Table 1: Reaction time (min) and yield (%) of various purified products (3a–j).

S. no.ChromonesProductsTime (h)Yield (%)
X1X2X3

(1)HHH3a340
(2)HHCH33b3.540
(3)HClH3c3.575
(4)HFH3d3.575
(5)HBrH3e3.580
(6)HHF3f3.580
(7)HHCl3g3.585
(8)HHBr3h3.580
(9)ClHCl3i3.515
(10)ClHH3j3.525