Prepare propyne from isopropyl bromide
To prepare propyne from isopropyl bromide, you can follow the following steps:
1. Begin by converting isopropyl bromide to isopropyl alcohol by reacting it with sodium hydroxide (NaOH) in an alcohol-water mixture. The reaction can be represented as follows:
(CH3)2CHBr + NaOH → (CH3)2CHOH + NaBr
2. Next, dehydrate the isopropyl alcohol to form propene. This can be achieved by passing the isopropyl alcohol vapors over a catalyst such as alumina at a high temperature (around 400-500°C). The dehydration reaction can be represented as follows:
(CH3)2CHOH → CH3CH=CH2 + H2O
3. Lastly, convert propene to propyne by treating it with a strong base such as sodium amide (NaNH2). The reaction can be represented as follows:
CH3CH=CH2 + NaNH2 → HC≡CH + NaH + NH3
After completing these steps, you will have successfully prepared propyne from isopropyl bromide.