Question

how are following compounds obtained from alcohols using pcl3?
a)2-chloropropane
b)2-chloro-2 methylpropane

Answer 1

Hello...

1. 2-Chloropropane

Step 1: Ethanol reacts with PCl3 to give ethyl Chloride.

Step2: Ethyl Chloride reacts with KCN to give Propane nitrile.

Step3: Propane nitrile reacts with NaNO2 in the presence of HCl and LiAl4 to give 1-Chloropropane.

Step4: 1-Propane reacts with Alcoholic KOH gives Propene.

Step5: Propene treated with HCl gives 2-Chloropropane.

2. Synthesis of 2-Chloro 2-methylpropane

When 2-Chloro 2-methyl propanol reacts with HCl, it will Give 2-Chloro 2-methylpropane by replacing OH group with Cl.

Hope it helps you.