STUDIES ON CONSTITUENTS IN CYPERACEAE .4. CONSTITUENT OF THE ESSENTIAL OIL FROM CYPERUS-PILOSUS VAHL

In the course of a study on essential oils of the cyperaceae, essential oils from roots of Onigayatsuri (Cyperus ptiostis Vahl) was studied. The yields of the oils were 0.023~0.339%, and the oils were separated into individual compounds by means of combination of elution chromatography and distillation or of gas chromatography (GC). The structure of a new compound separated was determinded based on chemical and spectral evidence. The new compound was dimethyl ester of a novel terpenic dibasic acid (1], dimethyl (2E, 6 E, 10 E)-3, 7, ll-trimethyl-2, 6, 10-dodecatrienedioate, and the oils contained 41.1~69.1% of [1]. On the other hand, identification of the known compounds was performed based on comparison of the retention time of GC and of mass spectra with those of the authentic specimens. Main components were cyperene, β-selinene, α-cadinol, (2E, 6E)-farnesol, methyl (2Z, 6E)-farnesate, methyl (2E, 6Z)-farnesate, new ester [1], and normal alkanes (C19H40, C21H44, C22H46 C23H48)-Minor ones were caryophyllene, juniper camphor, (2E, 6 E)-farnesyl acetate, methyl parmhate, and normal alkanes (C17H36, C18H38 C20H42, C24H50, C25H52). © 1979, The Chemical Society of Japan. All rights reserved.