Catalytic evaluation of Co1–Co5 using MAO as co-catalyst^a.

Entry	Precat.	Al : Co	T (°C)	t (min)	Activityb	M w c	M w/Mnc	T m d (°C)
1	Co4	2000	30	30	2.20	5.69	2.27	126.6
2	Co4	2000	40	30	3.25	4.39	2.28	125.9
3	Co4	2000	50	30	5.80	3.64	2.93	125.0
4	Co4	2000	60	30	4.97	3.06	2.03	124.5
5	Co4	2000	70	30	4.23	2.93	2.34	124.1
6	Co4	1750	50	30	3.84	3.77	2.05	125.1
7	Co4	2250	50	30	8.65	3.17	2.05	124.2
8	Co4	2500	50	30	6.79	2.92	1.66	125.0
9	Co4	2750	50	30	5.16	2.77	1.95	123.3
10	Co4	2250	50	5	28.2	3.47	2.00	124.8
11	Co4	2250	50	15	10.4	3.48	2.19	124.9
12	Co4	2250	50	45	4.71	3.30	1.95	124.7
13	Co4	2250	50	60	3.78	3.20	1.95	124.7
14e	Co4	2250	50	30	4.52	3.68	3.28	125.0
15	Co1	2250	50	30	16.18	2.67	2.43	123.3
16	Co2	2250	50	30	2.42	9.91	2.30	129.6
17	Co3	2250	50	30	0.16	146.43	1.67	131.2
18	Co5	2250	50	30	1.48	11.38	2.08	129.3

^aConditions: 2.0 μmol of cobalt precatalyst, 10 atm of ethylene, 100 mL of toluene.

^bActivity: 10⁶ g PE per mol (Co) per h.

^c M _w in kg per mol. M_w and M_w/M_n measured by GPC.

^dMeasured by DSC.

^e5 atm.