Block copolymerization of IP and CL with pre-catalyst 6^a.

Entry	Feed ratio (IP : CL)	Conv.b (%)	M n c (kDa)	Đ c	Poly(1,3-diene) : polyesterd,e (%)	Microstructuree,fCis-1,4/Trans-1,4/3,4	T g g , h (°C)	T m g , h (°C)
1	800 : 300	>99	110(21)	1.10(2)	68 : 32	51/48/1	−66	51
2	550 : 550	>99	90.9(17)	1.12(1)	47 : 53	44/54/2	−67	55
3	300 : 800	>99	101(20)	1.23(3)	26 : 74	28/70/2	−64	54

^aConditions: 6, 10 μmol; [Ph₃C][B(C₆F₅)₄], 10 μmol; toluene, 10 mL; room temperature; IP 12 h; CL 2 h; all entries are done in triplicate.

^bDetermined by ¹H NMR spectroscopy of crude reaction mixtures, comparing monomer peaks to polymer.

^cDetermined by gel permeation chromatography (GPC) in THF using a Wyatt DAWN HELEOS II MALS detector.

^dDetermined by ¹H NMR spectroscopy of the isolated polymer.

^eAverage of the triplicate runs.

^f1,4 and 3,4 selectivity determined by ¹H NMR. Cis-1,4 and trans-1,4 selectivity determined by ¹³C NMR.

^gDetermined by low temperature differential scanning calorimetry (DSC).

^hData for one of the individual runs.