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Meta- (chemistry) : ウィキペディア英語版
Meta- (chemistry)

In chemistry, meta is a prefix, used for systematic names in IUPAC nomenclature. It has several meanings.〔dictionary.reference.com: (meta- )〕
*In organic chemistry, meta indicates the positions of substituents in aromatic cyclic compounds. The substituents have the 1,3-positions, for example in resorcinol.
*Meta may also denote the dehydrated form of an acid, salt or organic derivative in a series.
:For example metabisulfite:
:2 bisulfite (HSO3) → 1 metabisulfite S2O52− + H2O
:and metaphosphoric acid:
:3 orthophosphoric acid H3PO4 → 1 trimetaphosphoric acid (H3P3O9) + 3 H2O.
:Meta-antimonic acid, the dehydrated form of antimonic acid (H3SbO4), is HSbO3.〔Sir William Crookes: (Chemical news and journal of industrial science, Volume 31 ) PD @ books.google. 1875; p.76 PDF: ()〕
==See also==

*Arene substitution patterns

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