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18 The yields of coumarins obtained in aqueous medium show that the Knoevenagel reaction in water is highly diastereoselective.
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53
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2742586833
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A quantitative conversion of Ig to 4g is obtained only by using two equivalents of lg. By using stoichiometric quantities, a competitive condensation reaction occurs.
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54
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2742576914
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Tetrabuthylammonium bromide is a less effective catalyst than CTABr. The greater catalytic effect of CTABr is ascribable to its greater ability to stabilize the carbon anion.
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