Structure and NMR spectra of bicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylic acid and its Anhydride

Infrared spectroscopy and multinuclear (13C, 17O, and 119Sn NMR spectroscopy have been used to study the structure of bis(1-butyl)tin(IV) carboxylates of dicarboxylic acids (1-C4H9)2. Sn(X(COO)2), where X = (CH2)n (n = 0-8), CH=CH (cis and trans) and C6H4 (ortho and para).The crystalline compounds are formed by linear or cyclic oligomers or polymers whose basic building units represent a grouping composed of the central tin atom substituted by two 1-butyl groups and coordinated with both oxygen atoms of two anisobidentate carboxylic groups derived from different molecules of a dicarboxylic acid. The environment of the tin atom has a shape of a trapezoidal bipyramid. When dissolvet in non-coordinating solvents, the compounds retain the oligomeric character with unchanged structure of environment of the central tin atom. In the media of coordinating solvents the bis(1-butyl)tin(IV) carboxylates of dicarboxylic acids form complexes whose central hexacoordinated tin atom binds two molecules of the solvent trough their donor atoms. Carboxylic groups form monodenate linkages in these complexes.

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Kernresonanzspektroskopische Untersuchungen an Hexafluordiazabiphenylen und 2.3.6-Trifluorpyridin-4.5-dicarbonsäurederivaten / NMR Spectroscopic Investigations on Hexafluorodiazabiphenylene and Derivatives of 2,3,6-Trifluoropyridine-4,5-dicarboxylic Acid

Zeitschrift für Naturforschung B ◽

10.1515/znb-1973-11-1212 ◽

1973 ◽

Vol 28 (11-12) ◽

pp. 758-762 ◽

Cited By ~ 2

Author(s):

Gerhard Hagele ◽

Peter Sartori ◽

Alfred Golloch

Keyword(s):

Fourier Transform ◽

Dicarboxylic Acid ◽

Nmr Spectra ◽

Molecular Symmetry ◽

Fluorine Nmr ◽

Spectroscopic Investigations ◽

Nuclear Overhauser ◽

Derivatives Of

Two isomers of hexafluorodiazabiphenylene were obtained via the pyrolysis of 2,3,6-trifluoropyridine-4,5-dicarboxylic acid disilver salt. Their [AMX]2 fluorine NMR spectra were recorded in Fourier transform technique, partially analyzed and correlated with the molecular symmetry of the isomers. Relative signs of nJFF in 2.3,6-trifluoropyridine-4,5-dicarboxylic acid were determined by nuclear Overhauser experiments.

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Borkomplexe mit Dicarbonsäuren: Bis(oxalato)borate und Bis(malonato)borate/Boron Complexes with Dicarboxylic Acids: Bis(oxalato)borates and Bis(malonato)borates

Zeitschrift für Naturforschung B ◽

10.1515/znb-1982-0813 ◽

1982 ◽

Vol 37 (8) ◽

pp. 1020-1025 ◽

Cited By ~ 13

Author(s):

Eberhard Bessler ◽

Johann Weidlein

Keyword(s):

Boric Acid ◽

Dicarboxylic Acid ◽

Vibrational Spectra ◽

Nmr Spectra ◽

Heterogeneous Reaction ◽

Dicarboxylic Acids ◽

Continuous Separation ◽

Boron Complexes

Abstract Several bis(oxalato)borates and bis(malonato)borates have been prepared in heterogeneous reaction from boric acid, dicarboxylic acid and dicarboxylic salt by refluxing in benzene under continuous separation of water. The compounds were characterized by their IR and 11B NMR spectra. The vibrational spectra of the bis(oxalato)borate are discussed in detail.

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