Entry Solvent condition t Yielda(%) 1b CH2Cl2 Reflux 6h 39 2b THF Reflux 8h 51 3 Neat 60°C 4h 64 4 Neat 80°C 2h 72 5c Ultrasonication, neat 200W 40min 96 6c,d Ultrasonication, neat 200W 40min 25 aThe yields refer to the isolated pure products. bThe reaction was carried out in 5 mL of solvent. cThe reaction was irradiated by using ultrasonicator laboratory system. dThe reaction was carried out in the absence of KHSO4-SiO2.

Table 4: Conversion of aldoximes into nitriles using KHSO4-SiO2 as a catalyst under different conditions.