title: Two novel naturally occurring alpha-methoxy acids from the phospholipids of two Caribbean sponges.
abstract: The novel (5Z)-2-methoxy-5-hexadecenoic acid (1) was identified in the phospholipids of the sponge Tethya crypta while the also novel acid (6Z)-2-methoxy-6-hexadecenoic acid (2) was found in the phospholipids of the Caribbean sponge Spheciospongia cuspidifera. The methoxy-fatty acids were mainly associated with phosphatidylethanolamine. The double bond positions were determined by gas chromatography/mass spectrometry on the corresponding dimethyl-disulfide adducts and the double bond stereochemistry was ascertained by gas chromatography/Fourier transform infrared spectroscopy. The fatty acid composition of the two sponges is reported.
authors.affiliation: Department of Chemistry, University of Puerto Rico, Rio Piedras 00931.
authors.forename: N M
authors.initials: NM
authors.lastname: Carballeira
authors.forename: J A
authors.initials: JA
authors.lastname: Sepúlveda
mesh_terms: D000818:Animals; D005231:Fatty Acids, Unsaturated / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D010714:Phosphatidylethanolamines / Q000737:chemistry*; D011161:Porifera / Q000737:chemistry*
chemical_list: D005231:Fatty Acids, Unsaturated; D010714:Phosphatidylethanolamines