Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol
Апстракт
Ultraviolet light-induced photochemical transformations of coniferyl alcohol have been studied, using spectrophotometric and H-1 NMR approaches. It was shown earlier that coniferyl alcohol can be polymerized not only enzymically but also by photoirradiation, This study furthers our knowledge on the UV radiation-induced polymerization of coniferyl alcohol. In the photochemical reaction of coniferyl alcohol, quinone-methide is the first transient formed. In subsequent reactions quinone-methide produces dimers, oligomers and a polymer as the end product. The reaction rate constants are pH dependent. The results are interpreted in terms of an ionic mechanism of the photochemical reaction, contrary to enzymic polymerization that involves formation of phenoxy radicals. The study may have ecological importance because of the increase of UV radiation reaching the earth's surface due to ozone layer depletion.
Кључне речи:
coniferyl alcohol / UV radiation / polymerization / UV-Vis absorption spectroscopy / 1H NMR spectroscopyИзвор:
Photochemistry and Photobiology, 1997, 65, 2, 284-291Издавач:
- Blackwell Publishing Inc.
Институција/група
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Radotić, Ksenija AU - Zakrzewska, Joanna AU - Sladic, Dusan AU - Jeremic, M. PY - 1997 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/36 AB - Ultraviolet light-induced photochemical transformations of coniferyl alcohol have been studied, using spectrophotometric and H-1 NMR approaches. It was shown earlier that coniferyl alcohol can be polymerized not only enzymically but also by photoirradiation, This study furthers our knowledge on the UV radiation-induced polymerization of coniferyl alcohol. In the photochemical reaction of coniferyl alcohol, quinone-methide is the first transient formed. In subsequent reactions quinone-methide produces dimers, oligomers and a polymer as the end product. The reaction rate constants are pH dependent. The results are interpreted in terms of an ionic mechanism of the photochemical reaction, contrary to enzymic polymerization that involves formation of phenoxy radicals. The study may have ecological importance because of the increase of UV radiation reaching the earth's surface due to ozone layer depletion. PB - Blackwell Publishing Inc. T2 - Photochemistry and Photobiology T1 - Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol EP - 291 IS - 2 SP - 284 VL - 65 UR - https://hdl.handle.net/21.15107/rcub_cherry_2586 ER -
@article{ author = "Radotić, Ksenija and Zakrzewska, Joanna and Sladic, Dusan and Jeremic, M.", year = "1997", abstract = "Ultraviolet light-induced photochemical transformations of coniferyl alcohol have been studied, using spectrophotometric and H-1 NMR approaches. It was shown earlier that coniferyl alcohol can be polymerized not only enzymically but also by photoirradiation, This study furthers our knowledge on the UV radiation-induced polymerization of coniferyl alcohol. In the photochemical reaction of coniferyl alcohol, quinone-methide is the first transient formed. In subsequent reactions quinone-methide produces dimers, oligomers and a polymer as the end product. The reaction rate constants are pH dependent. The results are interpreted in terms of an ionic mechanism of the photochemical reaction, contrary to enzymic polymerization that involves formation of phenoxy radicals. The study may have ecological importance because of the increase of UV radiation reaching the earth's surface due to ozone layer depletion.", publisher = "Blackwell Publishing Inc.", journal = "Photochemistry and Photobiology", title = "Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol", pages = "291-284", number = "2", volume = "65", url = "https://hdl.handle.net/21.15107/rcub_cherry_2586" }
Radotić, K., Zakrzewska, J., Sladic, D.,& Jeremic, M.. (1997). Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol. in Photochemistry and Photobiology Blackwell Publishing Inc.., 65(2), 284-291. https://hdl.handle.net/21.15107/rcub_cherry_2586
Radotić K, Zakrzewska J, Sladic D, Jeremic M. Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol. in Photochemistry and Photobiology. 1997;65(2):284-291. https://hdl.handle.net/21.15107/rcub_cherry_2586 .
Radotić, Ksenija, Zakrzewska, Joanna, Sladic, Dusan, Jeremic, M., "Study of photochemical reactions of coniferyl alcohol .1. Mechanism and intermediate products of UV radiation-induced polymerization of coniferyl alcohol" in Photochemistry and Photobiology, 65, no. 2 (1997):284-291, https://hdl.handle.net/21.15107/rcub_cherry_2586 .