COA of Formula: C8H7N3O. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Heterocyclic photorearrangements. Some investigations of the photochemical behavior of 3-acylamino-1,2,4-oxadiazoles. Synthesis of the quinazolin-4-one system. Author is Buscemi, Silvestre; Vivona, Nicolo.
Some mechanistic investigations on the photochem. behavior of 1,2,4-oxadiazoles are reported. Irradiation of 3-benzoylamino-5-methyl-1,2,4-oxadiazole at λ = 254 nm in methanol involves excitation of the benzoylamino group chromophore to a triplet state species and induces a 6π electrocyclic closure to a tricyclic intermediate. On the other hand, irradiation of 3-acetylamino-5-phenyl-1,2,4-oxadiazole at λ =254 nm involves excitation of a 5-phenyl-substituted oxadiazole chromophore which leads to the photolysis of the ring O-N bond in a singlet state species. Furthermore, irradiation of some selected 5-Ph substituted oxadiazoles in the presence of a triplet sensitizer produces an excited triplet state species which collapses in a ring closure reaction involving the C5-Ph moiety.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis