• Title, Summary, Keyword: photochemical and thermal reaction mechanism

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Photochemical and Thermal Reaction Mechanism for the Reaction of Carcinogenic Molecules and Food Reservatives (발암성 분자와 식품보존제의 광화학 및 열적 반응메카니즘)

  • 김민식;채기수;김갑순;성대동
    • The Korean Journal of Food And Nutrition
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    • v.11 no.3
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    • pp.267-271
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    • 1998
  • The photochemical carcinogenic reaction mechanism and molecular carcinogenic intensity through the reaction of dibromo carbene and diazomethane with dehydroacetic acid and coumarin have been studied under the two kinds of photolysis. The reaction intensities show the degree of carcinogenic activity. Under the condition of UV/vis light source, the yield of high toxic carcinogenetic carbene intermediate is produced less than those of the laser flash photolysis.

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Photochemical Synthesis of Aspartylphenylalanyl Methyl Ester (광 알킬화 반응에 의한 Aspartylphenylalanyl Methyl Ester의 합성)

  • Sang Chul Shim;Kyu Ho Chae
    • Journal of the Korean Chemical Society
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    • v.19 no.5
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    • pp.367-374
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    • 1975
  • Glycine residue in N-X-glycylphenylalanine methyl ester(X = trifluoroacetyl or acetyl) was converted into aspartic acid derivative by a photoalkylation reaction. The reaction was induced with 350 nm lamp using a combination of diacetyl/di-t-butyl peroxide (DBP) as the photoinitiator, and acetic anhydride as the alkylating agent. In the thermal reaction with DBP and acetic anhydride, the same alkylation reaction of the dipeptide was observed. From this thermal alkylation reaction the photoalkylation reaction is also thought to undergo via free radical mechanism.

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Reaction and Characterization of Silylene and its Precusor (Silylene과 Silylene 전구체의 반응 특성 연구)

  • Kong, Young Kun;Ahn, Young Man
    • Analytical Science and Technology
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    • v.7 no.3
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    • pp.321-327
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    • 1994
  • The mild thermal decomposition of 7, 7-dimethyl-1, 2, 3, 4, 5-pentaphenyl-7-silanorbornadiene with excess methyl alcohol proceeds to give 1-methoxydimethylsilyl-1, 2, 3, 4, 6-pentaphenylcyclohexa-2, 5-diene which is colorless needle crystal. The cophotolysis of the solution of 7-silanorbornadiene in the excess ethyl alcohol proceeds with loss of silylenes to give ethoxydimethylsilane which is insertion reaction product of silylene with O-H bond of ethyl alcohol. According to above results, it is presumed that the mechanism of photochemical decomposition and that of mild thermochemical decomposition of 7-silanorbornadiene are different.

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