Organic Chemistry

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16. Conjugated Systems

Cumulative Electrocyclic Problems

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Congrats guys, we're almost to the end. But before we finish let's talk cumulatively about thermal and photochemical electrocyclic reactions. 

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Two Steps to Predicting Any Electrocyclic Products

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Step 1:Determine ROTATION (conrotatory vs. disrotatory)

  • a. Obtain HOMO through combination of drawing molecular orbitals + activation type —OR—
  • b. Use Electrocyclic Rotation Summary Chart:
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Step 2:Determine STEREOCHEMISTRY

  • a. Obtain final structure by drawing 3D-representation + ROTATION —OR—
  • b. Use Electrocyclic Stereochemistry Summary Chart
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Problem

Use the summary charts to predict the product of the following reactions. If there is more than one isomer possible, draw them

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Problem

Use the summary charts to predict the product of the following reactions. If there is more than one isomer possible, draw them

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Problem

Predict the product for the following reaction.