An Efficient Synthesis of Bis-indolylindane-1,3-diones, Indan-1,3-diones, and Indene-1,3(2H)-denies Using [Hbim]BF₄ Ionic Medium

Table 3

Preparation of 7 in ionic liquid [Hbim]BF₄.

Entry	R^5	Product	Time (min)	Yield (%)^a	Melting point (°C)
1	H	7a	15	95	New
2	m-CH3	7b	5	97	New
3	m-Cl	7c	10	93	New

aYield refers to pure products after crystallization.