Synthesis of Tetra-(n-butylpyridinium) octamolybdate catalyst

Combine 10 g of anhydrous sodium molybdate, 5.2 mL of 37% hydrochloric acid and 15 mL of water. Combine 4.5 g of benzyltriethylammonium chloride with 25 mL of water in another beaker, heat to 70°C and combine both solutions slowly with stirring. Stir for another 30 minutes, filter and wash with water.

8 Na2MoO4 + 12 HCl + C10H16ClN = [BnEt3N]4Mo8O26 + 16 NaCl + 6 H2O

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