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Zhu J, Geris AJ, Wu G. Solid-state 17O NMR as a sensitive probe of keto and gem-diol forms of α-keto acid derivatives. Phys Chem Chem Phys 2009; 11:6972-80. [DOI: 10.1039/b906438a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Kliegel W, Pokriefke JO, Rettig SJ, Trotter J. Diphenylboron complexes of the enol tautomers of arylpyruvic acids. Crystal and molecular structure of triethylammonium (2-nitrophenyl)pyruvato-diphenylboron(1-). CAN J CHEM 2000. [DOI: 10.1139/v00-052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Synthesis has been carried out of 15 examples of anionic diphenylboron complexes of arylpyruvic acids, and the structures of the compounds have been determined from spectroscopic data and from X-ray analysis of one of the compounds. Crystals of5j are monoclinic, P21/n,a = 9.5566(10), b = 15.961(3), c = 16.6382(6) Å, beta = 99.3239(10)°, and Z = 4, at 180 K. The structure was solved by direct methods and refined by full-matrix least-squares procedures to R(F2) = 0.056 for 6662 CCD data. 5j contains a triethylammonium cation and an anion containing a planar five-membered OBOCC ring, with cation and anion linked by an N-H···O hydrogen bond. Spectroscopic data and bond distances establish that the pyruvate ligand is the enol-tautomeric state.
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