What is the major product of the following reactions?
d.

Guida verificata passo dopo passo

Step 1: Analyze the reactants. The starting material is a pyridone (a six-membered aromatic ring containing nitrogen and a ketone group). The reagent is phosphorus trichloride (PCl₃), which is commonly used for chlorination reactions.

Step 2: Understand the role of PCl₃. Phosphorus trichloride can act as a chlorinating agent, replacing the oxygen atom in the carbonyl group with a chlorine atom. This reaction typically proceeds via the formation of an intermediate where PCl₃ interacts with the carbonyl oxygen.

Step 3: Predict the mechanism. The lone pair on the oxygen of the carbonyl group attacks the phosphorus atom in PCl₃, forming a bond. This leads to the elimination of one chloride ion and the formation of a reactive intermediate.

Step 4: Consider the final product. The intermediate undergoes further reaction, resulting in the replacement of the carbonyl oxygen with a chlorine atom. The major product is likely to be a chlorinated pyridine derivative.

Step 5: Verify aromaticity. After the substitution, the aromaticity of the pyridine ring is preserved, as the reaction does not disrupt the conjugated π-electron system of the ring.

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