7.2 systematische namen

7.2 systematic naming
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7.2 systematic naming

Slide 1 - Diapositive

alkanes
Alkanes are saturated hydrocarbons

Their general formula is CnH2n+2

Slide 2 - Diapositive

alkenes
Alkenes are unsaturated hydrocarbons. 
Their general formula is CnH2n



Slide 3 - Diapositive

Isomers

Isomers are substances with the same molecular formula but a different structural formula.

Slide 4 - Diapositive

Naming
It is best to learn the first six unbranched alkanes by heart.

Branches end with -yl in stead of  -ane.

Slide 5 - Diapositive

stappenplan naamgeving
1 Find the longest unbranched chain of carbonatoms.

2 Find the branches

3 Number the branches by location

Slide 6 - Diapositive

Systematic naming
Step 1: Find thee longest chain of C-atoms.

Slide 7 - Diapositive

Systematic naming
Step 1: Find thee longest chain of C-atoms.

Slide 8 - Diapositive

Systematic naming
Step 1: Find thee longest chain of C-atoms.

Slide 9 - Diapositive

Systematic naming
Step 2: Name the longest chain of C-atoms (main chain).
5 C = pentane 
                                   pent- = stem name
                                     -ane = suffix

Slide 10 - Diapositive

Systematic naming
Step 3: Find the side chains and count their length in C's 


side chains: Alkyl-groups

Slide 11 - Diapositive

Systematic naming
Step 3: Find the side chains and count their length in C's 

Slide 12 - Diapositive

Systematic naming
Step 4: Side chains use the same stem name but another suffix -yl
(methyl) 

side chains are alkyl

methylpentane

Slide 13 - Diapositive

Systematic naming
Step 5: Count the same side chain and add a prefix.
(mono is left out often)


Slide 14 - Diapositive

Systematic naming
Step 5: Count how many of the same side chain.
(mono is left out often)

So we get: dimethyl

For the side chain we put a prefix:
dimethylpentaan 




Slide 15 - Diapositive

Systematic naming
Step 6: number the C atoms in the main chain to give the side chains the lowest possible numbers.

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Slide 18 - Diapositive

Systematic naming
Step 7: put the number before the prefix
- Numbers are separated with a ,
- Numbers and letters are separated
with a -

Dus: 2,3-dimethylpentane
 




Slide 19 - Diapositive

2,3-dimethylpentane
Done

Slide 20 - Diapositive

Name this structural
formula
A
No clue
B
3,3,4-trimethylpentane
C
dimethylhexane
D
2,3,3-trimethylpentane

Slide 21 - Quiz

Which is the right systematic name?
A
4-methylhexane
B
1,3-dimethylpentane
C
3-methylhexane
D
heptane

Slide 22 - Quiz

Get to work on chapter 7.2
Read or do assignments:
CM/EM: 19-21 + 23-24 (p.204-205)
NG/NT: 21-25 (p.204-205)




Slide 23 - Diapositive