Keggin type phosphotungstic acid encapsulated chromium (III) terephthalate metal organic framework as active catalyst for Biginelli condensation

Dodecatungstocobaltate heteropolyanion encapsulation into MIL‐101(Cr) metal–organic framework scaffold provides a highly efficient heterogeneous catalyst for methanolysis of epoxides

“…TEM and SEM images of the Co‐POM@MIL‐101 hybrid material are shown in Figure . These images reveal micrometre‐sized crystallites with sizes and shapes similar to those previously reported . Spherical interior particles illustrate incorporation of Co‐POM into the MOF pores.…”

Au Nanorod: An Efficient Catalyst for One‐Pot Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones via the Multicomponent Biginelli Reaction.

“…As previously reported, a slightly lower yield was obtained in the presence of Bi 2 Mn 2 O 7 nano–powders . p– Nitrobenzaldehyde with strong withdrawing electron substituent was condensed in 89 % isolated yield for 4 h. In the previous report, the Biginelli reaction of p– nitrobenzaldehyde catalyzed by PTA@MIL‐101 afforded the corresponding product in a lower yield . On a 10 mmol scale, the yields are almost the same as with the optimized condition in the present method (Table , entries 1 and 6).…”

12‐Tungstosilicic Acid H4[W12SiO40] Over Natural Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2(1H)‐Ones

“…This shows that this procedure is environmentally benign. In comparision for model reaction (benzaldehyde, ethylacetoacetate and urea), this catalyst did not exhibit at par catalytic activity as compared to Fe 3 O 4 @SiO 2 ‐imid‐PMA n (93 %), AT‐Mont (98 %), MCM‐41‐R‐SO 3 H (92 %), PAFMS‐1 (92 %), ZrO2@SO 3 H (92 %), PTA@MIL‐101 (90 %) and TPA & TSA over MCM‐41(94 % and 92 %) and Hβ(98 % and 95 %) …”