Table 5 Control experimentsa.

From: Ca(OH)2-Catalyzed Condensation of Aldehydes with Methyl ketones in Dilute Aqueous Ethanol: A Comprehensive Access to α,β-Unsaturated Ketones

Entry

Cat. (mol%)

3a yield/%b

1

NaOH (20)

47

2

NaOH (20) + CaCl2 (10)

78

3

Et3N (20)

35

4

Et3N (20) + CaCl2 (10)

53

5

LiOH (20)

71

  1. a1 mmol 1a, 3 mmol 2a and 1 mL of solvent were employed.
  2. bMolar ration based on 1a in parentheses.
  3. cIsolated yields based on 1a.
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