convenient and efficient method has been developed for the synthesis of nitronecompounds. Nitrone derivatives were synthesized in good yields via a green chemistry procedure using diaminoglyoxime and aldehyde or ketones in the presence of ZnO nanoparticles (NPs) as a catalyst in H2O as a solvent at room temperature. After the reaction course, ZnO NPs can be recycled and reused without any apparent loss
The reaction of diaminoglyoxime with aldehyde and ketone derivatives in the presence of p-toluene sulphonic acid in H2O–MeOH mixture at room temperature afforded nitrone derivatives in high yields within 10–140 min. The applicability of ketones in this reaction for the preparation of novel nitrones has been verified. The effect of the temperature on the stability of the structural isomers of the products
在室温下,在H 2 O-MeOH混合物中,在对甲苯磺酸存在下,二氨基乙二肟与醛和酮衍生物的反应在10–140分钟内以高收率得到了硝酮衍生物。已证实酮在该反应中可用于制备新的硝酮。还通过NMR研究了温度对产物的结构异构体的稳定性的影响。结果表明,在高温下只能观察到一种产物。对溶剂和催化剂的性质进行了评估,发现质子溶剂CH 3中的强酸H 2 SO 4和CF 3 SO 3 HOH的效果很好,而质子溶剂中的CH 3 SO 3 H和质子惰性溶剂中的对甲苯磺酸甲苯和THF均无法进行相同的反应。