Formation of Pyridazinium Salts by Azo Coupling ofN-Substituted 3-Amino-1-phenylbut-2-en-1-ones and Diazonium Salts
作者:Petr ?im?nek、Mark�ta Pe?kov�、Valerio Bertolasi、Anton�n Ly?ka、Vladim�r Mach�?ek
DOI:10.1002/ejoc.200400287
日期:2004.12
benzenediazonium tetrafluoroborates gives, besides the usual azo coupling products [i.e., 3-(substituted imino)-1-phenylbutane-1,2-diones 2-(4-substituted phenylhydrazones) and 2-(4-methoxyphenyldiazenyl)-3-methylamino-1-phenylbut-2-en-1-one, respectively], the previously unreported 1,4,5,6-tetrasubstituted pyridazinium tetrafluoroborates. The pyridazinium salts have been identified by X-ray analysis and by their
用一些重氮四氟硼酸盐处理 3-(2,4-二甲氧基苯基氨基)-和 3-甲基氨基-1-苯基丁-2-烯-1-酮,除了通常的偶氮偶联产物 [即 3-(取代亚氨基)- 1-苯基丁烷-1,2-二酮 2-(4-取代苯腙) 和 2-(4-甲氧基苯基二烯基)-3-甲氨基-1-苯基丁-2-en-1-one], 以前未报道的 1, 4,5,6-四取代哒嗪鎓四氟硼酸盐。哒嗪盐已通过 X 射线分析和它们的 1H、13C、15N、11B 和 19F NMR 谱进行鉴定。它们的形成很可能是腙基团的氮对羰基碳的亲核攻击和随后脱水的结果。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)