The author of 《Synthesis of 2,3-diaryl-2,3,4,4a-tetrahydro-5H-indeno[1,2-c]pyridazin-5-ones》 were Chagarovskiy, Alexey O.; Strel’tsova, Elena D.; Rybakov, Victor B.; Levina, Irina I.; Trushkov, Igor V.. And the article was published in Chemistry of Heterocyclic Compounds (New York, NY, United States) in 2019. Name: Trimethylsulfoxonium iodide The author mentioned the following in the article:
The nucleophilic cleavage of spiro[cyclopropane-1,2′-indane]-1′,3′-diones with phenylhydrazine in the presence of catalytic amounts of scandium triflate led to the formation of indeno[1,2-c]pyridazine derivatives I [R = Ph, 4-MeC6H4, 4-FC6H4, etc.]. The experimental process involved the reaction of Trimethylsulfoxonium iodide(cas: 1774-47-6Name: Trimethylsulfoxonium iodide)
Trimethylsulfoxonium iodide(cas: 1774-47-6) reacts with sodium hydride to prepare dimethyloxosulfonium methylide, which is used as a methylene-transfer reagent in synthetic chemistry. It is used to prepare ylide, which reacts with carbonyl compounds to get epoxides. Further, it reacts with alfa,beta-unsaturated esters to get cyclopropyl esters.Name: Trimethylsulfoxonium iodide
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com