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Stabilization of norcaradiene structures of γ-lactone and lactam ring-fused 7-vinylnorcaradienes 1a–1e in their norcaradiene – cycloheptatriene valence isomerization was achieved by protonation. Induced 13 C NMR chemical shifts caused by protonation were monitored for the cyclopropane ring carbons (C1, C6 and C7) of the norcaradiene structures as indices of their stabilities. DFT calculations...