Facile montmorillonite K-10-supported synthesis of xanthene derivatives under microwave and thermal conditions

Microwave-assisted and thermal condensations of aromatic and aliphatic aldehydes with -naphthol adsorbed onto montmorillonite K-10 were conducted in a one-pot procedure leading to the formation of a variety of xanthene derivatives. Under microwave irradiation, reactions completed within 4-6min. The procedure is applicable to both aromatic and aliphatic aldehydes, and the catalyst was recycled and reused efficiently in later reactions.