Table 1.

Self-condensation of ketones in the presence of solid acid/base catalysts

Ketone (1, 2 mmol), catalyst (200 mg) and toluene (3 mL) was heated in a sealed Q-tube reactor. Conv.1, conversion of compound 1.

^*Mixture of positional and stereoisomers.

^†Catalyst MgAlO represents calcined Mg/Al-hydrotalcite (Mg/Al = 3:1) and Nb₂O₅ represents calcined niobic acid.

^‡Cyclohexane (3 mL) was used as solvent.