And the goal is to first determine which of the two groups on each carbon has a higher priority. Here is the principle you need to look at each carbon of the double bond separately. It is determined based on the priorities of the groups on the double bond: So, how is the E and Z configuration of a double bond determined? However, there should be a way of distinguishing them since they are not identical.Īnd this is where the E and Z designation is used. We cannot classify these as cis or trans because none of the two groups on the double bond are identical. To illustrate this limitation, let’s consider two isomeric alkenes having four different groups on the double bond: The cis and trans approach works only if two identical groups are connected to the double bond. As a recap, cis and trans stereoisomerism depends on whether two identical alkyl groups on the c=c bond are on the same or opposite sides of that double bond: In the previous post, we talked about the cis and trans designation of alkenes.
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