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Pentafluorophenylchlorocarbene, generated by laser flash photolysis (LFP) of pentafluorophenylchlorodiazirine, formed π-type complexes with 1,3,5-trimethoxybenzene in pentane. The carbene and carbene complexes were in equilibrium with K = 3.21 × 10(5) M(-1) at 294 K. From the temperature dependence of K, ΔH° = -10.2 kcal/mol, ΔS° = -9.5 eu, and ΔG° = -7.4 kcal/mol at 298 K. The carbene complexes were characterized by UV-vis spectroscopy and computational analysis.
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Moss et al. (2011) studied this question.
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