Wei, Wei published the artcileMetal-free molecular iodine-catalyzed direct sulfonylation of pyrazolones with sodium sulfinates leading to sulfonated pyrazoles at room temperature, Safety of 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, the publication is Organic Chemistry Frontiers (2017), 4(1), 26-30, database is CAplus.
A simple and convenient mol. iodine-catalyzed direct sulfonylation of pyrazolones with sodium sulfinates has been developed in the presence of TBHP at room temperature This methodol. can allow for the synthesis of a series of valuable sulfonated pyrazoles, e.g., I in good to excellent yields simply using readily-available starting materials without requiring any metal or cryogenics.
Organic Chemistry Frontiers published new progress about 14580-22-4. 14580-22-4 belongs to pyrazoles-derivatives, auxiliary class Organic Pigment, name is 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, and the molecular formula is C11H10O, Safety of 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics