Fig. 4
Crystal structures of the enol-(S)-1 crystal in the three phases. a–f Molecular conformations of independent molecules at a, d α-, b, e β-, and c, f γ-phases. a–c ORTEP figures are drawn by thermal ellipsoids with 25% probability. Two independent molecules in α- and β-phases are shown in green (molecule 1) and yellow (molecule 2), and an independent molecule in the γ-phase is drawn in green due to its similarity to molecule 1. The conformations of disordered tert-butyl substituents are shown in magenta (conformation A) and blue (conformation B). d–f Molecular conformations viewed parallel to the salicyl plane. Hydrogen atoms and tert-butyl bonds with minor occupancy are omitted for clarity. g Dihedral angle between salicyl and naphthyl planes. h Occupancy of conformation A of disordered tert-butyl substituents. i Molecular packings on the (100) face at α-, β-, and γ-phases
