| phosphonic | <chemistry> Pertaining to, or designating, certain derivatives of phosphorous acid containing a hydrocarbon radical, and analogous to the sulphonic acid. Origin: Phosphoric + sulphonic. Source: Websters Dictionary (01 Mar 1998) |
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| phosphonic acids | Inorganic or organic derivatives of phosphonic acid with the general formula rop(oh)2. This includes phosphonates and phosphonic acid esters. The tautomeric form of this compound (p(oh)3) = phosphorous acids. (12 Dec 1998) |