Epoxidation ofLesquerella andLimnanthes (Meadowfoam) oils |
| |
Authors: | Kenneth D Carlson Robert Kleiman Marvin O Bagby |
| |
Affiliation: | (1) New Crops Research, USDA, NCAUR, 1815 N. University, 61604 Peoria, Illinois |
| |
Abstract: | Lesquerella gordonii (Gray) Wats andLimnanthes alba Benth. (Meadowfoam) are species being studied as new and alternative crops. Triglyceride oil from lesquerella contains 55–60%
of the uncommon 14-hydroxy-cis-11-eicosenoic acid. Meadowfoam oil has 95% uncommon acids, includingca. 60%cis-5-eicosenoic acid. Both oils are predominantly unsaturated (3% saturated acids), and have similar iodine values (90–91),
from which oxirane values of 5.7% are possible for the fully epoxidized oils. Each oil was epoxidized withm-chloro-peroxybenzoic acid, and oxirane values were 5.0% (lesquerella) and 5.2% (meadowfoam). The epoxy acid composition of
each product was examined by gas chromatography of the methyl esters, which showed that epoxidizedL. gordonii oil contained 55% 11,12-epoxy-14-hydroxyeicosanoic acid, and epoxidized meadowfoam oil contained 63% 5,6-epoxyeicosanoic
acid, as expected for normal complete epoxidation. Mass spectrometry of trimethylsilyloxy derivatives of polyols, prepared
from the epoxidized esters, confirmed the identity of the epoxidation products and the straightforward nature of the epoxidation
process. Synthesis and characterization of these interesting epoxy oils and derivatives are discussed. |
| |
Keywords: | Epoxidation epoxidized lesquerella oil epoxidized meadowfoam oil fatty di- tri- and tetraols GC GC-MS Lesquerella gordonii Limnanthes alba meadowfoam m-Cl-peroxybenzoic acid methyl (5 6 13 14-diepoxy decosanoate 5 6-epoxy docosanoate 13 14-epoxy docosanoate 5 6-epoxy eicosanoate 11 12-epoxy-14-hydroxy eicosanoate diastereomers TMS derivatives |
本文献已被 SpringerLink 等数据库收录! |
|