A. Zoran et al., PHOSPHINIC ACID AS A BIFUNCTIONAL REAGENT IN THE CATALYTIC BAMBERGER REARRANGEMENT OF NITROBENZENE TO PARAAMINOPHENOL, Journal of the Chemical Society, Chemical Communications, (19), 1994, pp. 2239-2240
Phosphinic acid is proposed as a simultaneous hydrogen donor and proto
n source in the Pd/C catalysed transformation of nitrobenzene to para-
aminophenol.