Amines and Amides Flashcards
How is nitrous acid prepared in situ? What forms as it decomposes?
Mixing sodium nitrite and HCl. Water, NO and NO2.
At what temperature do alkyldiazonium ions decompose at? What is formed?
5oC and above. Nitrogen gas, alcohol and alkene.
Why are benzenediazonium ions strong electrophiles?
Due to the positive charge on the -N2+ group.
What type of amine is produced with excess ammonia?
primary.
When amines react with complex ions what do they do at first?
remove protons from water.
When a diazonium ion reacts with phenylamine, what are the conditions?
dissolve phenylamine in acid.
why are the diazonium salts of arylamines more stable than those of alkyl?
because the electrons of the N triple bond interact with the DELOCALISED electrons in the benzene ring.
why are azo dyes coloured?
the extended delocalised system across the molecule through the azo group absorbs light in the blue region of spectrum.
although they are fairly strong, why can’t alkylamines be described as strong? What alkali are they stronger than?
they are not fully ionised (like NaOH) but they do readily accept protons. They are stronger than ammonia.
in what case is the prefix ‘amino’ used?
when there are two or more functional groups.
