Find out number of reactions which involve electron deficient
nitrogen during reaction mechanism.
`H_(3) C - overset(overset(O)(||))C - Ph overset(Ph CO_(3) H) (to)`

Answer

To solve the question regarding the number of reactions that involve electron-deficient nitrogen during the reaction mechanism of the given compound, we can follow these steps:

### Step 1: Identify the Reaction Type
The reaction described involves a ketone reacting with a peroxy acid (or peroxide) in the presence of a solvent (CH2Cl2). This is indicative of a Baeyer-Villiger oxidation.

**Hint:** Look for the type of reaction and the reagents involved to understand the mechanism.

### Step 2: Analyze the Reactants
The reactants include a ketone and a peroxy acid. The ketone has a carbonyl group (C=O), and the peroxy acid has an -OOH group. In this reaction, the carbonyl carbon of the ketone is electrophilic, while the peroxy acid acts as an oxidizing agent.

**Hint:** Identify the functional groups in the reactants and their roles in the reaction.

### Step 3: Determine the Role of Nitrogen
In the Baeyer-Villiger oxidation, the reaction mechanism does not involve any nitrogen species. The ketone is converted into an ester without the participation of nitrogen. Therefore, there is no electron-deficient nitrogen involved in this reaction.

**Hint:** Check if nitrogen is present in the reactants or products and consider its role in the reaction mechanism.

### Step 4: Conclude the Number of Reactions Involving Nitrogen
Since the reaction does not involve any nitrogen, the number of reactions that involve electron-deficient nitrogen in this specific mechanism is zero.

**Hint:** Summarize your findings to arrive at the final answer.

### Final Answer
The number of reactions which involve electron-deficient nitrogen during the reaction mechanism is **0**.