Synthesis of cyclic carbonates from epoxides and carbon dioxide catalyzed by talc and other phyllosilicates

BMC Chemistry

Table 4 Conversion and selectivity in the coupling of CO₂ and PO to produce PC catalysed by phyllosilicates calcined at different temperatures

Entry	Catalyst	Calcination Temperature	PO Conversion [%]	PC Selectivity [%]
1	Talc	100	98.9	93.7
2	Talc	300	96.7	94.5
3	Talc	500	95.3	94.2
4	Vermiculite	100	90.1	95.3
5	Vermiculite	300	89.4	96.1
6	Vermiculite	500	87.6	96.4
7^[a]	Talc	100	97.5	92.5
8^[a]	Vermiculite	100	88.2	95.6
10^[b]	Talc	100	96.5	92.8

Reaction conditions: propylene oxide (10 mmol), catalyst (100 mg), TBAB (2.5 mol % of epoxide), CO₂ (30 bars), MeCN (5 ml), Temperature (140 °C), Time (20 h)
PO propylene oxide, PC propylene carbonate
^aco-catalyst TBAI
^bTalc catalyst dried at 100 °C and stored in a vial for 3 months

ISSN: 2661-801X