Novel and Chemoselective Dehydrogenation of 3,4-Dihydropyrimidin-2(1H)-ones with 1,4-Bis(triphenylphosphonium)-2-butene Peroxodisulfate. -The present method tolerates a wide variety of functionalities, including oxidizable groups, cf. (IV). -(GORJIZADEH, M.; Bull. Korean Chem. Soc. 34 (2013) 6, 1751-1754, http://dx.