Regeneration of Aldehydes from Oximes, Semicarbazones, Phenylhydrazones and Tosylhydrazones Using Phosphorus Pentoxide in Solvent-Free Condition under Microwave Irradiation.
Highly rapid and efficient synthesis of Bis(indolyl)methanes has been developed by using a mixture of phosphorus pentoxide in methanesulphonic acid (Eaton’s reagent) at ambient temperature under solvent free condition.
Different aromatic aldehydes and cinnamaldehyde undergo cross-aldol condensation with chroman-4-ones and1-thiochroman-4-ones in the presence of amberlyst-15 under microwave irradiation in solvent free condition to afford rapidly the correspondingE-3-arylidene andE-3-cinnamylidene derivatives, respectively, in high yield. This process is simple, efficient and environmentally benign.
A simple and novel microwave irradiation method has been developed for N-acetylation of both aliphatic and aromatic amines with N,N-dimethylacetamide via Nacetyl imidazole by using Imidazole hydrochloride under solvent-free condition. The method proved more eco-friendly and economic.
A new, mild, efficient and environm entally benign method for the cleavage of oximes has been achieved by a simple reaction f oximes with wet alumina supported chromium (VI) oxide under microwave irradiations in solvent-free condition.
Microwave irradiation of ketosemicarbazones on wet silica supported sodium bismuthate under environmentally benign solvent-free condition provides a fast, efficient and simple method for regeneration of ketones in good yields.
Expeditious, Mild and Solvent Free Synthesis of Bis(indolyl)methanes, Using a Mixture of Phosphorus Pentoxide in Methanesulphonic Acid