Amino Acids - OCR

Revision notes on amino acids (Chains, Ring and Spec. module) for A2 Chemistry.

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Amino Acids
nitrogen containing compounds
Have distinctive smells ­ smell like rotting fish
Amines can b part of a chain
e.g. CH3NH2­ Aliphatic amines
Amines can be part of a ring
e.g. Aromatic amines
Preparation of Aliphatic Amines
1) Substitution
2) Ethanal + HCN/K+CN­
3) Reduction of a nitrile
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Reduction of NitroCompounds
Chemistry of amines
­NH2 is a base and reacts with an acid (e.g. HCl)
o Acid - Proton (H+) donor
o Base - Proton (H+) acceptor
- A base must have a lone pair of electrons to accept the proton (H+) and form a
dative covalent bond
Relative basicity of Amines
Conversion of Aromatic Amines into Azo-Compounds
Reagents ­ `Nitrous Acid' in excess HCl
`in situ' from
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NaNO2 + HCl HNO2 + NaCl
Sodium Nitrile Nitrous acid
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