Whereas the position of the E,E/E,Z equilibrium for 1,3-diphenylallyl-lithium in tetrahydrofuran is highly photosensitive, the corresponding equilibrium in liquid ammonia appears to be unaffected by light. N.m.r. measurements for the sodium salt in this solvent between –20 and +20 °C yield a ΔH value for the E,E to E,Z conversion of ca. 6.9 ± 1.0 kJ mol–1.
R. J. Bushby, J. Chem. Soc., Perkin Trans. 2, 1980, 1419 DOI: 10.1039/P29800001419
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