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Vertiefte Organische Chemie (Lehramt)

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Zusammenfassung/Mitschrift Vertiefte Organische Chemie für Lehramtskandidaten (VOCLA)

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Uploaded on
January 30, 2024
Number of pages
8
Written in
2020/2021
Type
Class notes
Professor(s)
Dr. jan-philip wagner
Contains
All classes

Subjects

Content preview

Stereochemie 1


dreidimensionale Struktur chemischer Verbindungen :
Stereochemie


van't Hoff & Le Bet postulieren 1874 die Tetraedergeometrie

gesättigter c- Atome


Die Drehung um Einfach bindungen führt zu unterschiedlichen ,
drei -




dimensionalen Molekül anordnungen ,
die Konformation genannt
werden
>
Da die Bindungsdrehung beinahe frei ist ,
lassen sich

konformem nicht einzeln isolieren




(
Konstitution Konformation
dreidimensionale ,
Verknüpfung der Atome exakte
• •


,



zweidimensionale Beschrei -



räumliche Struktur

bang ausreichend •
dreidimensionale Beschreibung

+, „
„„„

¥ .

"
*

; „
H -
C -




H von > H C HR3 µ .
/

ATH out
.




( H)
I / I
/
Bindungen '
µ
Ctb H Hsc CH
H -

C -


H '
-


µ }

/ # H H c- c- Bindungsdeckung
H H
G
-
-




anti -



konformer gauche
-



konformer
H Iso -



Butan
M -



Butan

, Ethan


Die günstigste Konformation des Ethan wird erreicht ,
wenn die

H Atome
-



auf Lücke stehen >
gestaffelte Konformation lstaggered )

¥
H, ÄH H
H
H
hinteres C- Atom
( -


c >
.




Yy
Blick
!
H vorderes C- Atom
H H
H



Keilstrichdarstellung Newman -




Projektion




energetisch ungünstig ist , wenn die H Atome
-




zur
Deckung kommen

>
verdeckte Konformation =

elliptisch ledipsed )
H
, rtl "
C- ( HH >
3kcal MOI höher in
HHk unt >

d
H
.




H HH ¥ der Energie ( positiver)
ekliptisch

Torsion Potential
^ elliptische Konformation
t t t
E. f- °




|
°


:
+ Übergangszustand
( instabil )



n




✓ gestaffelte Anordnung
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'
=
Minimum

H C- c- H Diederwinkel
-
(sind jeweils konformer)
$7.88
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