124855-86-3Relevant academic research and scientific papers
Photochemical Dehydrogenation, Ring Contraction, and Ring Expansion of Hydrogenated Derivatives of Benzoxazino-benzoxazine, Quinoxalino-quinoxaline, and Bibenzothiazole
Tauer, Erich,Grellmann, Karl-Heinz
, p. 1149 - 1154 (2007/10/02)
The photochemical properties of the title compounds have been investigated and compared.The benzoxazino-benzoxazine derivatives 1 are photochemically converted into hydrogenated oxazolo derivatives.In some cases this ring contraction is accompanied by a dehydrogenation reaction whereby the heterocyclic ring system becomes aromatic.Hydrogenated quinoxalino-quinoxalines also undergo a photodehydrogenation reaction and become aromatic.However, a ring contraction yielding the the imidazolyl system does not take place.The only investigated sulfur-containing analog has different properties.The stable form is the bibenzothiazole 23 which contains a five-membered heterocyclic ring system.Photochemically 23 rearranges under ring expansion to give the benzothiazino-benzothiazine 24.
