With the use of sodium hypochlorite associated with the ultrasonic irradiation, it is possible to carry out the chlorination of several aromatic rings. Thus, this work aims to present results obtained in exploratory tests with different conditions and using various substrates against the chlorination of aromatic rings under the ultrasonic irradiation with the use of sodium hypochlorite (a cheaper reagent, less toxic and that causes low impact to the environment). In addition, heterogeneous recoverable catalysts that also present low toxicity was used and thus Green Chemistry concept was applied. In this study, a sreening was performed using the DMA reagent as standard reagent to choose the best reaction conditions and two different condition presented excellent results: one of them having niobium oxide (Nb2O5) and solvent monoethylene glycol (MEG) and another condition also used Nb2O5 and methanol as solvent. This methodology was applied in the chlorination of different aromatic compounds, to which some compounds had good conversions (greater than 50% conversion) to excellent (greater than 85% conversion) and other compounds did not react at very low reaction times (5-10 minutes). Compared to the literature, higher selectivity conditions, higher conversions were achieved in much lower times using cheaper and less toxic reagents, the structures of the compounds obtained were confirmed by Gas Chromatography coupled to Mass Spectrometry (GC / MS).