Abstract
Abstract The catalytic performance of Preyssler, H14[NaP5W30O110]: Wells–Dawson, H6[P2W18O62]; and Keggin, H3[PW12O40] and H4[PMo11VO40], heteropolyacids as pure compounds have been studied in the synthesis of pyrazoles and diazepines in the condensation of hydrazines, hydrazides, and diamines with various 1,3-diketones. In all cases the best yields were obtained using H14[NaP5W30O110].
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