Preparation of New α-Aminophosphonate Derivatives by Kabachnik-Fields Reaction Using a Recyclable Catalyst

Table 4

Antioxidant activity.

Compounds	% Scavenging activity at different concentrations
	25 µg/mL	50 µg/mL	100 µg/mL	250 µg/mL	500 µg/mL
4a	12.32	24.15	54.87	72.03	84.26
4b	7.05	14.25	23.57	42.1	66.32
4c	24.15	40.25	60.58	87.51	98.35
4d	7.61	17.25	29.45	39.25	61.23
4e	20.15	32.45	63.25	88.71	95.26
4f	12.89	20.45	29.87	38.26	42.1
4g	12.32	24.15	54.87	72.03	84.26
4h	24.15	40.25	60.58	87.51	98.35
4i	7.61	17.25	29.45	39.25	61.23
4j	20.15	32.45	63.25	88.71	95.26
4k	12.86	21.56	32.79	42.13	56.52
4l	10.23	22.83	33.56	51.23	62.81
4m	6.32	12.52	21.83	34.54	49.42
4n	3.25	11.59	20.94	33.54	46.23
4o	6.23	11.25	20.38	32.45	48.24
BHT	12.35	25.72	58.51	86.25	94.32

BHT: butylated hydroxytoluene.