Why is it necessary to control the pH during the reaction of aldehydes and ketones with ammonia derivatives?

Explanation

To understand why it is necessary to control the pH during the reaction of aldehydes and ketones with ammonia derivatives, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Reaction Context**:
- Aldehydes and ketones can react with ammonia derivatives (such as primary amines) to form imines or enamines. This reaction is crucial in organic synthesis.

2. **Role of pH**:
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