Anbadons Knoevenagel reaction

The acidity of these products cannot be determined by means of direct pH determination. However, the virtual acidity constant, AT l, is accessible from optical and electrochemical measurements. Comparison of the pX i values of selected Knoevenagel products and the pX values of some typical carboxylic acids in methanol establishes that they exhibit comparable acidity (Scheme 7). Using the o -values, the pX i values of benzylidene derivatives of Meldrum s acid are in good accordance with the Hammett equation. The Lewis acidity of Knoevenagel products is due to the formation of labile pseudobase adducts, the so-called anbadons (10), upon reaction with nucleophiles. Structures of the anbadons have... 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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