mechanistic aspects of the biogenesis of rose oxide inPelargonium graveolens L'H�ritier

“…1 The structure was elucidated in 1961 by Seidel et al 2 Since that time rose oxide has been detected in many plants (e.g., Pelargonium spp., 3 Ribes nigrum L., 4 Cymbopogon winterianus Jowitt 5 ) and even in the liquid secretion of the wide-spread beetle Aromia moschata L. 6 Recently, it was shown that (−)-cisrose oxide 2 has a much lower odor threshold value than (+)-cis-1 and the trans-isomers 3,4. 2 contributes substantially to the unique bloomy green top notes of geranium and rose oils.…”