Table 2. Screening of Catalysts C1–C8 in MMA R-ATRP^a.

entry	complex	init.	conv. (%)	Mn,th (Da)	Mn (Da)	D̵
1	C1	AIBN	28	2800	8400	1.1
2		V-70	30	3000	13 000	1.2
3	C2	AIBN	76	7600	17 000	1.8
4		V-70	66	6600	18 900	2.3
5	C3	AIBN	47	4700	12 700	1.6
6		V-70	24	2400	18 800	1.5
7	C4	AIBN	85	8500	18 400	1.4
8		V-70	68	6800	15 700	1.4
9	C5	AIBN	61	6100	16 700	2.2
10		V-70	54	5400	16 500	1.9
11	C6	AIBN	65	6500	22 800	1.4
12		V-70	62	6200	14 900	1.4
13	C7	AIBN	68	6800	18 900	1.7
14		V-70	62	6200	19 400	1.6
15	C8	AIBN	64	6400	16 100	1.8
16		V70	63	6300	16 400	1.4

^aConditions: [MMA]/[Fe^III]/[I] = 100:1:0.6, MMA/toluene = 1:1 (v/v), 120 °C for AIBN or 75 °C for V-70, 2 h. Conversion was determined using ¹H NMR spectra of crude reaction mixtures. M_n,th [Fe] = [MMA]₀/[Fe] × M(MMA) × conversion.