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1H NMR spectra of C1 in CDCl3 showing the time‐dependent formation of cis‐C1 and the reversible back‐isomerization upon UV irradiation (λ=365 nm) (top). 1H NMR of C1 in TCE‐d4 showing no isomerization over time (bottom; c=1×10−3 m, T=298 K).
