18211-68-2Relevant academic research and scientific papers
Once again the question of cyclization of pyrazolones-5 unsubstituted at the nitrogen into tripyrazolylenes
Grandberg,Nam,Sorokin
, p. 623 - 624 (1998)
The experimental data were refined and the yields were improved significantly in cyclization of pyrazolones-5 into tripyrazolylenes-1,5 with phosphorus oxychloride. 1998 Plenum Publishing Corporation.
NEW TYPE OF CONDENSATION OF 5-PYRAZOLONES UNSUBSTITUTED AT THE NITROGEN
Grandberg, I. I.,Nam, N. L.
, p. 540 - 543 (2007/10/02)
1,5-Tripyrazolylenes were prepared with satisfactory yields by the reaction of 5-pyrazolones unsubstituted at the nitrogen atom with an equimolar amount of POCl3 in open vessels together with 5-chloro derivatives (Michaelis reaction).
