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why is urea used in the chromium acetylacetonate synthesis laboratory ?

why is urea used in the chromium acetylacetonate synthesis laboratory ?

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Answer #1

To remove the acidic hydrogen on the central carbon in the acetylacetone before it will make a comple after chelating to the chromium(III). . The urea possible reacts with water to yield CO2, ammonium ion, and hydroxide ion. The hydroxide ion then reacts with the acetylacetone, abstracting the hydrogen on the central carbon, producing the acac- ion.

The reactions involved are

(H2N)2CO + 3 H2O = CO2 + 2 NH4+ + 2OH-
CH3COCH2COCH3 + OH- = acac- + H2O
CrCl3.6H2O = Cr3+ + 3Cl- + 6H2O
Cr3+ + 3acac- = Cr(acac)3

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