Several hitherto unknown 3,5,7‐triaryl‐5,6‐dihydro‐4H‐1,2,5‐triazepines have been synthesised by cyclocondensation of N,N‐bis(phenacyl)anilines with hydrazine hydrate in ethanol or ethyleneglycol under reflux condition. Increased yields were obtained in the presence of p‐toluenesulfonic acid compared to the uncatalysed reaction.

Synthesis of Novel 3,5,7-Triaryl-5,6-dihydro-4H-1,2,5-triazepines. -The addition of catalytic amounts TosOH enhances the yield of cyclocondensation products (IV). -(RAVINDRAN, G.; MUTHUSUBRAMANIAN*, S.; SELVARAJ, S.; PERUMAL, S.; J. Heterocycl. Chem. 44 (2007) 1, 133-136; Dep. Org. Chem., Madurai Kamaraj Univ., Madurai 625 021,Tamil Nadu, India; Eng.) -H. Haber 23-167

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Pyrazine derivatives R 0550Solventless Synthesis of 2,4,10a-Triaryl-1,10a-dihydro-2H-pyrazino[2,1-b][1,3]benzoxazole. -(RAVINDRAN, G.; MUTHUSUBRAMANIAN*, S.; SELVARAJ, S.; PERUMAL, S.; Indian J.