Refluxing 2-Aryl-2,2-biindan-1,1,3,3-tetrones in acetic acid with urea produces 3-amino-2-(2- arylindanedionyl)indenones regioselectively within 2-3 h. in good yields. X-ray crystal structures of the products clearly indicate that in the solid state the compounds exist in the keto form. On the other hand NMR studies reveal that the enaminones exist in keto form in CDCl3 and in enol form in DMSO-d6 and acetone-d6.
在
醋酸中与
尿素回流反应2-芳基-2,2-双
茜菁-1,1,3,3-四酮,可以在2-3小时内区域选择性地产生3-
氨基-2-(2-芳基
茜菁二酮基)
茜菁酮,产率良好。产品的X射线晶体结构清晰表明,在固态下,化合物以酮形式存在。另一方面,NMR研究表明,酮
亚胺在CDCl3中以酮形式存在,而在
DMSO-d6和
丙酮-d6中以烯醇形式存在。