3. STEREOKEMIJA - PBF
3. STEREOKEMIJA - PBF
3. STEREOKEMIJA - PBF
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CIS -TRANS – IZOMERIJA - alkeni<br />
Ako se dva istovrsna supstituenta nalaze na istoj strani obzirom na<br />
dvostruku vezu govorimo o cis-izomeru, a ako se nalaze s različite<br />
strane, radi se o trans-izomeru<br />
• pent-2-en<br />
H 3 C<br />
H<br />
C<br />
C<br />
CH 2 CH 3<br />
H 3 C<br />
H H<br />
CH 2 CH 3<br />
C<br />
C<br />
H<br />
H<br />
H<br />
C<br />
C<br />
CH 3<br />
CH 2 CH 3<br />
cis-izomer trans-izomer NIJE ni cis- ni trans-izomer<br />
• 1,2-dikloreten<br />
Cl<br />
Cl<br />
Cl<br />
H<br />
C C<br />
C C<br />
H<br />
cis-izomer<br />
H<br />
H<br />
Cl<br />
trans-izomer<br />
(µ = 2,4 D; t v = 60 °C) (µ = 0 D; t v = 48 °C)<br />
25
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