Table 1 Catalyst evaluation in the atom-transfer radical polymerization of MMA.

Entry	PC	Initiator	Solvent	Conv. (%)	M_{n, theo} (kDa)	M_{n, GPC} (kDa)	Ɖ
1	5a	EBP	DMA	88.5	9.10	19.9	1.34
2	5a	EBP	DMF	83.4	8.59	18.3	1.33
3	5a	EBP	DCM	73.3	7.58	12.8	1.25
4	5a	EBrP	DCM	72.7	7.46	13.3	1.27
5	5a	EBiB	DCM	78.2	8.02	14.9	1.23
6	5a	DBM	DCM	80.8	8.33	13.7	1.22
7	5a	DBMM	DCM	81.2	8.38	12.8	1.19
8	5b	EBP	DCM	66.5	6.90	12.3	1.19
9	5c	EBP	DCM	79.2	8.17	13.8	1.22
10	5d	EBP	DCM	88.2	9.07	13.5	1.23
11	5b	DBMM	DCM	69.1	7.17	13.5	1.15
12	5d	DBMM	DCM	84.8	8.75	12.0	1.12
13^a	5a	EBP	DCM	82.7	8.52	15.7	1.25
14^a	5d	DBMM	DCM	71.8	7.44	10.9	1.15

Reaction conditions: [MMA]₀:[initiator]₀:[PC]₀ = 100:1:0.05, solvent (9.4 M of MMA), at room temperature, under the irradiation of purple LEDs (400 nm, 25 mW cm^–2), 10 h. Conversions were determined by ¹H NMR. M_n and Ɖ were determined by GPC with polymethyl methacrylate (PMMA) standards. Abbreviations: MMA methyl methacrylate, PC photocatalyst, Conv. conversion, GPC gel permeation chromatography, Ɖ = M_w/M_n, EBP ethyl α-bromophenylacetate, EBrP ethyl-bromopropanoate, EBiB ethyl-2-bromoisobutanoate, DBM diethyl 2-bromomalonate, DBMM diethyl 2-bromo-2-methylmalonate, DMA dimethylacetamide, DMF dimethylformamide, DCM dichloromethane. ^aIrradiated by blue LEDs (460 nm, 30 mW cm⁻²), 8 h.

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