| |
Experiments for better
teaching
Models
|
P |
| time
requ.: |
10 minutes. |
|
objective: |
Isomerism |
| material: |
- molymod model kit for organic molecules
|
|
procedure 1: |
Build molecular models of
all isomeric butanols and verify that a fourth constitutional isomer
exists (isobutanol). Which properties do you expect? |
|
observation 1: |
1-butanol, 2-butanol, tert.
butanol, isobutanol |
|
interpretation 1: |
In the case of 2-butanol
are mirror-inverted molecular structures (enantiomers) possible. |
|
procedure 2: |
Only tertiary butanol is a
solid at room temperature (m.p.= 25°C). Explain this in terms of sphere
packings |
|
observation 2: |
|
|
interpretation 2: |
|
|
source: |
Barke, H.-D. et al.: One Hundred
Chemistry-Experiments to Avoid Chalk and Talk; University of Muenster,
2004. |
© Walter.Wagner ät uni-bayreuth.de, Stand:
01.06.11
|
