Essentially complete analyses are reported of the sesquiterpene fractions from the leaf oils of Pinus l o n g i f o l i a , P. pinaster, P. t h u n b e r g i i , P. d e n s iflora, C h a m a e c y p a r i s n o o t k a t e n s i s and C. o b t u s a and of oil from the liverwort S cap a n ia u n d u 1 a t a. These species have been recorded as sources of longi/olene and related compounds but the present results differ considerably from those of the previous (often incomplete) analyses. The best sources of longifolene and its relatives were P. p i n a st e r and S. u n d u 1 at a (1 6; 46 O/o of the steam volatile oil respectively) and enantiomorphic compounds were found in the two species. lntroduction Longifolene (I: decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene) is a sesquiterpene with an unusual skeleton that occurs in the natural orders Pinales, Cupressales, and Podocarpales (cf. AKIYOSHI et al., 1960;ZAVARIN et al., 1968); its main source, namely Pinus longifolia, is used in the Indian subcontinent in folk medicine (CHAUDHRY, 1974). Related sesquiterpenes which by analogy with monoterpenes may be classified as members of the longibornane series, are longi-borne01 (11), longicamphor (111), longicyclene (IV) and a-longipinene (V) (cf. VON SCHANTZ and JUVONEN, 1967;SMEDMAN et al. 1969 a, b;and NAYAK and DEV, 1963); these are infrequently found in nature and are always present in smaller proportions than the co-occurring longifolene (Figure 1).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.