. 2017 Jul 5;7:4675. doi: 10.1038/s41598-017-04143-4

Table 2.

Ultrasound-assisted direct cyclization of various hydrazides to 5-substituted-3H-[1, 3, 4]-oxadiazole-2-ones (SOxdOs) using rGOPhSO₃H nano catalyst.

Entry	Hydrazide	5-substituted-1,3,4-oxadiazole-2-ones	Yield (%)^a
15			91
16			88
17			90
18			91
19			98
20			89
21			99
22			96
23			92
24			96
25			99
26			87
27			98
28			94
29			86

^aIsolated product.

Entry	Hydrazide	5-substituted-1,3,4-oxadiazole-2-ones	Yield (%)^a
15			91
16			88
17			90
18			91
19			98
20			89
21			99
22			96
23			92
24			96
25			99
26			87
27			98
28			94
29			86

Entry	Hydrazide	5-substituted-1,3,4-oxadiazole-2-ones	Yield (%)^a
15			91
16			88
17			90
18			91
19			98
20			89
21			99
22			96
23			92
24			96
25			99
26			87
27			98
28			94
29			86

Entry	Hydrazide	5-substituted-1,3,4-oxadiazole-2-ones	Yield (%)^a
15			91
16			88
17			90
18			91
19			98
20			89
21			99
22			96
23			92
24			96
25			99
26			87
27			98
28			94
29			86