28. 4 ) When a mixture of Formaldehyde and a non Enolizable aldehyde is treated with a strong base, the later is preferentially reduced to alcohol while formaldehyde is oxidized to formic acid. This variant is known as crossed Cannizzaro reaction . ILLUSTRATIONS
48. Tishchenko reaction A variant of the Cannizzaro reaction, known as the Tischenko reaction is a disproportionate reaction of an Aldehyde lacking a hydrogen atom in the alpha position in the presence of an Alcoxide. Catalyst are aluminium alkoxides or sodium alkoxides . In this reaction the alcohol and acid products combine to form an ester .
56. A convenient disproportionation or reduction of aldehydes is promoted by lithium bromide and triethylamine in a solvent-free environment at room temperature. Recent Literature