Behavior of hydrazonoyl chlorides towards the C=N double bond of Delta(2)-pyrazolines. A study on 2-(4-nitrophenyl)-2,3,3a,4,5,6-hexahydro-6-oxofuro[3,4-c]pyrazole

Abstract

The reaction between title compound (3) and hydrazonoyl chlorides (4) was performed in the presence of triethylamine or silver salts. The product output was quite different depending upon the basic agent and, besides the formation of the novel pyrazolo[4,5-b]furo[3,4-c]pyrazole skeleton, a new degradative behavior of the pyrazoline ring has been observed