Screening of the synthesis of cyclic carbonate from CO₂ and epichlorohydrin using Bi₃₈O_44/45@Ti_xL-oxo core–shell clusters as catalysts^a.

Entry	Catalyst	Yieldb (%)
1	PTC-285	86
2	PTC-282	84
3	PTC-281	76
4	PTC-284	75
5	PTC-283	70
6	PTC-286	63
7	Blank	44

^aReaction conditions: epichlorohydrin (10 mmol), catalysts (0.005 mmol), nBu₄NBr (1 mmol), room temperature, 24 h, CO₂ (1 atm gauge pressure).

^bTotal yield was determined by ¹H NMR spectroscopy using dibromomethane as an internal standard (Fig. S31 to S36).