In continuation of our previous works on the applications of
reusable catalysts inorganic reactions [19–21], here we report the
new efficient and green synthesis of pyranopyrazoles using
Ni0.5Zn0.5Fe2O4@Hap–Cs2CO3 as a basic catalyst (Scheme 1). To
the best of our knowledge, this is the first report on the synthesis,
characterization and catalytic performance of a Ni0.5Zn0.5Fe2O4@
Hap–Cs2CO3 catalyst