An Efficient Protocol for the Green and Solvent-Free Synthesis of Azine Derivatives at Room Temperature Using BiCl₃-Loaded Montmorillonite K10 as a New Recyclable Heterogeneous Catalyst

Table 3

Reusability of Bi-K10 on condensation of benzophenone hydrazone (1 mmol) and acetophenone (1 mmol) under grinding at room temperature.

Entry	1	2	3	4	5
Yield^a	98.0	96.0	95.0	94.0	94.0

^aYields with respect to benzophenone hydrazone.