Synthesis of Gold Complexes From Diphosphine Ligands and Screening Reactions of Heterocyclic Acetylacetonato (ACAC) Ligands with Transitional Metal Complexes Page: 27
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1.6.3.2 Acetylacetonate (acac) in Oxidation of Hydrocarbon
The acac ligand shows catalytic activities when complexed with transition metal elements
such as vanadium. VO(acac)2 is a commonly used catalyst in the oxidation of anthracene or any
polyaromatic hydrocarbon. Hydrogen peroxide is an oxidizing agent in this reaction, but the
reaction happens only in the presence of VO(acac)2.50 The product of this reaction is ketone, and
the catalyst itself can be prepared from reaction between hydrated VOSO4 and 2, 4-pentanedione
in the presence of sodium carbonate and water.51
1.6.3.3 Acac in Polymerization
Al(acac)R2 where R=CF3 has been reported to have catalytic activities in the
polymerization of epoxides. 52 In addition, in recent years much attention has been focused on
the potential use of aluminum alkoxide complexes derived from a fluorinated acac ligand. Such
complexes are known to have catalytic activities in ring opening polymerization (ROP) of cyclic
esters such as c-caprolactone and lactide. The catalyst has been found to exhibit a high degree of
control over polymerization. The polyester produced tends to have a narrow molecular weight
distribution and controlled molecular weight. Also, polymerization results in well-controlled
stereochemistry. For instance, racemic lactide monomers have been used to produce isotactic-
containing polylactides.52
Co(acac)2 is another catalyst which has now been employed in the polymerization of
vinyl acetate. Traditionally, poly(vinyl acetate) or PVAc has been produced largely by radical
polymerization of its monomer vinyl acetate, although coordination polymerization has been
used successfully in the production of copolymers with a limited incorporation of vinyl acetate.
The use of the radical polymerization of vinyl aceate suffers one serious setback: the radical27
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Nyamwihura, Rogers. Synthesis of Gold Complexes From Diphosphine Ligands and Screening Reactions of Heterocyclic Acetylacetonato (ACAC) Ligands with Transitional Metal Complexes, thesis, August 2015; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc804890/m1/40/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .