Dye sensitized photooxygenation of imidazolin-2-ones
作者:H. Mohindra Chawla、Manisha Pathak
DOI:10.1016/s0040-4020(01)86697-7
日期:1990.1
Imidazolin-2-ones(-) on photooxygenation in the presence of methylene blue yielded the corresponding diacylureas as the only products isolated at room temperature. The rate of photooxygenation followed the order >>>>>. The reaction was also studied at pH 4.4, 6.0 and 9.2 as well as in solvents of varying dielectric constants to explore the nature of the intermediates. It appears that the reaction involves
The pteridin-2,4,7-trione 6,8'-endoperoxides are synthesized and their thermal reactions are examined. The pteridin-2,4,7-triones (1) reacted smoothly with singlet oxygen to yield the 6,8'-endopoothly with singlet oxygen to yield the pteridin-2,4,7-trione 6,8'-endoperoxides (2-5). On warming the endoperoxide (2a) reverted to the starting pteridin-2,4,7-trione (1a) with liberation of singlet oxygen, which was confirmed by trapping experiment using typical singlet oxygen acceptors (7-12).
Brazier; McCombie, Journal of the Chemical Society, 1912, vol. 101, p. 2354
作者:Brazier、McCombie
DOI:——
日期:——
CHAWLA, H. MOHINDRA;PATHAK, MANISHA, TETRAHEDRON, 46,(1990) N, C. 1331-1342