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Chapter 16: 16-4P (page 805)

Show the product of the Diels鈥揂lder dimerization of cyclobutadiene.

Short Answer

Expert verified

It is a reaction in which a cyclohexene derivative is formed by the reaction of dienophile (substituted alkene) and a conjugated diene. This involves the shift of four pi electrons of diene and two pi electrons of dienophile.

Step by step solution

01

Diels-Alder reaction

It is a reaction in which a cyclohexene derivative is formed by the reaction of dienophile (substituted alkene) and a conjugated diene. This involves the shift of four pi electrons of diene and two pi electrons of dienophile.

02

Product of dimerization

Two molecules of cyclobutadiene react to form the Diels-Alder product.

Formation of desired product of Diels-Alder reaction

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Most popular questions from this chapter

The proton NMR spectrum of 2-pyridone gives the chemical shifts shown.

(a) Is 2-pyridone aromatic?

(b) Use resonance forms to explain your answer to (a). Also explain why the protons at d 7.31 and d 7.26 are more deshielded than the other two (d 6.15 and d 6.57).

(c) Thymine is one of the heterocyclic bases found in DNA. Do you expect thymine to be aromatic? Explain.

(d) The structure of 5-fluorouracil is shown in the box at the side of the page. Is 5-fluorouracil aromatic? Explain.

Does the MO energy diagram of cyclooctatetraene appear to be a particularly stable or unstable configuration? Explain

Ciprofloxacin is a member of the fluoroquinolone class of antibiotics.

(a) Which of its rings are aromatic?

(b) Which nitrogen atoms are basic?

(c) Which protons would you expect to appear between d 6 and d 8 in the proton NMR spectrum?

One of the following compounds is much more stable than the other two. Classify each as aromatic, antiaromatic, or nonaromatic

(a)Methyl heptalene

(b) Methyl azulene


(c) Methyl pentalene

When 3-chlorocyclopropene is treated with AgBF4, AgCl precipitates. The organic product can be obtained as a crystalline material, soluble in polar solvents such as nitromethane but insoluble in hexane. When the crystalline material is dissolved in nitromethane containing KCl, the original 3-chlorocyclopropene is regenerated. Determine the structure of the crystalline material, and write equations for its formation and its reaction with chloride ion
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