Identified transformation products of atenolol are including its mono-, di and tri-hydroxylated derivatives as well as the aliphatic and aromatic ring breakdown products. Transformation of atenolol in the ozonation involved hydroxylation reaction, aromatic ring opening reaction, oxidation and cleavage of 2-hydroxy-3-(isopropylamino)propoxy group of atenolol. In ozonation, aromatic ring of atenolol was transformed through the reaction with both ozone and ?OH whereas the aliphatic chain of atenolol was degraded mainly through the reaction with ?OH. The results also indicated that both ?OH and ozone involved in the aromatic ring opening reaction.
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