phosphonicoxide
Phosphonicoxide is a hypothetical chemical compound that represents a theoretical extension of the phosphonic acid functional group. Phosphonic acids have the general formula R-P(O)(OH)2, where R is an organic group and P(O)(OH)2 is the phosphonic acid moiety. Phosphonicoxide could be envisioned as a compound where the oxygen atoms of the phosphonic acid group are further oxidized or modified in some way, or perhaps where the phosphorus-oxygen double bond is replaced by a peroxide linkage. However, phosphonicoxide is not a recognized or standard chemical term in established nomenclature.
In organic chemistry, the phosphonate ester, R-P(O)(OR')2, and phosphonic acid, R-P(O)(OH)2, are well-defined functional groups. These