Skip to main content
. 2021 Jul 12;26(14):4219. doi: 10.3390/molecules26144219

Table 4.

Nano ZrO2 catalysed synthysis of 2-aryl benzimidazoles a.

Entry o-PDA
(1)		 Aryl Aldehyde
(2)		 Product
(3)		 Yield
(%) b 		M.P
(°C)
3a graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i002.jpg graphic file with name molecules-26-04219-i003.jpg 93 226–228
(225–226) c
3b graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i004.jpg graphic file with name molecules-26-04219-i005.jpg 95 287–289
(290–292) c
3c graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i006.jpg graphic file with name molecules-26-04219-i007.jpg 91 246–248
3d graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i008.jpg graphic file with name molecules-26-04219-i009.jpg 91 262–264
(268–270) c
3e graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i010.jpg graphic file with name molecules-26-04219-i011.jpg 84 233–234
(234–236) d
3f graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i012.jpg graphic file with name molecules-26-04219-i013.jpg 86 245–246
3g graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i014.jpg graphic file with name molecules-26-04219-i015.jpg 85 252–254
(256–257) d
3h graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i016.jpg graphic file with name molecules-26-04219-i017.jpg 82 201–292
(203–204) e
3i graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i018.jpg graphic file with name molecules-26-04219-i019.jpg 87 254–255
3j graphic file with name molecules-26-04219-i001.jpg graphic file with name molecules-26-04219-i020.jpg graphic file with name molecules-26-04219-i021.jpg 85 278–280

a A solution of o-PDA (1 mol), and aryl benzaldehyde (1.1 mol), in dry. ethanol (20 mL) was heated at 60 °C in nitrogen gas for 3 h in the presence of Nano ZrO2 [2 mol%], b determined by GC, c [12], d [13], e [14]. All the products were showed satisfactory spectroscopic (IR, 1HNMR, & 13CNMR) analyses data.