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Vertiefte Organische Chemie (Lehramt)

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Zusammenfassung/Mitschrift Vertiefte Organische Chemie für Lehramtskandidaten (VOCLA)

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  • January 30, 2024
  • 7
  • 2020/2021
  • Class notes
  • Dr. jan-philip wagner
  • All classes
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Elektrophile aromatische Substitution

1,39 Ä
<
> -
. .
I . .

( Doppelbindung :
1,34 Ä
Einfach bindung :
1,54 Ä )
Benzol aromatisches
Sextett

- O -


Gerüst mit cydischdelokalisiertem F- System Benzol
.
ist eine besonders stabilisierte


aromatische Verbindung .




Hückel -




Regel :




Eine Verbindung ist dann aromatisch , wenn sie



cyclplanar
ische





vollständig konjugiert Isp oder sp Hybridisierung) ist
?
&

-
-




4Mt 2 IT E vorliegen

-




>
keine Mesomerie
-

Systeme mit 4h IFE sind dagegen anti aromatisch III.
'


Et )


"" " ""

iio:
"




Cydopentadienyl -




Tropyliumkation
anion

Aromaten reagieren so , dass ihre aromatische Stabilisierung am Ende der Reaktion

wiederhergestellt und erhalten bleibt >
Substitution

MO Betrachtung -
Frost MUSUIIM Diagramm
• -
-
-




^ ^




)
E
Benzol :
„ E Cycloblttadilh :




t.IT
Ä
Et ¥3 anbindend
* # i nicht
.it?aYenaettE:-+#I
O O i .
-




:
"
bindend tt
ttr
SÄHEN
r

, Reaktivität

¥
Br
Allem + Br -


Br .
II gutes Nlkkophil
Br
,

Aromaten + Br -

Br II >
keine Reaktion H schlechtes Nuckophil

>

Aktivierung durch einen

Katalysator ( Lewis-Säure)

Br
Brüter .




40°C


in situ ö ⑦ d-
:


-0

EBB
+ Bk >
Br -

Br -




EBß I # kein Br
" " "
)



EI + Br -




Er EBB -




*.
EEIEI . .
¥
'




O -




Komplex
Wheland -


Intermediat


1- BF -

Ht
# Verlust der =
Aromatizität v v



"


EI! Substitution
Addition


Zweitsubstitution :
elektronen reiche Aromaten
E- schiebender
Methoxygruppe :




CH Substitut HM )
g- }
" " "
. .
: . . .




ÖANSOI
µ Potenz )
reaktiver als Benzol !
810 Größenordnungen >
nur ortho +
para Position reaktiv






¥!
0
"
In Brz , HOAC 25°C
kein meta
,
.
+ .




meint:^*, 96%
Produkt !

4%

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