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Abstracts of Congress of Heterocyclic Chemistry | Regular issue | Vol 14, No. 10, 1980, pp.1677-1702
Published online, 1st January, 1970
DOI: 10.3987/R-1980-10-1677
Some Recent Advances in the Synthesis of Three-Membered Ring Heterocycles

Helmut Quast*

*Institut für Organische Chemie, Universität Wurzburg, Am Hubland D-97074 Wurzburg, Germany


The syntheses of some three-membered rings containing phosphorus(V) or sulfur(Vl) and of nitrogen analogs of methylene-cyclopropane, viz. methylenaziranes, iminoaziranes, and imino-diaziranes, are reviewed. Furthermore, an account is given of the photo-extrusion of nitrogen from 1-pyrazolines and tetrazolines both having exocyclic double bonds, which in most cases leads to the formation of methylenecyclopropane analogs.