Then on the next page it asks to compare another reaction to this one with anoth
ID: 515050 • Letter: T
Question
Then on the next page it asks to compare another reaction to this one with another set of d and e questions. Reaction 5 is the first picture. Any suggestions? One reaction catalyzed by pu ofamino acids. Complete the structure of the "alpha-carbanion" structure which results from is the d missing pairs or the h" below by showing any lone pas formal charges. op. phosphate N CH, PLP-amino acid imine b. The structure above by delocalization through the PLP to yield what is called the intermediate" shown above. Show "arrow shes" on your ion structure above which ustrate delocalization, and which yield structure of the "quinonoid intermediate". The Chem Wiki website this which we used in class calls PLP an "electron sink" cofactor. What specific feature of PLP allows it to act as an "electron sink ntre the acid, c. The alpha carbon is then reprotonated (by the H-A shown above it. Show "arrow pushes'" for this step on the quinonoid resonance structure which result in onated alpha carbon" structure shown above. This structure will then yield the decarboxylated amino acid when it undergoes a(n) de reaction. d. In the alpha-carbanion resonance structure above the pyridine ring ofthe PLP is stable because it is unstable because it is e. In the quiononoid resonance structure the pyridine ring is stable because but unstable becauseExplanation / Answer
Answer question 1.
(d). In the alpha carbanion resonance structure above the pyridine ring of the PLP is stable because it is aromatic but unstable because positively charged.
(e). In the quinonoid resonance structure the pyridine ring is stable because neutral but unstable because of non aromatic.
Answer question 2:
(d) Both reaction are going through same reaction intermediate i.e., alpha carbanion and quinonoid intermediates.
(e) Diffrent because 1st one is the elimination of carbon dioxide, CO2 (Decarboxylation) while second is elimination of formaldehyde, HCHO.
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