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2. Chromium compounds - Wikipedia

   en.wikipedia.org/wiki/Chromium_compounds

   Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals. The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium are rare, but do nevertheless occasionally exist. [3] [4]

3. Oxidation with chromium(VI) complexes - Wikipedia

   en.wikipedia.org/wiki/Oxidation_with_chromium(VI...

   Enones can be synthesized from tertiary allylic alcohols through the action of a variety of chromium(VI)-amine reagents, in a reaction known as the Babler oxidation. The reaction is driven by the formation of a more substituted double bond. (E)-Enones form in greater amounts than (Z) isomers because of chromium-mediated geometric isomerization ...

4. Chromate and dichromate - Wikipedia

   en.wikipedia.org/wiki/Chromate_and_dichromate

   The primary chromium ore is the mixed metal oxide chromite, FeCr 2 O 4, found as brittle metallic black crystals or granules. Chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the hexavalent form, while the iron forms iron(III) oxide, Fe 2 O 3:

5. Chromium(III) oxide - Wikipedia

   en.wikipedia.org/wiki/Chromium(III)_oxide

   Chromium(III) oxide is amphoteric. Although insoluble in water, it reacts with acid to produce salts of hydrated chromium ions such as [Cr(H 2 O) 6] 3+. [11] It is also attacked by concentrated alkali to yield salts of [Cr(OH) 6] 3−. When heated with finely divided carbon or aluminium, it is reduced to chromium metal: Cr 2 O 3 + 2 Al → 2 Cr ...

6. Metal acetylacetonates - Wikipedia

   en.wikipedia.org/wiki/Metal_acetylacetonates

   Chromium(III) acetylacetonate, Cr(acac) 3, is a typical octahedral complex containing three acac − ligands. Like most such compounds, it is highly soluble in nonpolar organic solvents. Like most such compounds, it is highly soluble in nonpolar organic solvents.

7. Hexavalent chromium - Wikipedia

   en.wikipedia.org/wiki/Hexavalent_chromium

   Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent). [1] It has been identified as carcinogenic, which is of concern since approximately 136,000 tonnes (150,000 tons) of hexavalent chromium were produced in 1985. [ 2 ]