“…[346][347][348][349][350][351][352][353] Dandia et al reported the synthesis of pyrazolones (302) from substituted ethyl acetoacetate (63h) and substituted hydrazine (64b) under solvent-free conditions using IR irradiation catalyzed by cobalt-doped zinc sulphide nanoparticles (Codoped ZnS NPs, Scheme 194). 354 The same protocol was explored for the synthesis of 1,3-oxathiolan-5-ones (304) from 2thioacetic acid (303) and substituted aldehyde or ketones (9b) in 76-96% yield. The co-doped ZnS NPs were prepared using a green aqueous chemical method following the literature reported procedures 355,356 and characterized via XRD, TEM, EDAX, ICP-AES and UV-Vis spectroscopy.…”