bearing an ortho-(tert-butyl)-NNO-azoxy group. BTOs bearing electron-releasing substituents were obtained by nucleophilic displacements of bromine in 4b−d. The formation of the BTO cyclic system involves the intermediate 2-(tert-butyl)-1,2,3,4-benzotetrazinium 4-oxides, which arise from an N,N-[1,2]-shift of the tert-butyl group. Decomposition of BTOs involves opening of the tetrazine ring to afford ortho-azidonitroso
描述了 1,2,3,4-苯并四嗪 1-氧化物 (BTO) 的合成。Bromo-BTO 4b-d 是通过带有邻(叔丁基)-NNO-偶氮氧基的重氮盐的分子内环化制备的。带有电子释放取代基的 BTO 通过
溴在 4b-d 中的亲核置换获得。BTO 环状体系的形成涉及中间体 2-(叔丁基)-1,2,3,4-苯并四嗪 4-氧化物,其产生于叔的 N,N-[1,2]-位移。丁基。BTO 的分解涉及打开四嗪环以提供邻-
叠氮基亚硝基衍
生物,然后随着 N2 分子的演化将它们环化以得到
苯并呋喃。(© Wiley-
VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)