Compound (2E,4Z,6Z,8E)-2,4,6,8-decatetraene has been cyclized to give 7,8-dimethyl- 1,3,5-cyclooctatriene. Predict the manner of ring-closure-conrotatory or disrotatory-for boththermal and photochemical reactions and predict the stereochemistry of the product in eachcase. Show the outermost molecular orbital cyclizaion.

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Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter14: Conjugated Compounds And Ultraviolet Spectroscopy

Section14.SE: Something Extra

Problem 62AP

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(2E,4Z,6Z,8E)-decatetraene has been cyclized to give 7,8-dimethy-1,3,5-cyclooctatriene. Predict the manner of ring-closure conrotatory or disrotatory for both thermal and photochemical reactions, and predict the stereochemistry of product in each case. Show how to get the answer
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