Volume 48 of Advances in Heterocyclic Chemistry consists of five chapters
that break considerable new ground for the series. Oae and Furukawa
have contributed what is essentially a double chapter dealing with two
important and fast-developing aspects of sulfur heterocyclic chemistry.
The first is ligand coupling and exchange in sulfuranes and the second is
ipso-substitution in S-substituted heterocyles. Cirrincione, Almerico,
Aiello, and Dattolo cover diazoazoles. This complements a chapter by
Tedder that appeared in Volume 1 of the series but which is now very much
outdated. The subject has expanded greatly, and the Palermo authors have
much fascinating chemistry to recount.
The elegant cobalt-catalyzed syntheses of pyridines, on which so much
work has been done at Muelheim, is aptly summarized by Bonnemann and
Brijoux. Elnagdi, Elmoghayer, and Sadek complete in this volume a survey
of heterocycles containing condensed pyrazole ring systems. Thus,
following earlier chapters that have appeared on pyrazolopyridines (Volume
36) and on pyrazolopyrimidines (Volume 41), we now have a complete
survey of systems in which a pyrazole ring is condensed with another
five- or six-membered heteroaromatic ring