Photolysis of 5,5-dimethyl-4-phenyl-Δ-1,2,4-triazolin-3-one. Fragmentation to nitrogen, carbon monoxide, and isopropylidene phenyl amine
Keyword(s):
Photolysis of 5,5-dimethyl-4-phenyl-Δ1-1,2,4-triazolin-3-one (2) produces the same products as thermolysis; namely, nitrogen, carbon monoxide, and isopropylidene phenyl amine (acetone anil). The quantum yield for direct photolysis of 2 in methanol with 313 nm light is 0.066. Sensitization with benzophenone in the same solvent, and quenching with 1,3-cyclohexadiene, revealed that photolysis of 2 involves a triplet excited state. The most likely photo processes are thought to involve initial cleavage of the C3—N4 bond or the C3—N2 bond (Norrish, type 1 cleavage).
Keyword(s):
1990 ◽
Vol 68
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pp. 1685-1692
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2005 ◽
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pp. 1163-1164
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2021 ◽
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