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Can I read High-performance Liquid Chromatography and Proton Nuclear Magnetic Resonance of Eleven Isomers of Methyl Retinoate on EtoBox?
High-performance Liquid Chromatography and Proton Nuclear Magnetic Resonance of Eleven Isomers of Methyl Retinoate by B.A. Halley; E.C. Nelson is a Chemistry article available to read on EtoBox.
What is High-performance Liquid Chromatography and Proton Nuclear Magnetic Resonance of Eleven Isomers of Methyl Retinoate about?
Methyl all-tmns-retinoate was isomerized with fluorescent light in either heptane, acetonitrile or dimethyl sulfoxide. Eleven isomers of methyl rerinoate were produced during irradiation in dimethyl sulfoxide. The isomers were purified by highperformance liquid chromatography (HPLC) using reversed-phase columns and were characterized by proton nuclear magentic resonance and chemical methods. They were identified as the methyl esters of a 13-c&(5 +-IO)-photocyclized isomer, the 9,11,13-tri-cis-, 11,13-di-cir-, 7,13-di-cis, 13-c%, 9,13-di-cis-, a 13-riwrs-(5 -+ lO)photocyclized isomer, the 1 l-c&, 9-c&, 7-&r-and all-frans-isomers of retinoic acid. After prolonged irradiation in polar solvents, the two photocyclized isomers accumulated until they were the only two observable isomers in the HPLC pattern. The rate of disappearance of the all-rralzs-isomer increased as solvent polarity increased. Only seven isomers were produced by irradiation in heptane.
Who reads High-performance Liquid Chromatography and Proton Nuclear Magnetic Resonance of Eleven Isomers of Methyl Retinoate?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- B.A. Halley; E.C. Nelson
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)
- Published
- 1979
- Language
- EN
- Field
- Chemistry (Physical Sciences)