1.2.4- Triazoline-3-thiones, condensation

With heterocyclic nitrogen containing rings, with a 2-hydrazino group and formation of condensed l,2,4-triazoline-3-thiones. . . 569... 

Heterocyclic rings which, in the 2-position of the nitrogen in the ring, also contain a hydrazino group (XLI), react very readily with carbon disulfide to the corresponding dithiocarbazates (XLII). These, in the presence of a base, cyclize to the condensed l,2,4-triazoline-3-thiones (XLIII). 

Although the chemistry of AZ-aminoazoles spans a century, it has not yet received an overall treatment therefore this first review is inevitably rather extensive. However, previous reviews particularly devoted to N-aminoazinium salts [81 AHC(29)7I] and A-imines of type 4 [72ZC250 74AHC( 17)213] touched some aspects of the chemistry of A-aminoazolium salts. Besides, Beyer summarized his investigation on the chemistry of some A-aminoimidazoles (70ZC289), and Molina did the same on syntheses of condensed systems from 4-amino-j-triazoline-3-thione (86BSB973). 

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