(a) Pyridoxal catalysis of Eq. 26.53 involves the following transformations. (Running

Chapter 26, Problem 26.18

(choose chapter or problem)

(a) Pyridoxal catalysis of Eq. 26.53 involves the following transformations. (Running these reactions in the reverse direction with a different a-keto acid completes Eq. 26.53.) Using bases (B;) and acids (+BH) as needed, provide curved-arrow mechanisms for these reactions. Your mechanism should show the important intermediates. As part of your mechanism, explain the significance of the pyridinium ion in the catalysis of this reaction sequence.(b) Using bases (B;) and acids (+BH) as needed, provide a curved-arrow mechanism for the conversion of the a-amino acid serine into formaldehyde and glycine (Eq. 26.54, p. 1349).

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