dihydrobenzofurazan-4-one 1-oxides (10a)–(15a) are converted almost completely into the isomeric 3-oxides (10b)–(15b), respectively, on heating. Rate and equilibrium constants for the reaction have been determined. Some chemical transformations of the ketones are described. The dihalogeno-ketones (13) and (14)(a and b) display broadened n.m.r. signals at room temperature, due to slow equilibration between the ‘half-chair’
加热时,二氢
苯并呋喃赞喃四酮1-氧化物(10a)–(15a)几乎完全转化为异构体3-氧化物(10b)–(15b)。已经确定了反应的速率和平衡常数。描述了酮的一些
化学转化。由于“半椅子”构象异构体之间的平衡缓慢,二卤代酮(13)和(14)(a和b)在室温下显示出较宽的核磁共振信号。