10.1016/j.ica.2010.05.009
The study focuses on the synthesis and characterization of five new Ni(II) complexes with aroyl hydrazone ligands derived from 2,6-diacetyl pyridine monooxime. The complexes were found to have a distorted octahedral N4O2 coordination environment around the Ni(II) ion, with the ligands coordinating through the pyridine nitrogen, imino-hydrazone nitrogen, and the deprotonated oxygen of the hydrazone moiety. The uncoordinated iminooxime groups and the orthogonal orientation of the CH3–C@N–OH groups relative to the adjacent pyridine rings were observed. The ligands and their corresponding Ni(II) complexes exhibited luminescence, with the complexes showing a lower quantum yield compared to the free ligands. The study also includes the X-ray crystal structure of the Ni(II) salicyloylhydrazone complex, which revealed details about the molecular structure and hydrogen bonding interactions in the crystal lattice. The research provides insights into the coordination chemistry of aroyl hydrazone ligands and their potential applications in areas such as pharmaceuticals and materials science.
10.1016/S0957-4166(97)00462-X
The research investigates the asymmetric reduction of various symmetrical diacetylaromatic compounds using baker's yeast (Saccharomyces cerevisiae) to obtain optically active secondary alcohols with high enantiomeric purity. The study explores the reduction of compounds such as 2,6-diacetylpyridine (la), 2,6-diacetylpyridine 1-oxide (lb), 1,2-diacetylb°enzene (lc), 1,3-diacetylbenzene (ld), 1,4-diacetylbenzene (le), 2,5-diacetylfuran (If), 2,5-diacetylthiophene (lg), and 2,5-diacetylpyrrole (lh). The researchers optimized reaction conditions to selectively produce monoalcohols over diols, achieving excellent yields and enantiomeric purities. Key chemicals involved in the research include the diacetylaromatic substrates, baker's yeast, sucrose, and various reagents used in the synthesis and analysis of the compounds, such as methoxymethoxyethyl groups, maleic acid, hydrogen peroxide, oxalyl chloride, dimethyl sulfoxide, and triethylamine. The study highlights the effectiveness of baker's yeast as a biocatalyst for enantioselective reductions under mild conditions, offering a valuable alternative to traditional chemical methods.
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