title: Structure elucidation of C80, C81 and C82 isoprenoid tetraacids responsible for naphthenate deposition in crude oil production.
abstract: A series of C(80) isoprenoid 20-bis-16,16'-biphytanyl tetraacids has previously been found to be responsible for calcium naphthenate scaling in crude oil processing. This paper describes the structure elucidation by high-field NMR spectroscopy of the structures of the series of homologous C(80) tetraacids containing 4-8 five-membered rings. In addition, the structures of methyl-substituted C(81) and C(82) analogues containing 7 and 8 five-membered rings have been determined for the first time. The biosynthetic implications are discussed.
authors.affiliation: Department of Chemistry, Norwegian University of Science and Technology NTNU, Trondheim, Norway. bjartl@chem.ntnu.no
authors.forename: Bjart F
authors.initials: BF
authors.lastname: Lutnaes
authors.forename: Jostein
authors.initials: J
authors.lastname: Krane
authors.forename: Ben E
authors.initials: BE
authors.lastname: Smith
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Rowland