Solvent-Free Henry and Michael Reactions with Nitroalkanes Promoted by Potassium Carbonate as a Versatile Heterogeneous Catalyst

Table 1

Optimization of nitroaldol reaction using K₂CO₃.

Entry	R	R1	R2	Mol (%); catalyst	Temperature (°C)	Time (h)	Yield of 3; (%)
1	Ph	CH3	H	10	25	24	35
2	CH3	CH3	H	30	25	24	54
3	CH3	CH3	H	10	60	4	48
4	CH3CH2CH2	CH3	H	30	25	24	58
5	CH3CH2CH2	CH3	H	10	60	4	68

Yield of pure isolated products.