N .. CH CH CH CH C H N, N – Diethyl butan- -amine N, N – Diethyl but ane / - -amine Ethyl methyl isopropylamine N .. CH C H CH N – ethyl – N- methyl propan – – amine N – ethyl – N- methyl prop ane / - -amine XII U13-Organic Nitrogen XII U13-Organic Nitrogen - - - - N,N – Dimethyl aniline N (CH ) .. N,N – Dimethylbenzenamine N,N – Dimethyl benzen e / – amine Benzylamine NH ..
Phenyl methanamine Phenyl meth ane / amine N – methyl benzylamine CH NH N – methyl phenyl methanamine N – methyl phenyl meth ane / amine Evaluate yourself Draw the structure of the following compounds i. Neopentylamine ii. Tert – butylamine iii. α - amino propionaldehyde iv.
Tribenzylamine v. N – ethyl – N – methylhexan – - amine ) Give the correct IUPAC names for the following amines i) CH - CH - CH - CH - CH NH ii) CH - CH - CH - CH NH CH iii) NH iv) NH v) XII U13-Organic Nitrogen XII U13-Organic Nitrogen - - - - . . Structure of amines Like, ammonia, nitrogen atom of amines is trivalent and carries a lone pair of electron and sp hybridised, out of the four sp hybridised orbitals of nitrogen, three sp orbitals overlap with orbitals of hydrogen (or) alkyl groups of carbon, the fourth sp orbital contains a lone pair of electron.
Hence, amines posses pyramidal geometry. Due to presence of lone pair of electron C- N- H (or) C- N- C bond angle is less than the normal tetrahedral bond angle . . For example, the C- N- C bond angle of trimethylamine is which is lower than tetrahedral angle and higher than the H- N- H bond angle of ˚ .
This increase is due to the