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Biosynthesis of Endiandric Acid B

Exercise: Interactive 3D Molecular Animation of the Endiandric Acid B Biosynthesis

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Fig.1

The interactive 3D molecular model depicts the position in the biosynthesis of endiandric acid B just before the second electrocyclic ring closure.

Please start the animation of the second ring closure and look carefully at the mechanism. If necessary, repeat the animation. Then answer the question below.

Start of the animation of the second pericyclic ring closure.

Exercise

Which type of electrocyclic reaction represents the second ring closure in the biosynthesis of endiandric acid B shown in the animation?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

A conrotatory 6 π electron electrocyclization.

Sorry, that is not correct. The second ring closure is a disrotatory 6 π electron electrocyclization.

A disrotatory 8 π electron electrocyclization.

Sorry, that is not correct. The second ring closure is a disrotatory 6 π electron electrocyclization.

A conrotatory 4 π electron electrocyclization.

Sorry, that is not correct. The second ring closure is a disrotatory 6 π electron electrocyclization.

A disrotatory 6 π electron electrocyclization.

Yes, that is correct!

A conrotatory 8 π electron electrocyclization.

Sorry, that is not correct. The second ring closure is a disrotatory 6 π electron electrocyclization.

A disrotatory 4 π electron electrocyclization.

Sorry, that is not correct. The second ring closure is a disrotatory 6 π electron electrocyclization.

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