Of the following reactions, how many reaction, are used for the preparation of amines?
`R - overset(overset(O)(||))C- CH_3 + H_3 C - NO_2 overset(NaOH) (to)`

Answer

To determine how many reactions from the given scenario are used for the preparation of amines, we will analyze the reaction step by step.

### Step 1: Identify the Reactants
The reactants in the reaction are:
- A ketone (R - C(=O) - CH₃)
- A nitroalkane (H₃C - NO₂)

### Step 2: Understand the Reaction Conditions
The reaction is carried out in the presence of a base, specifically sodium hydroxide (NaOH). This suggests that the reaction may involve nucleophilic attack and subsequent transformations.

### Step 3: Recognize the Type of Reaction
This reaction is an example of the Henry reaction, which typically involves the reaction of a nitroalkane with a carbonyl compound (like a ketone) in the presence of a base to form a beta-nitro alcohol.

### Step 4: Formation of Beta-Nitro Alcohol
In the presence of NaOH, the nitroalkane reacts with the ketone to form a beta-nitro alcohol. This step does not yield an amine directly, but it is a precursor to further reactions.

### Step 5: Possible Further Reactions
The beta-nitro alcohol can undergo:
- Dehydration to form a nitroalkene
- Reduction to form a beta-amino alcohol

However, the question specifically asks about the formation of amines.

### Step 6: Conclusion on Amines Formation
While the beta-nitro alcohol can be reduced to form a beta-amino alcohol, the question asks if the initial reaction leads to the formation of amines. The reaction does not directly yield an amine; therefore, it cannot be counted as a method for preparing amines.

### Final Answer
Based on the analysis, **0 reactions** from the given scenario are used for the preparation of amines.

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