Microwave-Assisted Synthesis of Tetrahydrocarbazole Linked 1,2-Diazoles in Aqueous-Brønsted Acid Catalytic System

Table 3

Optimization of reaction conditions.

Entry	Conventional heating			Microwave irradiation
	Catalyst (mol%)	Time (hr)	Yield (%)	Catalyst ratio	Time (min)	Yield (%)
(1)	10	5	48	2 : 1	15	32
(2)	20	2.5	75	1 : 1	4	88
(3)	30	4	43	1 : 1.5	6	46
(4)	40	3.5	30	1 : 2	12	38

Sodium methoxide; acetic-acid-water.