Recyclization of 1-acyl(thioacyl)-5-hydroxy-2-pyrazolines to 1,3,4-oxa(thia)diazol-2-ine derivatives on acetylation

@article{Zelenin1999RecyclizationO1,
  title={Recyclization of 1-acyl(thioacyl)-5-hydroxy-2-pyrazolines to 1,3,4-oxa(thia)diazol-2-ine derivatives on acetylation},
  author={Kirill N. Zelenin and Vladimir V. Alekseev and Alexander K. Zelenin and Yu. S. Sushkova},
  journal={Chemistry of Heterocyclic Compounds},
  year={1999},
  volume={35},
  pages={87-92}
}
The acetylation of 1-acyl(thioacyl)-5-hydroxy-2-pyrazoline produces recyclization to the corresponding acyl-5-(2-oxoalkyl)-1,3,4-oxa(thia)diazol-2-ine.