Journal of Catalysts / 2013 / Article / Tab 3

Research Article

Microwave-Assisted Synthesis of Spirofused Heterocycles Using Decatungstodivanadogermanic Heteropoly Acid as a Novel and Reusable Heterogeneous Catalyst under Solvent-Free Conditions

Table 3

H6GeW10V2O40·22H2O catalyzed reaction of cyclohexanone, aldehyde, and urea.

EntryRProductsaYieldb (%)M.P (°C)

1C6H52a87327–329
24-(NO2)C6H42b79341–343
34-(CH3)C6H42c83348–351
42-(Cl)–C6H42d82321–323

aReaction conditions: cyclohexanone (1.0 mmol), aldehyde (2.0 mmol), urea (3.0 mmol), and decatungstodivanadogermanic acid (3 mmol) irradiated at 80°C under solvent-free condition.