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Organophosphorus compounds are the class of organic compounds containing carbonphosphorus bonds. However, it is not necessary for the organophosphorus compounds to have direct phosphorus-carbon (P-C) bonds in order to be called an organophosphorus compound. Examples of phosphorus compounds are esters of organophosphorus acids (P(=O)(OR)3), phosphonic esters (RP(=O)(OR')2), phosphine oxides (R3P=O), phosphites (P(OR)3), organic fluorophosphate salts, organic phosphate salts, organophophorus acid halides, organophosphorus amides, organophosphorus complexes, and organophosphorus halides. Phosphines, phosphaalkenes, and phosphaalkynes are organophosphorus (III) compounds formed when phosphorus uses (1) three single bonds, (2) a double bond and a single bond and (3) a triple bond respectively for bonding.