Ortho acid

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Ortho acids are the most hydroxylated acid in a set of oxoacids, such as orthophosphoric acid. In general, when an element can form several oxoacids, these are called ortho-, meta- or pyroacids, with the ortho acid being the most hydrated of the three.[1]

Organic ortho acids resemble hydrated carboxylic acids having the general structure RC(OH)3; orthocarbonic acid (C(OH)4) is generally considered a member.[2] These compounds are unstable, however their corresponding orthoesters (RC(OR’)3) have reasonable stability and possess a rich chemistry. The equivalent nitrogen compounds are also hypothetical with guanidines being the closest real-world analogues.

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  1. ^ Prakash, Satya (1945). Advanced inorganic chemistry. New Delhi: S. Chand & Company Ltd. p. 733. ISBN 9788121902632. 
  2. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006–) "ortho acids".