ChemInform Abstract: Synthesis and Liquid Crystalline Properties of Substituted 1,4‐Bis(2‐pyrimidinyl)benzenes.

Abstract

Starting with the amidine (I), the symmetrically (III), (VIII), and (XII) or unsymmetrically substituted bispyrimidinylbenzenes (X) and (XIII) are prepared as shown in the reaction scheme.

Cyclometallated nitrogen heterocycles

“…When the pyrimidines were mixed with one equivalent of the metallated Schiff's base compound 21 no reaction took place. If, however, the metallated N ,N -dimethylbenzylamine (22) was reacted with the pyrimidine ligands then a small amount of what we believe to be a dimetallated pyrimidine compound 23 or 24 was identified by 1 H-NMR (Scheme 5). It is not clear which of the two possible isomers is formed, as the NMR spectrum for both will be very similar.…”