Question

The D-site loses this structure due to distortion by Glu and Asp side chains in the mechanism of lysozyme. The Zimmerman-Traxler model predicts the aldol reaction's stereochemistry (-5[1])by assuming the transition state has this specific structure (15[2])and analyzing (15[1])the steric interactions. (15[1])Transition states with this structure are thermodynamically (-5[1])favored for [3+3]-rearrangements like the Claisen and (*) Cope rearrangements. (-5[1])The Newman projection for this conformation is fully staggered, (-5[2])while it is fully gauche for a different conformation (-5[1])that experiences (10[1]-5[1])■END■ (10[1])

ANSWER: chair conformation [prompt on ring or cyclic structure; prompt on cyclohexane]
<JZ, Chemistry>
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