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Table 2 The synthesis of acylal from benzaldehyde and acetic anhydride in the presence of recycled NaHSO 4 -SiO 2

From: NaHSO4-SiO2 as an efficient and chemoselective catalyst, for the synthesis of acylal from aldehydes under, solvent-free conditions

Entry Cycle Time(min) Yield(%)a
1 1st use 15 94
2 2nd use 20 89
3 3rd use 30 77
  1. aIsolated yield.