In organic chemistry, ortho acids are organic, hypothetical chemical compounds having the structure R−C(OH)3 (R = alkyl or aryl).
[1] Ortho acids themselves are unstable and cannot be isolated.
However, ortho esters can be synthesized by the Pinner reaction, in which nitriles react with alcohols under acid catalysis: Historically the prefixes "hypo-", "per-", "ortho-", "meta-", and "pyro-" were used to distinguish between different oxyacids of the same element, of these ortho acid is the most highly oxidised or hydroxylated.
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