Structure elucidation of C80, C81 and C82 isoprenoid tetraacids responsible for naphthenate deposition in crude oil production.
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.
Lutnaes
Bjart F
BF
Department of Chemistry, Norwegian University of Science and Technology NTNU, Trondheim, Norway. bjartl@chem.ntnu.no
Krane
Jostein
J
Smith
Ben E
BE
Rowland
Steven J
SJ