Table 3 Catalyst effect on the click polymerization of 1a and 2a^a

no.	catalyst	solvent	yield (%)	M _w ^b	PDI^b	S^c	[Cu] (ppm)^d
1	CuI@A-21	THF	78.0	48 900	1.74	√	116
2	CuSO₄/SA^e	THF	97.4	88 400	1.83	Δ	2792
3	CuI	DMF	69.4	44 800	1.67	Δ	3088
4	Cu(PPh₃)₃Br	THF	86.9	25 700	2.04	√	3197

^aCarried out at 60°C for 12 h under nitrogen with a monomer concentration of 0.1 M.
^bM_w and PDI of polymer were estimated by GPC in THF on the basis of a PS calibration.
^cSolubility in THF, √ = completely soluble, Δ = partially soluble.
^dCopper residue in the polymer estimated by atomic absorption spectroscopy.
^eSA = sodium ascorbate.

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