The structure of vitamin A is shown in Problem 4.54. Is the double bond nearest the ring on the carbon chain cis or trans?

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Welcome back. Everyone consider the structure of vitamin K shown below, identify the configuration of the marked double bond as CIS or trans. Let's identify the double bond of interest. And first of all, what we're going to do is add the missing implicit hydrogen atoms. We know that every carbon must have four bonds. And we can only see three bonds for every carbon. Meaning there must be two additional hygen one for each carbon. Let's draw a line passing through the double bond. And let's identify the atoms bonded to each double bonded carbon. For the first carbon, we have hydrogen and carbon. And for the second one, we have hydrogen and carbon, we have to understand that carbon atoms are higher in priority than hydrogens. That's because they have a higher atomic number. So hydrogen relative to carbon would have a lower priority, which is number two. When the highest priority subscriptions are on the opposite sides relative to the double bond, we call such a configuration trans L king. And that would be our final answer. If the two highest priority subscriptions were on the same side of the double bond, that would be CIS but in this case, we can see that the LQ groups are on the opposite sides of the double bond and this gives us strength. Thank you for watching.

The structure of vitamin A is shown in Problem 4.54. Is the double bond nearest the ring on the carbon chain cis or trans?

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Key Concepts

Cis-Trans Isomerism

Structure of Vitamin A

Double Bond Configuration