“…Blaser and Worms reported that another inorganic reagent, disodium diphosphonate (Na 2 P 2 H 2 O 5 ), reacts with several nucleophiles, such as monophosphate and fluoride, to form new compounds. 9,10 As shown in Fig. 1, DP is phosphonate, in which phosphorus has an oxidation state of +3, and thus this compound contains the P(III)-H bond, which is not found in the monophosphate.…”