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A) Reaction of intermediates IIa⋅THF and IIa⋅py in [D6]benzene or [D5]pyridine. B) Reaction of intermediate [(VI⋅THF)2] in [D6]benzene or [D5]pyridine. C) Reaction of intermediate [(VI⋅py)2] in [D6]benzene to give a 1,4‐DHP species. Py/py=pyridine.
