The Fascinating Acetylacetone Molecule and Its Acetylacetonate Salts

Chemistry, Technology
[caption id="attachment_20255" align="alignright" width="400"] Cobalt III Acetylacetonate[/caption] Acetylacetone is the simplest of the β-diketones and supports the phenomenon we call keto-enol tautomerism (see the illustration). Notice that the third carbon atom in the 5-carbon keto chain loans one of its hydrogen atoms in forming the enol tautomer. The freedom to move of this hydrogen atom suggests acetylacetone is a weak acid.1 In effect, the saturated di-ketone becomes an unsaturated di-alcohol. Only instead of two hydrogen atoms, one to each oxygen atom, there is just the one hydrogen atom that must be shared. Preparation Commercially, acetylacetone or H(acac) can be prepared from isopropenyl acetate by heating it in the presence of an appropriate metal catalyst. Dissociation and Reaction Since it is an acid, it can ionize or "disassociate", giving a positive…
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Chemicals With the Same Empirical Formula

An empirical formula lists the elements of a compound but not the structure. Oxalic acid has the formula C2H2O4. Its structure is HOOC–COOH. Multiple compounds can have the same empirical formula and a different structure. The Same Yet Different Location of a specific kind of bond may make the difference. There are compounds with the same empirical formula in which spatial orientation is the only difference. Sometimes one structure can be changed into another structure of the same formula. Most often compounds having the same formula but different structures are completely unrelated. Simple Bond Shift In some cases, a simple bond shift produces different structures with no formula change. An example is 1-butene and 2-butene. The first has the structure H2C=CH-CH2-CH3. The second has the structure H3C-CH=CH-CH3. Both have the…
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