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Table 3 Synthesis of pyrazole 11a–l under both ultrasonic irradiation and conventional method

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

Compound no. Product Ultrasonic irradiation Silent condition
   Time (min.) Yield% Time (h) Yield%
11a 45 90 7 80
11b 45 88 7 76
11c 45 90 6 77
11d 45 88 8 75
11e 45 88 10 76
11f 45 85 10 76
11g 60 89 10 76
11h 60 90 10 77
11i 60 85 11 73
11j 60 85 11 77
11k 60 86 9 75
11l 60 90 10 77