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Only dienes that can adopt the s-cis conformation undergo facile Diels-Alder reactions. Any substitution pattern which favors the s-trans isomer slows down the cycloaddition. Explain

Only dienes that can adopt the s-cis conformation undergo facile Diels-Alder reactions. Any substitution pattern which favors the s-trans isomer slows down the cycloaddition". Explain the above-mentioned statement using ONE suitable example.

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