The sigmatropic rearrangement involves the overlap of two LUMO orbitals.
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Q52: [6+4] cycloadditions are thermally forbidden.
Q53: Electrocyclic ring closures involve the loss of
Q54: A diene is activated with electron withdrawing
Q55: A [2+2] cycloaddition is thermally allowed.
Q56: SUMO orbitals are involved in photochemical cycloadditions.
Q58: [4+2] cycloadditions are photochemically forbidden.
Q59: Electrocyclic rearrangements are photochemically forbidden.
Q60: The Baeyer-Villiger oxidation converts ketones into esters.
Q61: Propose a mechanism for the following transformation.
Q62: Predict the reactants of the following cycloaddition
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