How is propanone converted into-

1. Propan-2-ol

2. 2-Methylpropan-2-ol

Propanone, commonly known as acetone, is a versatile organic compound that can be transformed into various alcohols through different chemical reactions. Let's break down how propanone can be converted into both propan-2-ol and 2-methylpropan-2-ol.

Conversion of Propanone to Propan-2-ol

The conversion of propanone to propan-2-ol involves a reduction reaction. In this case, we can use a reducing agent to add hydrogen to the carbonyl group of propanone, effectively converting it into an alcohol.

Reduction Process

• Reagents: Common reducing agents include lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4).
• Reaction Mechanism: The carbonyl carbon in propanone is attacked by the hydride ion (H-) from the reducing agent. This results in the formation of an alkoxide intermediate.
• Protonation: The alkoxide is then protonated by water or an acid, yielding propan-2-ol.

This reaction can be summarized as follows:

Propanone (CH3COCH3) + H2 → Propan-2-ol (CH3CHOHCH3)

Transformation of Propanone to 2-Methylpropan-2-ol

To convert propanone into 2-methylpropan-2-ol, a different approach is required, typically involving a Grignard reaction followed by hydrolysis.

Grignard Reaction Steps

• Formation of Grignard Reagent: First, we need to create a Grignard reagent. This can be done by reacting magnesium metal with an alkyl halide, such as bromobutane (C4H9Br), to form butylmagnesium bromide (C4H9MgBr).
• Nucleophilic Attack: The Grignard reagent acts as a nucleophile and attacks the carbonyl carbon of propanone. This forms a tertiary alcohol intermediate.
• Hydrolysis: Finally, the reaction mixture is treated with water or dilute acid to protonate the alkoxide and yield 2-methylpropan-2-ol.

The overall reaction can be represented as:

Propanone (CH3COCH3) + C4H9MgBr → 2-Methylpropan-2-ol (C5H12O) + MgBr(OH)

Summary of Reactions

In summary, propanone can be converted into:

Propan-2-ol: Through a straightforward reduction using a hydride reducing agent.

2-Methylpropan-2-ol: By employing a Grignard reagent followed by hydrolysis.

Both methods showcase the versatility of propanone in organic synthesis, allowing for the production of different alcohols through distinct chemical pathways.