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Vertiefte Organische Chemie (Lehramt)

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Zusammenfassung/Vorlesungsmitschrift Vertiefte Organische Chemie für Lehramtskandidaten (VOCLA)

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Eliminierung
ist eine Konkurrenz reaktion zur !
"


Die
Eliminierung nukleophile Substitution


:* :*
"
N NOV + N

Substitution Eliminierung ETOH -
-

Ethanol

90% 10%

Etv N
7- Br ETOH , 55°C
,
HOW
t



20% 80%

# Chemoselektivität :
Reaktion am elektrophile C- Atom vs .
Reaktion am ß
-




H -



Atom .




Ether
+ FBI -


Bro
. -10-1

NUCKOPHIIVS .




Base

Too + Er '
N Alken Eliminierung !
'
H
qq.gg
>
Man spricht von 1,2 -


bzw ß .
-




Eliminierungen ! -




%-)
H X


Mögliche Mechanismen





ÄH rs .




:#it rs.EE#.Em X Abgangsgruppe
" " -

-




TB ps
-


XO _
HBF EWG -
-

Elektronenziehende
"
-
XO
Ew
v

×
Gruppe
B- Base
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v




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H
xo
TB
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ENG
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konjugate

, Die EL Eliminierung
-







bimokklilare Eliminierung
⑤ FO
H '

CI a TCP
µ µ
Ht:
ÄH; " >




4
ö
üä; .


H
¥H
THZO
.




HIP ltoö

ÄÄ
"

at
"

übergangszustand E

> bimdekulare , konzentrierte Reaktion




xinetin.ora.no :
" ""
!!! !:')
Ata -0



anti -




periplanare Anordnung beider Ez :
ttko
>
Faktor
Hund X Stehen auf gegenüberliegenden
Seiten der sich bildenden Hsc
Doppelbindung } '
Br
^




Haftet
alle , auch tertiäre , Substrate gehen Ez Reaktionen ein
aif
• -




HER
mmH.tt/BH
>
keine steirische
Hinderung

Stereochemie




Orbital Überlappung fordert einen anti -




periplanaren Übergangszustand


qq.tn
'
>

Ausbildung der F- Bindung

OCH

Warum nicht syn -




periplanar ? '
X BI ÄX
Newman -




Projektion . .




^




H
BI verdeckt ungünstig
'




,




gestaffelt günstig ,

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Uploaded on
January 30, 2024
Number of pages
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Written in
2020/2021
Type
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Professor(s)
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