Two methods for the synthesis of (2-mercaptophenyl)phosphonic acid

Article abstract of DOI:10.1055/s-1993-25889

(2-Mercaptophenyl)phosphonic acid is prepared by hydrolysis of dialkyl (2-mercaptophenyl)phosphonate, which is itself formed either by reaction of dialkyl chlorophosphate with lithium 2-lithiobenzenethiolate, or from the lithiated derivative of the readily prepared O,O-diisopropyl S-phenyl thiophosphate whose phosphoryl group then undergoes an S → C migration.