Understanding E and Z Isomerism in 3-Isopropyl-2-Heptene

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SUMMARY

The discussion centers on the isomerism of 3-isopropyl-2-heptene, specifically determining whether it is the E or Z isomer. Participants debate the priority of substituents based on the Cahn-Ingold-Prelog priority rules. One contributor asserts that the isomer is Z based on their interpretation of the priority of groups attached to the double bond, while another argues for the E configuration due to the longer carbon chain on one side. The conclusion emphasizes the importance of correctly applying the priority rules to ascertain the correct isomer.

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  • Cahn-Ingold-Prelog priority rules
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Is this the E or Z isomer of 3-isopropyl-2-heptene?

1538enn.jpg


My book says Z, but I would think it's E. On the left, there is no doubt which group has higher priority. I would believe that on the right side, the lower group has the higher priority because there is a longer chain of C-atoms.
 
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one of the priorities is wrong. take a look at what is bonded DIRECTLY NEXT TO the first carbon
 

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