AminesAng Flashcards
What are the reason for higher boiling points for primary amines?
cos they can form hydrogen bonds with each other as well as van der Waals dispersion forces and dipole-diploe interactions
Give an example of isomers of amines?
ethylamine and dimethylamine
How is the boling point of primary amines compared to secondary amines?
the boiling point of secondary amines is a little lower than corresponding primary amine with the same number of carbon atoms. this is because of the lower diploe-diploe attractions in the dimethylamine compared with ethylamine
How is the boling point of tertiary amines compared to secondary amines?
because there aren´t any hydrogen bonding between tertiary amines their boiling point is much lower than secondary.
solubility of amines
- the small amines of all types are very soluble in water.
- solubility falls of as the hydrocarbon chains get longer. noticeably after about 6 carbons
hydrogen bonding with water
all of the amines form hydrogen bonds with water - even the tertiary ones. The tertiary ones uses the lone pair of nitrogen to form hydrogen bonds with water.
The small amines (like methylamine and ethylamine) smell similar to
ammonia, but more complex
What smell does the bigger amines have
- fishy
- decay
What does trimethylamine smell like
- decaying fish
- hawthorn blossom
- cotoneaster blossom.
Are ammonia electrophiles or nucleophiles?
nucleophile
Why does ammonia act like nucleophiles?
Ammonia can act as a nucleophile, with the lone pair of electrons on the N atom attacking electrophiles such as halogenoalkanes
Are halogenoalkanes electrophiles or nucleophiles?
electrophiles
Are amines electrophiles or nucleophiles?
nucleophile
Why does amines act like nucleophiles?
Amines can act as a nucleophile, with the lone pair of electrons on the N atom attacking electrophiles such as halogenoalkanes
