Table 1 Results of controlled ROP of various NCAs with [NHC(H)(HCO₃)]

Entry	NCA^a	[I]^b	p-NHC^c	[M]₀/[I]₀/[p-NHC]₀^d	Time (min)	Conv.^e (%)	M_n (kg mol⁻¹)			Đ ^g
Entry	NCA^a	[I]^b	p-NHC^c	[M]₀/[I]₀/[p-NHC]₀^d	Time (min)	Conv.^e (%)	Theo.^f	NMR^e	SEC^g	Đ ^g
1	1a	BnA	2b	50:1:0.2	5	53	3.6	1.9	n.d.^h	n.d.
2	1b	BnA	2b	50:1:0.2	5	42	5.7	2.4	n.d	n.d.
3	1c	HxA	2b	50:1:0.2	8	63	7.4	4.7	n.d	n.d.
4	1d	OtA	2b	50:1:0.2	8	67	9.7	6.5	n.d	n.d.
5	1e	HxA	2b	100:1:0.2	15	79	22.8	18.0	20.2	1.23
6	1g	HxA	2b	100:1:0.2	10	99	22.0	21.8	21.3	1.10
7	1f	HxA	2b	50:1:0.2	20	98	13.2	12.9	14.6	1.17
8	1f	PE	2b	50:1:0.2	30	94	13.8	13.0	n.d	n.d.
9	1g	HxA	2a	100:1:0.2	10	98	22.0	21.7	22.5	1.17
10	1g	HxA	2c	100:1:0.2	10	97	22.0	21.4	20.7	1.25
11	1g	HxA	2d	100:1:0.2	10	96	22.0	21.1	22.9	1.20
12	1f	HxA	2b	50:1:0.5	20	96	13.2	12.4	13.9	1.18
13	1f	HxA	2b	50:1:1	20	97	13.2	12.8	14.4	1.19
14	1d	―	2b	20:0:1	5	27	4.0	1.1	n.d.	n.d.
15	1c	―	2b	20:0:1	7	55	3.0	1.7	n.d	n.d.
16	1a	―	2b	50:0:1	9	78	3.7	2.9	n.d	n.d.
17	1g	―	2b	20:0:1	10	96	4.5	4.3	4.4	1.24
18	1g	―	2b	50:0:1	10	96	11.1	10.7	10.6	1.15
19	1g	―	2b	80:0:1	20	97	17.6	17.0	19.4	1.18
20	1g	―	2b	100:0:1	10	96	22.1	21.2	23.6	1.18
21	1f	―	2b	100:0:1	20	81ⁱ	26.3	―	21.2ⁱ	1.30
22	1g	―	2b	200:0:1	60	85	43.9	37.1	42.5	1.15
23	1g	―	2b	300:0:1	60	77	65.8	51.2	40.7	1.13

^aAll polymerizations were carried out in DMF, except for that with PE, which was dissolved in CHCl₃/DMF solution. [M]₀ = 0.2 M for all polymerizations.
^bBnA (benzylamine), HxA (n-hexylamine), OtA (n-octylamine), and PE (phosphatidylethanolamine) were introduced to entries 1–13 respectively
^cType of [NHC(H)(HCO₃)] as shown in Fig. 1, denoted as p-NHC
^d[M]₀/[I]₀/[p-NHC]₀ represents the initial molar ratio of the components
^eConversion and experimental MWs were calculated from the ¹H NMR spectrum
^fTheoretical MWs were calculated from the initial molar ratio assuming a single site initiation and complete conversion
^gPolydispersity index determined by SEC calibrated with polystyrene standards
^hNot detected due to the low solubility in DMF
ⁱCalculated by SEC because methyl peak of 2b overlapped with alkyl side chain of 1f in ¹H NMR spectrum

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