(from preface)
Volume 50 of Advances in Heterocyclic Chemistry comprises four chapters. Howard D. Perlmutter has contributed a survey of 1,2- and 1,3-diazocines. This is the fourth in a series of reviews by Perlmutter» whose previous surveys include azocines (Volume 31,1982), 1,4-diazocines (Volume 45, 1989), and 1,5-diazocines (Volume 46, 1989). The present chapter completes this treatment of eight-membered heterocycles containing nitrogen.
R. E. Busby has written a chapter on thiadiazines containing adjacent sulfur and nitrogen ring atoms. This chapter complements one in Volume 44 which dealt with sulfamides of this type. H. Quiniou and O. Guilloton of Nantes have covered the chemistry of monocyclic 1,3-thiazines, a group that, surprisingly, has not been reviewed comprehensively for many years. Finally, E. V. Kuznetsov and I. V. Shcherbakova of Rostov collaborate with A. T. Balaban of Bucharest in a summary of the chemistry of benzo[c]pyrylium salts. This review complements the review by a group of authors under the leadership of Balaban who covered the chemistry of pyrylium salts in Supplement 2 of this series, which appeared in 1982.