Answered: Identify the pericyclic reaction…

Identify the pericyclic reaction benzocyclobutane E undergoes on heating, give a structure for intermediate H, and provide a mechanism that accounts for its formation.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.43PAE

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Concept explainers

Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.

Question

Identify the pericyclic reaction benzocyclobutane E undergoes on heating, give a
structure for intermediate H, and provide a mechanism that accounts for its
formation.

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Step 1: Electrocyclic reactions and Diels Alder reactions

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Step 2: Identification of H

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Step 3: Formation of G

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Sudlent beaser (ontainiss S 0gf wate has is neecled to convent the l00-0°C.Hol much heeit wat er Stoam2 4H Y42 E 40.7kJ/mol.