116751-88-3Relevant academic research and scientific papers
Photoinduced Molecular Rearrangements. Some Investigations of the Photochemical Behavior of 3-(Acylamino)-1,2,5-Oxadiazoles (Furazans)
Buscemi, Silvestre,Vivona, Nicolo,Caronna, Tullio
, p. 4096 - 4101 (2007/10/02)
Mechanistic investigations of the photochemical behavior of some 3-(acylamino)-1,2,5-oxadiazoles (furazans) are reported.Irradiations of 3-(aroylamino)-4-methyl- and 3-(acetylamino)-4-phenyl-furazans at λ = 254 nm in methanol, and in methanol containing pyrrolidine, are considered.Photochemical processes follow different routes depending on the actual chromophore in the photoreaction.In the irradiation of 3-(aroylamino)-4-methylfurazans, two photochemical pathways involving a different multiplicity of excited states suggested: cleavage of the ring O(1)-N(5) bond via a singlet excited state (developing into nitrile oxides or carbodiimides, from which final products arise), or preliminary ring-closure involving the aroylamino group via a triplet excited state, respectively.In the irradiation of 3-(acetylamino)-4-phenylfurazan, photolytic intermediates arising from the cleavage of both the O(1)-N(2) and O(1)-N(5) bonds develop into the final products by reaction with the nucleophilic species present.
Heterocyclic Photorearrangements. Photochemical Behaviour of Some 3,5-Disubstituted 1,2,4-Oxadiazoles in Methanol at 254 nm
Buscemi, Silvestre,Cicero, Maria G.,Vivona, Nicolo,Caronna, Tullio
, p. 931 - 935 (2007/10/02)
Photochemical behaviour of some 3,5-disubstituted 1,2,4-oxadiazoles in methanol at 254 nm has been investigated.Ring photoisomerization to the 1,3,4-oxadiazole heterocycle or formation of open chain compounds involving the nucleophilic solvent was shown to depend on the nature and the position of the substituent.Photoinduced ring closure into the benzimidazole system, involving a 3-N-phenylamino side chain sequence and a photolytic intermediate of the oxadiazole heterocycle, is also reported.
