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|Section2= |Section3= }} In chemistry, pyrophosphate is a phosphorus oxyanion. Compounds such as salts and esters are also called pyrophosphates. The group is also called diphosphate or dipolyphosphate, although this should not be confused with two phosphates. As a food additive, diphosphates are known as E450. As well as the normal pyrophosphates, a number of hydrogen pyrophosphates also exist, such as Na2H2P2O7. == Chemistry == Pyrophosphates were originally prepared by heating phosphates (''pyro'' from the Greek, meaning "fire"). Pyrophosphates generally exhibit the highest solubilities among the phosphates;〔C.Michael Hogan. 2011. (''Phosphate''. Encyclopedia of Earth. Topic ed. Andy Jorgensen. Ed.-in-Chief C.J.Cleveland. National Council for Science and the Environment. Washington DC )〕 moreover, they are good complexing agents for metal ions (such as calcium and many transition metals) and have many uses in industrial chemistry. Pyrophosphate is the first member of an entire series of polyphosphates. The term pyrophosphate is also the name of esters formed by the condensation of a phosphorylated biological compound with inorganic phosphate as for dimethylallyl pyrophosphate. This bond is also referred to as a high-energy phosphate bond. The synthesis of tetraethyl pyrophosphate was first described in 1854 by Philippe de Clermont at a meeting of the French Academy of Sciences. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pyrophosphate」の詳細全文を読む スポンサード リンク
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