• 제목/요약/키워드: Photoreactions

검색결과 34건 처리시간 0.016초

쿠마린과 푸로쿠마린의 광화학반응에 관한 연구 (Studies on the Photoreactions of Coumarins and Furocoumarins)

  • 심상철;임경란
    • 대한화학회지
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    • 제20권3호
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    • pp.236-239
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    • 1976

  • 광독성 물질인 쿠마린과 푸로쿠마린의 광화학반응을 분광분석, 삼중상태 켄칭, 형광법을 써서 연구하였다. 크산토톡신과 티민 또는 DNA 수용액의 광화학반응에서 ${\beta}$-카로텐을 켄치로 썼으나 아무런 켄칭이 일어나지 않는 것으로 보아 이 반응은 수명이 긴 크산토톡신의 삼중상태보다 수명이 짧은 들뜬 단일상태에서 일어나는 것으로 생각된다.

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An Intramolecular Photosubstitution Reaction of N-(2,4-Dibromonaphthyl)- arenecarboxamide: Synthesis of 2-Arylnaphthoxazole

  • Bae, In-Soo;Kim, Yoo-Shin;Park, Yong-Tae
    • Bulletin of the Korean Chemical Society
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    • 제24권7호
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    • pp.916-920
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    • 2003

  • Photoreactions of N-(2,4-dibromonaphthyl)arenecarboxamides in basic medium result in the intramolecular substituted products, 2-aryl-8-bromonaphthoxazoles in moderate yields and further photoreactions of the products afford the reduced products, 2-arylnaphthoxazoles. These reactions are straightforward for syntheses of naphthoxazole derivatives. Since the intramolecular photosubstitution of the bromoarenecarboxamide by the oxygen of its amide group is more effective than the photoreduction of the substituted product, 2-aryl-8- bromonaphthoxazole in basic medium, the intramolecular substituted product, 2-aryl-8-bromonaphthoxazole can be isolated. A charge-transfered excited singlet state of an imidol form of the 2-bromoarenecarboxamide is involved in the photosubstitution, whereas an excited triplet state of the 2-aryl-8-bromonaphthoxzole is closely involved in the photoreduction.

  • https://doi.org/10.5012/bkcs.2003.24.7.916 인용 PDF KSCI

Photoreactivity of $ReH_5$(Cyttp) (Cyttp=Php$(CH_2CH_2CH_2PCy_2)_2)$ with CO, $CO_2\;and\;PMe_3$

  • Lee, Myung-Young;Shin, Dae-Ho;Kim, You-Hyuk
    • Bulletin of the Korean Chemical Society
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    • 제15권7호
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    • pp.571-576
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    • 1994

  • The photoreactions of $ReH_5(Cyttp)\;(1)\;(Cyttp=PhP(CH_2CH_2CH_2PCy_2)_2)\;with\;CO,\;CO_2\;and\;PMe_3 has been investigated to find the differences in reactivities from those of trismonophosphine analog. Irradiation of 1 under CO, $CO_2$ and excess $PMe_3$ in benzene results in the formation of the complexes, $ReH(CO)_2(Cyttp)\;(2),\;ReH_2({\eta}^2-HCO_2)(Cyttp)\;(3)\;and\;$ReH_3(PMe_3)(Cyttp)$ (4), respectively. The resulting products suggest that photoreactions of $ReH_5(Cyttp)$ proceed by photoextrusion of $H_2$ giving a phototransient species "$ReH_3$(Cyttp)" which can be trapped by CO, $CO_2\;and\;PMe_3$. The structures of 2, 3 and 4 are inferred based on $^1H,\;^{31}P$ NMR and I. R spectroscopy.

  • https://doi.org/10.5012/bkcs.1994.15.7.571 인용 PDF

Photoreactions of (2-Alkoxymethylphenyl)pentamethyldisilanes

  • Park, Seung-Ki
    • Bulletin of the Korean Chemical Society
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    • 제27권9호
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    • pp.1305-1309
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    • 2006

  • Photolysis of (2-hydroxymethylphenyl)pentamethyldisilane 1 in methanol provides a novel intramolecular photoproduct 4 via silene intermediate 2 but the photoreaction of (2-acetoxymethyl- or allyloxymethylphenyl) pentamethyldisilanes 5 or 10 in methanol affords unexpected photoproducts 8 or 13, respectively, instead of expected intramolecular photoproducts.

  • https://doi.org/10.5012/bkcs.2006.27.9.1305 인용 PDF KSCI