Model Michael addition in homogeneous environment catalyzed with Id^a.

Entry	Solvent	Reaction time [h]	Conversionb (isol. yieldc) [%]	eed [%]	syn : antib
1	Hexane	72	61 (32)	95	94 : 6
2	Toluene	48	Quant. (92)	89	91 : 9
3	DCM	72	77 (52)	80	90 : 10
4	MeOH	72	0	—	—

^aReaction conditions: nitrostyrene 0.25 mmol, cyclohexanone 250 μl, Id 0.025 mmol, acetic acid 0.035 mmol, solvent 1 ml, t = 25 °C.

^bDetermined by ¹H NMR.

^cPurified by column chromatography (hexane : ethyl acetate = 5 : 1).

^dDetermined by chiral HPLC (column YMC Amylose C, mobile phase heptane : IPA = 9 : 1, flow rate 0.7 ml min⁻¹).