The primary amine $ C_4H_ {11}N$ is optically active. Indicate its structural formula and name.
$CH_3CH_2CH(NH_2)CH_3 $ Butan-2-amine
Represent the R enantiomer !
Explain the difference in volatility (boiling point !) of the three compounds indicated:
| $M$ $(\frac{g}{mol})$ | $t^o_{eb}$ $(^oC)$ | |
|---|---|---|
| $N,N$-dimethylethanamine | 73 | 37 |
| Diethylamine | 73 | 56 |
| Butan-1-ol | 74 | 117 |
- The molar masses are comparable. They cannot explain the difference in boiling temperatures. - $N, N$ -dimethylethanamine is a tertiary amine that cannot form hydrogen bonds. It is therefore more volatile than diethylamine forming $H$ bonds. - $H$ bonds of butan-1-ol are stronger than those of diethylamine as $\Delta E_n(O-H)$ $\gt$ $\Delta E_n(N-H)$ Butan-1-ol is therefore more volatile.
