Synthesis and Thermal Properties for 4-(4-Alkoxyphenoxycarbonyl)phenyl 3-Alkoxy-2-X-benzoates

ABSTRACT

Some derivatives of 4-(4-alkoxyphenoxycarbonyl)phenyl 3-alkoxy-2-X-benzoates (X = F, Cl, Br, or CF₃) were synthesized by means of an ortho-directed lithiation followed by an electrophilic aromatic substitution reaction, as a key step, and their thermal properties of liquid crystals were examined. These results are discussed in terms of molecular structure and electrostatic effects.

Keywords:

• binary phase diagram
• lateral substituent
• liquid crystals
• nematic phase
• synthesis

Acknowledgments

This work is partially supported by Electric Technology Research Foundation of Chugoku.

Notes

C, N, and I indicate crystal, nematic, and isotropic phases, respectively.

Parentheses and brackets indicate a monotropic and virtual transitions, respectively.

*1, See ref. [6];

*2,The latent heat could not be detected by a DSC thermogram on rapid cooling process.