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Table 2 The yields of pyrazole derivatives 5a,b using Cu(OTf) 2 /Et 3 N catalyst under conventional and ultrasonic irradiations conditions

From: Ultrasonic irradiation assisted efficient regioselective synthesis of CF3-containing pyrazoles catalyzed by Cu(OTf)2/Et3N

Entry Product Ultrasonic irradiation Silent condition
   Time (min.) Yield% Time (h) Yield%
1 5a 45 90 6 80
2 5b 45 88 8 78