The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Fractional sublimation of various metal chelates of dipivaloylmethane》. Authors are Berg, Eugene W.; Herrera, Nicolas M..The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Category: esters-buliding-blocks. Through the article, more information about this compound (cas:14481-08-4) is conveyed.
Twenty different metal chelates of dipivaloylmethane were prepared and characterized by m.ps., C-H analyses, and ir and NMR spectral data. The pure chelates were sublimed in the Berg fractional vacuum sublimator and the temperature condensation (sublimation) zones were recorded for each chelate under standardized conditions. The Be chelate was the most volatile and the lanthanide and actinide chelates among the least volatile dipivaloylmethanates. The only volatile alk. earth metal chelates were those of Be and Mg; the Ca, Sr, and Ba chelates were not volatile under the conditions used. Overall the chelates of dipivaloylmethane exhibited volatilities similar to those of the corresponding metal acetylacetonates but less than those of the trifluoroacetylacetonates and the hexafluoroacetylacetonates. The chelates of benzoylacetone, benzoyltrifluoroacetone, and thenoyltrifluoroacetone are less volatile than the corresponding chelates of dipivaloylmethane. The data suggest that some 64 different binary and ternary mixtures of metal dipivaloylmethane chelates can be quant. separated Seven binary and 3 ternary mixtures of the metal chelates were separated satisfactorily.
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Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics