G. Kumaravel et al., THERMOTROPIC PROPERTIES OF HEMICHOLINIUM AND RELATED LIPIDS, Journal of the Chemical Society, Chemical Communications, (11), 1993, pp. 905-907
Cationic morpholine lipids 1 and 6 undergo complex phase transition pa
tterns and exhibit metastable phases; lipids 1, 2 and 6 become thermot
ropic liquid crystals through the first phase transition temperatures,
whereas 5 and 7 lose birefringence and become opaque solids.