Oa. Attanasi et al., SYNTHESIS AND REACTIONS OF SOME 4-CHLORO-4-ALKOXYCARBONYL-1,2-DIAZA-1,3-BUTADIENES, Gazzetta chimica italiana, 127(4), 1997, pp. 201-205
The synthesis and some reactions of unknown 4-chloro-4-alkoxycarbonyl-
1,2-diaza-1,3-butadienes are reported. In particular, the preparation
of new 4,4-dichloro- and 4,4-dimethoxy-1H-pyrazol-5(2H)-one, as well a
s 4-chloro-5-alkoxypyrazole derivatives is described.