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Phosphorus, Sulfur, and Silicon and the Related Elements, Volume 179, Issue 11 November 2004 , pages 2169 - 2175
TETRABUTYLAMMONIUM HYDROGEN SULFATE: AN EFFICIENT CATALYST FOR THE SYNTHESIS OF 3,4-DIHYDROPYRIMIDIN-2(1H)-ONES UNDER SOLVENT-FREE CONDITIONS
Ahmad Shaabani; Ayoob Bazgir; Sakineh Arab-Ameri
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dx.doi.org/10.1080/10426500490474815огромное спасибо