The reaction between 2-(2-phenylethynyl)aniline and carbon dioxide on heterogeneous Ag-containing catalysts can lead either to benzoxazine-2-one or to 4-hydroxyquinoline-2(1Н)-one, depending on the reaction conditions (nature of the base, CO2 pressure). The structures of the products were confirmed by 1Н and 13С NMR spectroscopy. The maximum yield of the products (60 and 30% for benzoxazine-2-one and 4-hydroxyquinolin-2(1Н)-one, respectively) is achieved on the catalyst Ag(1%)/γ-Al2O3(F). According to the results of physicochemical studies, the high activity of the catalysts in the reactions proceeding via triple bond activation results from the combination of three factors. First, the catalyst contains metallic silver particles with the size >2 nm; second, metallic silver particles coexist with silver cations; and third, strong acid sites are present on the support surface.
2-(2-
苯乙炔基)
苯胺与
二氧化碳在含
银的异相催化剂上反应,可以产生苯噁嗪-2-酮或
4-羟基喹啉-2(1Н)-酮,具体取决于反应条件(碱的性质,
CO2压力)。产物的结构通过1Н和13С NMR光谱得到了确认。在催化剂Ag(1%)/γ-
Al2O3(F)上,产物的最大产率(苯噁嗪-2-酮和
4-羟基喹啉-2(1Н)-酮的产率分别为60%和30%)得以实现。根据物理
化学研究的结果,催化剂在通过三重键活化反应中的高活性源于三个因素的结合。首先,催化剂中含有粒径大于2纳米的
金属
银颗粒;第二,
金属
银颗粒与
银阳离子共存;第三,支持表面存在强酸性位点。