Amines, Amino Acids And Polymers Flashcards

1
Q

What are amines

A

Organic compounds derived from ammonia NH3, one of more H atoms have been replaced by a carbon chain or ring

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2
Q

Simplest aliphatic amine

A

Methylamine CH3NH2

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3
Q

Simplest aromatic amine

A

Phenylamine C6H5NH2

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4
Q

Primary secondary and tertiary aliphatic amines

A

See card 1

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5
Q

Naturally occurring amines

A

Serotonin; neurotransmitter responsible for muscle contraction and depression
Pseudoephedrine; ingredient in decongestion medications

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6
Q

How to name primary amines

A

Primary amine with -NH2 at end of chain: add -amine to name of alkyl chain
Primary amine with -NH2 on any other carbon: prefix amino and number to indicate position of this group
See card 2

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7
Q

How to name secondary or tertiary amines containing same alkyl group

A

Prefixes di- or tri- used to indicate no. of alkyl groups attached to N
E. G (CH3)2NH is dimethylamine
See card 2

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8
Q

How to name amine with two or more different groups attached to N atom

A

Compound named N-substituted derivative of larger group

See card 2

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9
Q

WHat happens when amine accepts a proton

A

Dative covalent bond is formed between the lone pair of electrons on N atom and the proton
See card 3

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10
Q

Salt formation of amines

A

Amines are bases and neutralise acids to make salts

See card 4

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11
Q

Formation of primary amines

A

Ammonia has lone pair of e on N atom which allows ammonia to act as nucleophile in substitution reaction with haloalkane
Product of reaction: ammonium salt
Aqueous alkali added to generate amine from salt
See card 5

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12
Q

Formation of secondary and tertiary amines

A

See card 6

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13
Q

Why can u not make pure primary amine

A

Product still contains lone pair of e on N atom that can further react with a haloalkane to form a secondary amine

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14
Q

Prep of aromatic amines

A

Phenylamine C6H5NH2 made by reduction of nitrobenzene C6H5NO2
See card 7

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15
Q

General formula of alpha amino acid

A

RCH(NH2)COOH

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16
Q

Less common amino acids

A

Amine group connected to B carbon atom (3rd C atom) and Y carbon atom (4th C atom)

17
Q

Why do amino acids have similar reactions to both carboxylic acids and amines

A

Have both an acidic COOH and basic NH2 functional group

18
Q

Reaction of amine group of amino acid

A

Amine group is basic and reacts with acids to make salts

See card 8

19
Q

Reactions of carboxylic acid group in amino acids

A

Carboxylic acid can react with alkalis to form salts and with alcohols to form esters
See card 9

20
Q

Esterification with alcohols

A

Amino acids easily esterified by heating with excess alcohol in presence of conc H2SO4
Acidic conditions protonate basic amine group of Ester
See card 10

21
Q

Amide groups are common in nature e.g.

A

In proteins amine and carboxylic acid groups of amino acids are bonded together to form amide groups

22
Q

Primary secondary and tertiary amides

A

See card 11

23
Q

Optical isomerism is a type of

A

Stereoisomer

24
Q

Optical isomerism is found in molecules which…..

A

Contain a chiral centre
In organic chem this is a carbon atom that is attached to 4 different atoms or groups of atoms
Choral Carbon atoms exist widely in naturally occurring organic molecules

25
Presence of chiral carbon atom leads to
Existence of 2 non superimposable mirror image structures. These 2 molecules known as optical isomers or enantiomers
26
Example of chirality
See card 12
27
Is chirality only reserved for C atoms?
No, term applies to any centre that holds attachments that can be arranged as 2 non superimposable mirror image forms
28
How to identify chiral centres in molecules
See card 13
29
2 important condensation polymers
Polyesters and polyamides | Carb acids and their derivatives are common starting materials for their prep
30
Two ways to make polyesters
Monomers are joined together by Ester linkages in long chain to form polymer Made by 1. One monomer containing both carb acid and alcohol group 2. Two monomers one containing 2 carb acid groups and other containing 2 alcohol groups
31
Polyesters made from one monomer contains 2 different functional groups
See card 14 | Both PGA and PLA (polylactic acid) are biodegradable polymers
32
Polyester made from 2 monomers each containing two functional groups
See card 15
33
Polyamides
Condensation polymers formed when monomers joined by amide linkages in long chain Made two ways: 1. One monomer containing both carb acid (or acyl chloride) and an amine group 2. 2 monomers one containing 2 carb acids (or acyl chlorides) and other containing 2 amine groups
34
Polyamide made from one monomer with two functional groups
Form polypeptides or proteins | See card 16
35
Polyamide made from two monomers each with two functional groups
See card 17
36
Acid and base hydrolysis or polyesters
See card 18
37
Hydrolysing polyamides
See card 19