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Chapter 27: Q 5. (page 1082)

Question: Use curved arrows and draw the product of each electrocyclic reaction.

Short Answer

Expert verified

Answer

a.

b.

c.

Step by step solution

01

Electrocyclic reactions

The reactions that involve either a ring closure or a ring-opening of a conjugated system are referred to as electrocyclic reactions.

02

Electrocyclic reaction of a

The given reaction involves electrocyclic ring closure.

Electrocyclic reaction of a

03

Electrocyclic reaction of b

The given reaction involves an electrocyclic ring-opening.

Electrocyclic reaction of b

04

Electrocyclic reaction of c

The rotation around the single bond generates a cis-diene.

Electrocyclic reaction of c

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Most popular questions from this chapter

Question:Show that a thermal suprafacial addition is symmetry allowed in a [4 + 2] cycloaddition by using the HOMO of the alkene and the LUMO of the diene.

Question:Draw the product (including stereochemistry) formed from each pair ofreactants in a thermal [4 + 2] cycloaddition reaction.

Question: What cyclic product is formed when each decatetraene undergoes photochemical electrocyclic ring closure?

Question: What product is formed from the Cope or oxy-Cope rearrangement of each starting material?

Question: (a) How many 蟺 molecular orbitals are present in deca-1,3,5,7,9-pentaene (CH2=CH-CH=CH-CH=CH-CH=CH-CH=CH2)? (b) How many are bonding MOs and how many are antibonding MOs ? (c) How many nodes are present in 蠄1*? (d) How many nodes are present in 蠄10*?
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