Far ultraviolet induced decomposition of thymine in deaerated and aerated aqueous solutions

Autor:	Sei-ichi Nishimoto, Koichi Sakano, Hiroshi Nagasaki, Tsutomu Kagiya, Bunsho Ohtani
Rok vydání:	1986
Předmět:	chemistry.chemical_compound Aqueous solution Chemistry Far ultraviolet Organic Chemistry Quantum yield General Chemistry Aeration Photochemistry Decomposition Quantum Catalysis Thymine
Zdroj:	Canadian Journal of Chemistry. 64:2297-2300
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v86-376
Popis:	Thymine in aqueous solution was decomposed with quantum yields of 0.3 and 0.4 under N2-saturated and aerated conditions by far-ultraviolet light (> 180 nm, far-uv), and quantum yields of 2 × 10−4 and 3 × 10−4 by near-ultraviolet light (> 220 nm, near-uv), respectively. The main photolytic products by far-uv were 5,6-dihydrothymine (DHT) (selectivity: S (DHT) = 0.2) and 5-hydroxymethyluracil (HMU) (S(HMU) = 0.1) under N2-saturated conditions, cis- and trans-5,6-Dihydroxy-5,6-dihydrothymine (TG), 6(5)-hydroperoxy-5(6)-hydroxy-5,6-dihydrothymine (HTP) (S(TG) + S (HTP) = 0.2), and N1 -formyl-N2-pyruvylurea (FPU) (S(FPU) = 0.4) were obtained under aerated conditions. These products were attributed to the reactions of thymine with the H and OH produced by photolysis of water.
Databáze:	OpenAIRE
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