Which product is obtained in hydroboration oxidation reaction?

Options

A. Propanol
B. Propene
C. Propyne
D. But-1-ene

Answer

To determine the product obtained from the hydroboration-oxidation reaction, we can follow these steps:

### Step 1: Understand Hydroboration
In the hydroboration step, an alkene reacts with diborane (B2H6) or borane (BH3) to form an organoborane intermediate. This step involves the addition of boron (B) and hydrogen (H) across the double bond of the alkene.

**Hint:** Remember that hydroboration is a syn-addition process, meaning that both the boron and hydrogen add to the same side of the double bond.

### Step 2: Identify the Alkene
Let’s consider a simple alkene, such as propene (C3H6). When propene undergoes hydroboration, boron will add to the less substituted carbon (the terminal carbon), and hydrogen will add to the more substituted carbon.

**Hint:** Identify the structure of the alkene you are working with and determine which carbon atoms are involved in the double bond.

### Step 3: Form the Organoborane Intermediate
For propene, the hydroboration will produce an organoborane intermediate, specifically propylborane (C3H7BH2). The structure will have the boron atom attached to the terminal carbon.

**Hint:** Draw the structure of the organoborane to visualize where the boron is attached.

### Step 4: Oxidation Step
In the oxidation step, the organoborane is treated with hydrogen peroxide (H2O2) in the presence of a base (usually NaOH). This converts the boron atom into a hydroxyl group (OH) and replaces it with a hydrogen atom.

**Hint:** Remember that during oxidation, the boron atom is replaced by a hydroxyl group, leading to the formation of an alcohol.

### Step 5: Determine the Final Product
After the oxidation step, the product obtained from propylborane will be propanol (C3H8O). The hydroxyl group will be attached to the terminal carbon, resulting in the formation of 1-propanol.

**Hint:** Ensure you know the difference between primary, secondary, and tertiary alcohols based on the carbon to which the hydroxyl group is attached.

### Final Answer
The product obtained from the hydroboration-oxidation reaction of propene is 1-propanol.