Flashcards in Module 6: Chapter 27 (Amines, Amino Acids and Polymers) Deck (67)
What are amines?
Organic compounds based on ammonia where 1 or more ammonia H-atoms have been replaced by a carbon chain or ring
What are aliphatic amines?
Have straight or branched carbon chains, or non aromatic rings joined to the N-atom e.g. H-(H-)N-CH3
What are aromatic amines?
Have at least one aryl group (aromatic ring) attached to the N-atom, e.g. a benzene ring
What is the ammonia molecule?
- bond angle of 107 degrees (lone pair repels more than the bonded pairs)
What is a primary amine?
An organic compound with an N atom bonded to 1 alkyl or aryl groups
What is a secondary amine?
An organic compound with an N atom bonded to 2 alkyl or aryl groups
What is a tertiary amine?
An organic compound with an N atom bonded to 3 alkyl or aryl groups
How do you name primary amines when the -NH2 is at the END of the chain?
Alkyl group as the prefix and "-amine" as the suffix
What is the systematic name for CH3NH2?
What is the systematic name for CH3CH2CH2NH2?
What is the systematic name for C6H5NH2?
How do you name primary amines when the -NH2 is NOT at the end of the chain?
'placement of NH2 in carbon chain - amino' as the prefix and the name of the longest carbon chain as an alkane as the suffix
What is the systematic name for CH3CH2CH(NH2)CH3?
What is the systematic name for H2NCH2CH2CH2CH2NH2?
What is the systematic name for CH3CH2CH(NH2)CH2NH2?
How do you name secondary amines with one -NH group?
Di-alkyl group as prefix and then 'amine as suffix
How you name tertiary amines with one N?
Tri-alkyl group as a prefix and then 'amine' as a suffix
What is the systematic name for (CH3CH2CH2)2N-H?
What is the systematic name for (C6H5)2N-H?
What is the systematic name for (CH3CH2CH2)3N?
What is the systematic name for (C6H5)3N?
How do you name secondary and tertiary amines with mixed R groups?
- giving the longest carbon chain the suffix of amine (e.g. propylamine)
- giving the shorter chain(s) as N-prefix in alphabetical order (e.g. N-ethyl-N-methyl)
What is the ionic equation of ammonia being added to an acid?
NH3 + H+ -> NH4+
What is the shape of an ammonium ion?
109.5 bond angle
Why are amines useful bases?
The lone pair of electrons on the N atom can be used to accept protons (proton acceptors)
Show the reaction of methylamine and hydrochloric acid?
CH3NH2 + HCl -> CH3NH3+Cl-
methylammonium chloride is made (a salt)
Show the reaction of dimethylamine and sulfuric acid?
2(CH3)2NH2 + H2SO4 -> ((CH3)2NH3+)2SO4^2-
dimethylammonium sulfate is formed (salt)
Show the reaction of 1,2-diaminoethane and nitric acid (in excess)?
NH2CH2CH2NH2 + HNO3 -> NO3^-(+H3NCH2CH2NH3+)NO3^-
How do you make primary amines?
Ammonia can react as a nucleophile to replace the halogen on a haloalkane with the -NH2 group