Barium Dichloride as a Powerful and Inexpensive Catalyst for the Pechmann Condensation without Using Solvent

Table 1

The effect of catalyst amount on the synthesis of 3a at 100°C under solvent-free conditions.

Entry	Catalyst (mol%)	Time (min)	Yield^a (%)
1	—	25	Trace
2	2	25	25
3	5	25	40
4	7	25	75
5	10	25	90
6	20	25	85

^aRefers to isolated yields.