Structures of boron chelates of mono- and diacylketene aminals

1996 ◽  
Vol 45 (10) ◽  
pp. 2411-2416
Author(s):  
V. A. Dorokhov ◽  
L. G. Vorontsova ◽  
M. G. Kurella
Keyword(s):  
Boron Chelates

Boron Chelates and Boron-Metal Chelates, X [1]. 3-(2-Hydroxyphenyl)-2,2-diphenyl-1-oxa-3-azonia-2-borata-naphthalene-methanol (1/1): Synthesis, Spectroscopic Investigations and Crystal Structure

1982 ◽  
Vol 37 (11) ◽  
pp. 1450-1455 ◽  
Author(s):  
Rudolf Allmann ◽  
Eberhard Hohaus ◽  
Stanislaw Olejnik
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Structure Analysis ◽  
Title Compound ◽  
Chelate Ring ◽  
Boron Chelates ◽  
X Ray ◽  
Membered Chelate Ring ◽  
Compound C ◽  
Overall Ratio

The title compound, C25H20BNO2 · CH3OH, was examined by UV, IR, 1H, and 13C NMK spectroscopy as well as by thermogravimetry and X-ray structure analysis (Pbnb, a = 8.815, b = 17.309, c=28.992 Å, R= 5.5%). These investigations show the six-membered chelate ring (chelate A) to exist as formulated in [2] and not as a five-membered chelate ring B. One methanol molecule connects two chelate molecules by hydrogen bonds, resulting in an overall ratio of chelate to methanol of 1 : 1.

Dipole moments of boron chelates with tropolone and 1,3-diketone derivatives

Tetrahedron ◽  
1977 ◽  
Vol 33 (24) ◽  
pp. 3261-3264 ◽  
Author(s):  
A.T. Balaban ◽  
Ioana Bally ◽  
V.I. Minkin ◽  
A.I. Usachev
Keyword(s):  
Dipole Moments ◽  
Boron Chelates

Massenspektrometrische Untersuchungen an Borchelaten, V [1] Fragmentierung borhaltiger aromatischer Azoverbindungen / Mass Spectrometric Investigation of Boron Chelates, V [1]Fragmentation of Aromatic Azo Compounds Containing Boron

1980 ◽  
Vol 35 (3) ◽  
pp. 316-318 ◽  
Author(s):  
Eberhard Hohaus ◽  
Wolfgang Riepe ◽  
Klaus Wessendorf
Keyword(s):  
Chelate Ring ◽  
Mass Spectrometric ◽  
Azo Compounds ◽  
Spectrometric Investigation ◽  
Mass Spectrometric Investigation ◽  
Boron Chelates ◽  
Molecular Ion ◽  
Significant Change ◽  
Structural Formulae ◽  
Aromatic Azo Compounds

Differing fragmentation of boron chelates of aromatic azo compounds confirms the structural formulae 1a-7c, presented in [2].More significant differences are caused by the substituent of the boron R (F instead of C6H5).Although certain rules can be deduced by the substitution of F for CeHs with regard to the change in intensity of the ions M+, M+-R (and others), in some cases the stable aromatic azo system causes a significant change in the fragmentation as compared with that of azomethine chelates. The chelates 7 eliminate “RH” and show no molecular ion. Apparently a second chelate ring is closed before further fragmentation can start. Fragmentation of 7 a and b is analogous to 5.

Energy barriers for the enantiotopomerization of tetrahedral boron chelates

1982 ◽  
pp. 169 ◽  
Author(s):  
Michail S. Korobov ◽  
Leonid E. Nivorozhkin ◽  
Leonid E. Konstantinovsky ◽  
Vladimir I. Minkin
Keyword(s):  
Energy Barriers ◽  
Boron Chelates ◽  
Tetrahedral Boron

Borchelate mit Hydroxamsäuren: Bis(hydroximato)borate / Boron Chelates with Hydroxamic Acids: Bis(hydroximato)borates

1993 ◽  
Vol 48 (9) ◽  
pp. 1275-1278 ◽  
Author(s):  
Eberhard Bessler ◽  
Victor M. Deflon ◽  
Johann Weidlein
Keyword(s):  
Boric Acid ◽  
Elemental Analysis ◽  
Hydroxamic Acid ◽  
Nmr Spectra ◽  
Hydroxamic Acids ◽  
Potassium Bicarbonate ◽  
Boron Chelates

Potassium and triethylammonium salts of bis(acetohydroximato)borate and bis(benzohydroximato)borate have been prepared by reaction of boric acid with the corresponding hydroxamic acid and potassium bicarbonate or triethylamine, respectively. The compounds have been characterized by elemental analysis, IR, Raman and NMR spectra (1H and 11B).

Massenspektrometrische Untersuchungen an Borchelaten der Pyridin- und Chinolin-Reihe und deren N-Oxiden / Mass Spectrometric Investigations on Boron Chelates of the Pyridine and Quinoline Type and their N-Oxides

1973 ◽  
Vol 28 (7-8) ◽  
pp. 440-445 ◽  
Author(s):  
Eberhard Hohaus ◽  
Wolfgang Riepe
Keyword(s):  
Carboxylic Acid ◽  
Mass Spectra ◽  
Membered Ring ◽  
Mass Spectrometric ◽  
Ring Closure ◽  
Boron Chelates ◽  
Boron Chelate

Mass spectra of chelate-6-rings (N-oxide-chelates) are similar to those of comparable chelate-5-rings after elimination of oxygen from the fragment ion (M-C6H5). It is assumed that the fragment ion [(M-C6H5)-O] exists as a five-membered ring.However, there are two exceptions which are: The diphenyl boron chelate of pyridine-2-carboxylic acid anilide N-oxide with O-B-O-coordination and the difluorine boron chelate of 8-hydroxyquinoline N-oxide. The stable fragment OBX (X = C6H5F) is eliminated directly from the fragment ion (M-X). It is assumed the ring closure in [(M-X)-O] obviously is less favoured. The preparation of both 5-ring-chelates using the components is impossible, too.

scholarly journals Fluorescence of boron chelates of ο-hydroxycarbonyl compounds

1963 ◽  
Vol 12 (4) ◽  
pp. 385-389 ◽  
Author(s):  
Toshio SHIBAZAKI
Keyword(s):  
Boron Chelates
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