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Organic Chemistry 1

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Moderate

Thermally Forbidden Reactions

ORGO1-T0CECR

Which of the pericyclic reactions shown are thermally forbidden as sigmatropic shifts? That is, which violate the Woodward-Hoffmann rules for thermal pericyclic reactions?

Select ALL that apply.

A

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B

Image by Daniel J. Berger. Created for Albert.io. Copyright 2016. All rights reserved.

C

Image by Daniel J. Berger. Created for Albert.io. Copyright 2016. All rights reserved.

D

Image by Daniel J. Berger. Created for Albert.io. Copyright 2016. All rights reserved.

E

Image by Daniel J. Berger. Created for Albert.io. Copyright 2016. All rights reserved.