¤@.Pyrolysis of 2-thiomethoxystyrylarenes 15a-c gave 2-(aryl-2-yl)benzo[b]arenes 22a-c and their isomers 23a-c and polycyclic aromatic hydrocarbons (PAH) 24a-c, respectively. Furthermore, pyrolysis of 15c also gave compounds 42¡B43¡B44 by breaking C-N single bond of 15c at higher temperature. In addition, photolysis of 15a-c gave photocyclic products 24a-c and 32a-c, respectively. ¤G.Pyrolysis of 2-(3-phenylpropenyl)anisole(18) and 2-(1-phenyl)anisole (19) gave 2-phenylbenzo[b]furan (13)¡Bbenzofuran (27)¡Bethylbenzene (28) and dibenzyl (29) as the main products. ¤T.Attempts to prepare hexaazatriphenylene derivatives 3 were carried by condensation between diamino dihydropyrazine compound 2 and hexaketocyclohexane (1).

The common discotic mesogen molecules are known to have a flat structure, comprising a rigid core, e.g., polynuclear aromatic structure, and a ring of four to nine flexible aliphatic side chains. We take the electron deficient heterocyclic hexaazatriphenylene (HAT) as our central core and readily synthesized by the condensation of hexaketocyclohexane with the respective 1,2-bis-alkoxy-4,5-diaminobenzene. The new molecules with electron deficient discotic liquid crystal properties are successfully.

We take the electron deficient heterocyclic hexaazatriphenylene (HAT) as our central core and readily synthesized by the condensation of hexaketo- cyclohexane with the respective 1,2-bis-alk-oxy-4,5-diaminobenzene. We use the polarised optical microscopy (POM) and differential scanning calorimetry (DSC) to study the mesophase range.These mesophases are identified as columnar phases by diffraction (XRD).