Estimate the stabilization gained as a result of conjugation when 1,4-pentadiene
Chapter 20, Problem 20.2(choose chapter or problem)
Estimate the stabilization gained as a result of conjugation when 1,4-pentadiene isconverted to trans-1,3-pentadiene. Note that the answer is not as simple as com-paring the heats of hydrogenation of 1,4-pentadiene and trans-1,3-pentadiene. Al-though the double bonds are moved from unconjugated to conjugated, the degreeof substitution of one of the double bonds is also changed, in this case, from amonosubstituted double bond to a trans disubstituted double bond. To answer thisquestion, you must separate the effect that is the result of conjugation from thatcaused by a change in the degree of substitution.
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