Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Oxidation of secondary amines catalyzed by methyltrioxorhenium (MTO) with H 2 O 2 or urea-hydrogen peroxide complex (UHP) at room temperature gives the corresponding nitrones in good yields. ... Oxidation of secondary amines catalyzed by methyltrioxorhenium ...