1. A. Hessner and V. Alexanian, Tetrahedron Lett. 46:4475 (1978).
2. E. M. Barrall and J. F. Johnson in: “Liquid Crystals and Plastic Crystals,” G. W. Gray and P. A. Winsor, eds., Vol. II, E. Horwood, Chichester, England (1974), p. 303.
3. A. Doelman, A. R. Gregges and E. M. Barrall in: “Analytical Calorimetry,” R. S. Porter and J. F. Johnson, eds., Vol. 4, Plenum Press, New York, N.Y. (1976), p. 1.
4. H. K. Bücher, R. T. Klingbiel and J. P. Van Meter, Appl. Phys. Letters 25:186 (1974).
5. M. J. S. Dewar and R. M. Riddle, J. Am. Chem. Soc. 97:6658 (1975).