Periodic Acid
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There are two oxoacids referred to as periodic (pronounced per-iodic) or iodic (VII) acid:
1. Molecular formula: HIO4
Structural formula:
2. Molecular formula: H5IO6, also shown as HIO4 • 2 H2O
Structural formula:
Hydration of HIO4 gives H5IO6 and dehydration of H5IO6 gives HIO4.
The commercially available periodic acid is usually H5IO6.
Periodic acid is a strong oxidizing agent, commonly used to oxidize glycols.
eg:
see also periodate ester, hydroxylation