A Clean, Simple, and Efficient Synthesis of 2-Substituted Aryl (Indolyl) Kojic Acid Derivatives by Kaolin/Ag Nanocomposite as a Reusable Catalyst: A Green Protocol

Table 4

Effect of the solvent on the synthesis of 4a by Kaolin/Ag nanocomposite catalyst.

Entry	Solvent	Yield^a (%)
1	EtOH	60
2	THF	20
3	H2O	45
4	n-Hexane	10
5	Toluene	50
6	Solvent-freeb	98

a60 min at reflux temperature in 10 mL solvent.
b60 min at 90°C.