vinyl cation for which two Lewis structures may be written. Capture of this cation gives the prod-ucts of 1,2 and 1,4 addition. The 1,2 addition product is more stable because of its conjugated sys-tem. The observations of the experiment tell us that the 1,4 addition product is formed faster,although we could not have predicted that.10.32(a)The two equilibria are:For (E)-1,3-pentadiene:For (Z)-1,3-pentadiene:(b)The s-cis conformation of (Z)-1,3-pentadiene is destabilized by van der Waals strain involv-ing the methyl group.The equilibrium favors the s-trans conformation of (Z)-1,3-pentadiene more than it does that
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