Electrocyclic ring closures involve the loss of a ð bond.
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Q48: Ketenes are capable of [2+2] thermal cycloadditions
Q49: Ozone transforms an alkene into carbonyls.
Q50: A dieneophile is activated with electron withdrawing
Q51: A reaction of an alkyne and an
Q52: [6+4] cycloadditions are thermally forbidden.
Q54: A diene is activated with electron withdrawing
Q55: A [2+2] cycloaddition is thermally allowed.
Q56: SUMO orbitals are involved in photochemical cycloadditions.
Q57: The sigmatropic rearrangement involves the overlap of
Q58: [4+2] cycloadditions are photochemically forbidden.
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