Unsymmetrical dibenzophenazine discotic mesogens were prepared via the corresponding tetraalkoxybenzil derivatives. These dibenzophenazines exhibit Colho phases over extremely broad temperature ranges.

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Pyrazine derivatives R 0550 Synthesis of Unsymmetrical Dibenzoquinoxaline Discotic Mesogens. -Title compounds (VII) are prepared via the corresponding tetraalkoxybenzil derivatives (IV) according to the scheme. The reduced symmetry of (VII) results in a shift of phase transition to lower temperature. -(FOSTER, E. J.; BABUIN, J.; NGUYEN, N.; WILLIAMS*, V. E.; Chem.

Pyrazine derivativesPyrazine derivatives R 0550 An Investigation of the Mesogenic Properties of Dibenzoquinoxaline Derivatives. -Triphenylene derivatives exhibit columnar liquid crystal phases. -(BABUIN, J.; FOSTER, J.; WILLIAMS*, V. E.; Tetrahedron Lett. 44 (2003) 37, 7003-7005; Dep. Chem., Simon Fraser Univ., Burnaby, B. C. V5A 1S6, Can.; Eng.) -K. Woydowski 52-171