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. 2021 Oct 29;9:765108. doi: 10.3389/fchem.2021.765108

TABLE 2.

Yield (%) of styrene carbonate obtained with Salophen-tBu-Cr@{NH2}-SBA-15

Entry Co-cat (lewis acid) cat. (Lewis base) T (°C) 3 h 7 h 23 h
1 Salophen-tBu-Cr@SBA Bu4NBr 80 58 77 100
2 Salophen-tBu-Cr@SBA Bu4NBr 60 10 32 79
3 Salophen-tBu-Cr@SBA Bu4NBr 50 5 13 47
4 a Salophen-tBu-Cr@SBA Bu4NBr 80 n.d. 78 n.d.

Conditions: Styrene oxide (5.6 mmol), Bu4NBr (0.1 mmol), supported Salophen-tBu-M (0.05 mmol) in 13 ml of benzonitrile under 11 bars of CO2 (initial pressure).

a

Reaction conducted in acetonitrile. n.d. = this reaction was not carried out under these specific conditions.