2 duble. leg formeaza 4 steroiz. teoretici, dar practic raman 3 geometrici
cis-cis
trans-trans
cis-trans
1 at C asimetric formeaza cate 2 izomeri din cei 4 teoretici,
(+) cis-cis (-) cis-cis
(+) trans-trans (-) trans-trans
(+) cis-trans = (-) cis-trans = (+) trans-cis = (-) trans-cis
3 + 2 x 2 +1 = 8 => C