From Wikipedia, the free encyclopedia
- 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.
- dictionary.reference.com: meta-
- Sir William Crookes: Chemical news and journal of industrial science, Volume 31 PD @ books.google. 1875; p.76 PDF: