New heterocyclic ring systems consisting of (±) methanodibenzodiazocine and imidazolium/ benzimidazolium salts were synthesized in very good yield. Subsequently, these halide salts were subjected to the anion exchange reaction with KPF6 to yield the corresponding azolium salts in excellent yield. The possible applications of these newly prepared salts were investigated in homogeneous catalysis. Remarkable changes in the catalytic activity were observed by varying the bulkiness of N-substituent at imidazole. Catalytic activity of these newly prepared salts was tested for the benzoin condensation reaction. Exclusive formation of benzoin products were observed in good yield. Similarly, the dimerization of cyclohexen-1-one to Baylis-Hillman type product, 2-(3-oxocyclohexyl)-2-cyclohexen-1-one was studied.
新合成的杂环环系由(±)
甲烷二苯并二氮杂烯及
咪唑盐/苯
咪唑盐组成,得率非常好。随后,这些卤盐与KPF6进行阴离子交换反应,生成相应的杂环阳离子盐,得率极佳。研究了这些新制备盐类在均相催化中的潜在应用。通过改变
咪唑中N取代基的体积,观察到催化活性发生显著变化。这些新制备盐的催化活性被测试于苯偶弧反应中,观察到苯偶弧产物的专一性形成且得率良好。同样,研究了
环己烯-1-酮二聚化反应,生成Baylis-Hillman类型的产物2-(3-氧基环己基)-
2-环己烯-1-酮。