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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

Explain why each compound is aromatic, antiaromatic, or nonaromatic

(a) Isoxazole

(b) 1,3-thiazole

(c) Pyran

(d) Pyrylium ion

(e) 纬 - pyrone

(f) 1,2-Dihydropyridine

(g)Cytosine

(h)

(a) Use the polygon rule to draw an energy diagram for the MOs of a planar cyclooctatetraenyl system.

(b) Fill in the eight pi electrons for cyclooctatetraene. Is this electronic configuration aromatic or antiaromatic? Could the cyclooctatetraene system be aromatic if it gained or lost electrons?

(c) Draw pictorial representations for the three bonding MOs and the two nonbonding MOs of cyclooctatetraene. The antibonding MOs are difficult to draw, except for the all-antibonding MO

(a) Draw the molecular orbitals for the cyclopropenyl case. H H H (Because there are three p orbitals, there must be three MOs: one all-bonding MO and one degenerate pair of MOs.)

(b) Draw an energy diagram for the cyclopropenyl MOs. (The polygon rule is helpful.) Label each MO as bonding, nonbonding, or antibonding, and add the nonbonding line. Notice that it goes through the approximate average of the MOs.

(c) Add electrons to your energy diagram to show the configuration of the cyclopropenyl cation and the cyclopropenyl anion. Which is aromatic and which is antiaromatic?

The following hydrocarbon has an unusually large dipole moment. Explain how a large dipole moment might arise.

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