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Topic: How can this molekule be cis?  (Read 1960 times)

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Offline MatthewP27!

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How can this molekule be cis?
« on: December 27, 2016, 04:33:36 PM »
I don´t understand, the substituents to 9th and 10th carbon are not the same so why is it cis? Because of hydrogens from these carbons? I am not sure if they count..
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Offline AWK

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Re: How can this molekule be cis?
« Reply #1 on: December 27, 2016, 05:25:21 PM »
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Offline serendipityfox

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Re: How can this molekule be cis?
« Reply #2 on: December 30, 2016, 12:42:47 AM »
To my understanding - it is the HEAVY branches that count when deciding isomerism... try revising Z/E isomerism it is better system than cis/trans
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Offline discodermolide

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Re: How can this molekule be cis?
« Reply #3 on: December 30, 2016, 07:19:30 AM »
This is a simple case. If the hydrogen atoms are on the same side of the double bond then you have the cis isomer. If they are on the opposite side then you have trans.
In more complex cases, say a tri or tetra substituted double bond then the Cahn-Ingold-Prelog rules apply.
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