A3- and A4-1,2,3-Triazolines

This article, which covers the literature up to 1983, endeavors to present a comprehensive, unified survey of the methods of synthesis and reactions of A2-1,2,3-triazolines. The chemistry of mono-, bi-, and polycyclic triazolines, as well as that of spiro- and bistriazolines, is considered. The 1,2,3-triazo-linones are not included, but a brief account of the chemistry of A3- and A4-1,2,3-triazolines is given.14... 

The chemistry of A3- and A4-1,2,3-triazolines is still in its beginnings and few reactions have been reported. 

Both A3- and A4-l,2,3-triazolines have the 1//-structure, although A3-triazolines may be considered as the 1,5-dihydro derivatives of 2H- 1,2,3-triazoles22 the parent compound of neither triazoline is known. 

Most known 1,2,3-triazoline chemistry is of the A2-compounds few studies concern the A3- and A4-compounds. In 1959, Mohr and Hertel first described several A4-1,2,3-triazoline intermediates.2 Despite a previous assignment of a A4-triazoIine structure for the phenyl azide-acrylonitrile... 

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