4-Alkoxy-4′-(Alkyl or Alkoxy)-2- Hydroxy-α, α'-Dimethylbenzalazines (III); Some Interesting Mesomorphic Compounds

Two new series of compounds that have mesomorphic properties were synthesized: the 4-alkoxy-4′ -alkyl-2-hydroxy-α, α'-dimethyl-benzalazines and the 4-alkoxy (n)-4′-alkoxy(m)-2-hydroxy-α, α'-dimethylbenzalazines. Thermodynamic measurements were made, all the compounds gave lower melting points and larger mesophase ranges than the symmetrically substituted compound. The dialkoxy (n-m)substituted compounds exhibit polymorphism in the solid state.