Table 3. Recyclability of the Superparamagnetic Nanocatalyst 3a in the Addition of Nitromethane to Benzaldehyde.

entry	cycle	yield (%)b	ee (%)c
1	I	77	57
2	II	70	54
3	III	70	50
4	IV	55	25

^aAll experiments were performed under identical conditions: 2-PrOH, 10 mol % of 3a, 10 mol % of Cu(OAc)₂, rt, 72 h.

^bDetermined by NMR analysis.

^cDetermined by chiral HPLC analysis.