Which of the following belongs to benzylic alcohol type?
Which of the following belongs to benzylic alcohol type?
1-Phenyl-2-Propanol
1 - Pheny - 1 - Propanol
4 - Phenyl-but -3 - ene -2 -ol
2-Methyl-but-3-ene-2-ol
Solution
The structure is: \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}(\mathrm{OH})-\mathrm{CH}_2-\mathrm{CH}_3\).
- The \(-O H\) group is attached to the first carbon of the propane chain.
- That same carbon is directly attached to the phenyl (\(C_6 H_5\)) ring.
- Because the \(-O H\) is on the carbon adjacent to the ring, it satisfies the definition of a benzylic alcohol.
- A (1-Phenyl-2-propanol): The \(-O H\) is on the 2 nd carbon, while the ring is on the 1 st carbon. They are not on the same carbon.
- C (4-Phenyl-but-3-ene-2-ol): This is an allylic alcohol because the -OH is adjacent to a double bond.
- D (2-Methyl-but-3-ene-2-ol): This is also an allylic alcohol and contains no benzene ring.