Naming and Properties of Amines Mini notes on how to name and the properties of amines 0.0 / 5 ? ChemistryAmines and azo dyesA2/A-levelOCR Created by: Rhianne MaslowCreated on: 13-09-13 14:54 Naming Amines - Method 1 Split substance into groups and name each group individually - first part: depends on carbon chain e.g. CH3CH2 would be ethyl - second part: refer to NH2 as amine Examples 1) CH3NH2 = methylamine - first part: CH3 => methyl - second part: NH2 => amine 2) C2H5NH2 => ethylamine - first part: C2H5 => ethyl - second part: NH2 => amine 1 of 4 Naming Amines - Method 2 Count the number of carbons in the longest carbon chain - e.g. 4 carbons = butane See which carbon the NH2 group is attached to => amino Examples 1) CH3CHNH2CH3 = 2 amino propane - first part => CH3-CH-CH3: propane - second part => CH3-CH-NH2: 2 amino 2) CH3CNH2(CH3)CH3 = 2-methyl-2-aminopropane - first part => CH3-C-CH3: propane - second part => CH3-C-NH2: 2 amino - additional part => CH3-C-NH2-(CH3): 2 methyl 2 of 4 Primary, Secondary and Tertiary Amines Primary Amines When the amino group is attached to one alkyl group E.g. CH3-NH2 => methylamine Secondary Amines When the amino group is attached to two alkyl groups E.g. CH3-NH-CH3CH2 => ethylmethylamine Tertiary Amines When the amino group is attached to three alkyl groups E.g. CH3-N-CH3-CH3 => trimethylamine 3 of 4 Properties of Amines Similar to those of ammonia => most properties due to lone pair of electrons on N atom Lone pair responsible for substance being: 1) Very soluble in water => (hydrogen bonding) 2) Base => (accepts protons - due to lone pair) 3) Ligand 4) Nucleophille (donates pair of electrons) Amines with small alkyl groups are soluble but ones with larger groups are less soluble This is because alkyl groups disrupt hydrogen bonding Smaller amines are more soluble as hydrogen bonding is less disrupted 4 of 4
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