Fused to two heterocyclic rings

Condensed 1,2,4-Triazines II. Fused to Heterocycles with Six- and Seven-Membered Rings and Fused to Two Heterocyclic Rings... 

The final chapter is Part II of the survey of condensed 1,2,4-triazines and is authored by E. S. H. El Ashry, N. Rashed, A. Mousaad, and E. Ramadan of Alexandria University, Egypt. The same group wrote Part I in Volume 59, which covered 1,2,4-triazines fused to heterocycles with 3-, 4-, and 5-membered rings. Part II continues the survey to cover 1,2,4-triazines fused to 6- and 7-membered rings and also those fused to two heterocyclic rings. 

El Ashry, E. S. H., Rashed, N., Mousaad, A., Ramadan, E., Condensed 1, 2, 4-Triazines II. Fused to Heterocycles with Six- and Seven-Membered Rings and Fused to Two Heterocyclic Rings, 61,207. 

Chapter 14. Heterocycles Fused to Two Benzene Rings 1. Central Rings Containing One 409... 

The third chapter of this volume is concerned with mono- and diazaquinones. S. R dl (Prague, Czech Republic) reviews compounds that contain one nitrogen or two nitrogen atoms directly within the quinonoid ring, a subject that has not been previously summarized in a comprehensive manner. This is in distinction to the several specialized reviews of quinones themselves. Heterocyclic quinones, in the sense of compounds in which the quinonoid ring is fused to a heterocyclic ring, were covered in Volume 45 of our series in 1989. 

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