Table 2.

Preparation of 1,8-dioxodecahydroacridine derivatives using NiO@Bentonite nanocomposite as catalyst.

Entrya	R (aldehyde)	Product	Time (min)	Yield (%)b	$m.p.{(}^{\circ }\mathrm{C})$
					Found	Reported [ref.]
1	3-NO2C6H4-	4a	3	97	193–196	194–19654
2	3-OCH3-4OHC6H3	4b	2	94	221–225	224–22655
3	4-ClC6H4-	4c	5	92	148–149	148–15154
4	4-OHC6H4-	4d	3	95	282–284	284–28640
5	4-OCH3C6H4-	4e	3	98	217–218	219–22154
6	5-Br-2-OHC6H3-	4f	10	98	247–251	248–25050
7	2-OH-1-naphthaldehyde	4g	12	99	288–290	New
8	2-NO2C6H4-	4h	4	97	188–190	187–18942
9	4-N(CH3)2C6H4-	4i	2	99	168–170	166–16842
10	2-OH-3-OCH3C6H3-	4j	2	94	228–229	227–23054
11	4-BrC6H4-	4k	6	98	> 300	> 30040
12	3-OHC6H4-	4l	4	94	231–233	230–23242
13	2-ClC6H4-	4m	4	92	248–250	249–25256
14	3,4,5-(OCH3)3C6H2-	4n	2	95	222–224	New

^aReaction conditions: 3-nitrobenzaldehyde (4 mmol), aniline (4 mmol), dimedone (8 mmol) and NiO@Bentonite catalyst (0.121 g, 20% wt.) under different conditions.

^bIsolated yields after purification.