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E, Z isomerism

  1. Dec 2, 2008 #1
    Is this the E or Z isomer of 3-isopropyl-2-heptene?


    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.
  2. jcsd
  3. Dec 2, 2008 #2
    one of the priorities is wrong. take a look at what is bonded DIRECTLY NEXT TO the first carbon
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