Formaldehyde → HCID 18448695, compound

Participants

Reaction Steps

5 equivalent of a sodium methylate (30% solution in methanol) was rapidly added to a suspension of 0.437 g of Fipronil and 1.4 equivalent of paraformaldehyde in 3 mL of methanol to provide the 3-Cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-hydroxymethylamino-4-trifluoromethylsulfinylpyrazole (Compound V) after 3 hour at 20° C. and 1 hour at 60° C. Then 1 equivalent of sodium borohydride was added to the medium which provide after classical extraction and chromatography separation the 3-Cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-methylamino-4-trifluoromethylsulfinylpyrazole (Compound I).

Provenance & Evidence