“…Recently, gem-dihydroperoxides have been synthesized and have been used for oxidation reactions Bunge, Hamann, McCalmont, & Liebscher, 2009;Das, Krishnaiah, Veeranjaneyulu, & Ravikanth, 2007;Das, Veeranjaneyulu, Krishnaiah, & Balasubramanyam, 2008;Ghorai & Dussault, 2008;Li, Hao, Zhang, & Wu, 2009;Žmitek, Zupan, Stavber, & Iskra, 2006;Žmitek, Zupan, Stavber, & Iskra, 2007). We have synthesized trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxalane (Scheme 1) and used it as a powerful oxidant in some organic reactions (Azarifar & Khosravi, 2010a;Azarifar & Khosravi, 2010b;Azarifar, Khosravi, & Soleimanei, 2009;Azarifar, Najminejad, & Khosravi, 2013;Khosravi, 2014;Khosravi, 2015;Khosravi & Kazemi, 2012;Khosravi, Mobinikhaledi, Kazemi, Azarifar, & Rahmani, 2014;Khosravi, Pirbodaghi, Kazemi, & Asghari, 2015). So, in continuation of our interest in the application of DHPDMDOs, we used DHPDMDOs for in situ generation of Br + from NH 4 Br for catalysis of oxidative aromatization of 1,4-dihydropyridines to corresponding pyridines under mild conditions and short reaction times (Scheme 2).…”