Cis-isomeeril asuvad ühesugused aatomid või aatomirühmad ühel pool kaksiksideme tasapinda, trans-isomeeril paiknevad ühel pool kaksiksideme tasapinda erinevad aatomid või aatomirühmad. Nähtust ennast nimetatakse cis-trans-isomeeriaks ehk geomeetriliseks isomeeriaks. Cis- ja transisomeerid erinevad nii füüsikalistelt kui keemilistelt omadustelt.
This method makes it possible to determine the level of vitamin A (retinol) in feed and premixtures. Vitamin A includes all-trans-retinyl alcohol and its cis-isomers which are determined by this method.
Good to know
in the cis-isomer the atoms are on the same side, in the trans-isomer they are on opposite sides
The two isomers are designated the cis isomer and the trans isomer when the two particular atomic groupings lie respectively on the same or on opposite sides of the reference plane.
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