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Hexol is a cobalt compound that was first prepared by Alfred Werner in 1914 and represented the first non-carbon-containing chiral compound. The salt with the molecular formula of [Co((OH)2Co(NH3)4)3](SO4)3 was prepared starting from cobalt(II) sulfate.

Optical resolution of this compound was possible by treating the hexol chloride salt with the resolving agent silver d(+)-bromocamphorsulphonate in dilute acetic acid. The d-Hexol salt precipitated out from solution and the filtrate contained the l-hexol species. Werner also published a second achiral hexol (a minor byproduct from the production of Fremy's salt) that he incorrectly identified as a linear trimer.

In 2004 the second hexol was reinvestigated and found to be a hexanuclear species.


  • A. Werner, H. Kuh, P. Wust Ber. 1914, 47, 196
  • The rediscovery of Alfred Werner's second hexol W. Gregory Jackson, Josephine A. McKeon, Margareta Zehnder, Markus Neuberger and Silvio Fallab Chemical Communications, 2004, (20), 2322 - 2323 Abstract
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hexol". A list of authors is available in Wikipedia.
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