Coupling reaction of CO₂ and various epoxides^a.

Entry	Substrate	Residence time (s)	Yieldb (%)	TOFc (h−1)
1	1a	48.8	>99	14 700
2	1b	97.6	>99	7300
3	1c	48.8	>99	14 700
4	1d	97.6	97	7100
5	1e	97.6	96	6860
6	1f	97.6	96	7000
7	1g	97.6	98	7200
8	1h	24.4	>99	29 000
9	1i	97.6	97	7100
10	1j	97.6	91d	6700
11	1k	97.6	92e	6800
12	1l	97.6	87f	6400
13	1m	97.6	81	6000

^aTypical reaction conditions: 150 °C, 2.0 MPa, [Al]/[TBAB]/[PO] = 0.5%/5%/1, [CO₂]/[PO] = 2 : 1. The cyclic carbonate selectivity is >99% based on GC or NMR spectroscopy.

^bYield of cyclic carbonate.

^cTurnover frequency (TOF) = moles of cyclic carbonate per mole of Al-catalyst per hour.

^d Cis/trans = 86 : 14.

^e Cis/trans = 12 : 88.

^f Cis/trans = 38 : 62. The cis/trans ratios were determined by ¹H NMR spectroscopy.