Table 1 ROP of EVP using phosphazene/urea binary organocatalysts under different reaction conditions.^a

Run	Urea	EVP/Base/ Urea/BnOH	Time (h)	Conv.^b (%)	Select.^c (%)	M_n,GPC^d (kg·mol^-1)	Ð^d
1	DU8	50/1/1.5/1	8	30	100	1.5	1.42
2	U1	50/1/3/1	8	15	33	n.d.	n.d.
3	U2	50/1/3/1	8	23	57	1.1	1.68
4	U3	50/1/3/1	8	19	65	n.d.	n.d.
5	U4	50/1/3/1	8	36	47	n.d.	n.d.
6	U5	50/1/3/1	8	8	56	n.d.	n.d.
7	U6	50/1/3/1	8	22	100	1.3	1.2
8	U7	50/1/3/1	8	20	100	0.9	1.46
9	U8	50/1/3/1	8	22	100	1.1	1.61
10	U9	50/1/3/1	8	6	100	n.d.	n.d.
11	DU6	50/1/1.5/1	8	43	100	2.2	1.64
12	DU8	50/1/1.5/0.5	12	30	100	3.6	1.41
13	DU8	50/1/1.5/0.25	12	30	100	6.5	1.24
14	DU8	50/1/1.5/0.125	12	10	100	2.4	1.58
15	DU8	50/1/1.5/0.125	24	18	100	4.2	1.30
16	DU6	50/1/1.5/0.5	12	40	100	3.9	1.29
17	DU6	50/1/1.5/0.125	12	26	100	7.8	1.25
18	DU6	50/1/1.5/0.125	24	31	100	8.9	1.18
19^e	DU6	50/1/1.5/0.125	24	34	100	16.1	1.55

n.d. not determined.
^aConditions: 0.04 mmol CTPB, THF 0.14 mL, [EVP]₀ = 5 M, BnOH as the initiator, −50 °C.
^bDetermined by ¹H NMR.
^cPolymerization selectivity via ROP pathway determined by ¹H NMR.
^dDetermined by GPC at 40 °C in THF.
^e1,4-Benzenedimethanol (BDM) as the bifunctional initiator.

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