Curcumin has been widely known as a multifunctional natural product which has many biological activities. However, the biggest limitation for the large scale application of curcumin is its poor bioavailability. This research presented a cheap, mild and efficient solvent-free synthesis of monocarbonyl analogs of curcumin via Aldol condensation using activated chicken eggshells (ACE). Dibenzalpropanone as a product of Aldol condensation was prepared by mixing benzaldehyde and acetone using a simple glass tube in the presence of ACE under ultrasound irradiation (78 % yield), while dibenzalcyclohexanone was produced from the reaction of benzaldehyde with cyclohenxanone (81 %). The products have been characterized by FTIR, UV-Vis spectrophotometer and GC-MS instruments. The FTIR spectra show a significant absorption of carbonyl group that attached to the double bond in α,β-position at 1630-1660 cm-1. The molecular cation of m/z of 234 and 274 is in agreement with the products structures.