Reactions of coordinated .beta.-polyketonate ligands. 2. Ligand oxidation and benzilic acid type rearrangement in the nickel(II) complex of 2,2-dimethyl-3,5,7-octanetrione. Molecular structure of the binuclear nickel(II) complex of the resultant 2-tert-butyl-2-hydroxy-3,5-dioxohexanoic acid

1985 ◽  
Vol 24 (15) ◽  
pp. 2359-2363 ◽  
Author(s):  
R. L. Lintvedt ◽  
G. Ranger ◽  
C. Ceccarelli
Keyword(s):  
Molecular Structure ◽  
Tert Butyl ◽  
Acid Type ◽  
Benzilic Acid

scholarly journals C18FATTY ACIDS. IV. A REARRANGEMENT OF THE BENZILIC ACID TYPE IN THE ALIPHATIC SERIES

1922 ◽  
Vol 44 (5) ◽  
pp. 1136-1141 ◽  
Author(s):  
Ben H. Nicolet ◽  
Alfred E. Jurist
Keyword(s):  
Acid Type ◽  
Benzilic Acid

Mechanism Study of a Benzilic Acid-Type Rearrangement1

1963 ◽  
Vol 28 (8) ◽  
pp. 2152-2153 ◽  
Author(s):  
Kenneth S. Warren ◽  
O. K. Neville ◽  
Edward C. Hendley
Keyword(s):  
Mechanism Study ◽  
Acid Type ◽  
Benzilic Acid

Synthesis and molecular structure of indium complexes based on 3,6-di-tert-butyl-o-benzoquinone. Looking for indium(i) o-semiquinolate

2011 ◽  
Vol 40 (3) ◽  
pp. 718-725 ◽  
Author(s):  
Alexandr V. Piskunov ◽  
Aryna V. Maleeva ◽  
Georgii K. Fukin ◽  
Evgenii V. Baranov ◽  
Artem S. Bogomyakov ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Indium Complexes ◽  
Tert Butyl

Molecular Structure and Conformations of 2,2-Di-tert-butyl-1,3-diaza-2-silacyclopentane:  Gas Electron Diffraction and Quantum Chemical Calculations

2004 ◽  
Vol 43 (11) ◽  
pp. 3537-3542 ◽  
Author(s):  
Heinz Oberhammer ◽  
Georgiy V. Girichev ◽  
Nina I. Giricheva ◽  
Alexander V. Krasnov ◽  
Uwe Klingebiel
Keyword(s):  
Molecular Structure ◽  
Electron Diffraction ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Gas Electron Diffraction ◽  
Tert Butyl

scholarly journals New Spiro-Tin Compounds: Reaction of N,N′-Dialkyl Sulfur Diimides with Cyclic Bis(amino)stannylenes - Unexpected Formation of a N-N Bond

1995 ◽  
Vol 50 (12) ◽  
pp. 1811-1817 ◽  
Author(s):  
Max Herberhold ◽  
Christian Köhler ◽  
Wolfgang Milius ◽  
Bernd Wrackmeyer
Keyword(s):  
Molecular Structure ◽  
Magnetic Resonance ◽  
Single Crystal ◽  
Structure Analysis ◽  
Membered Ring ◽  
Monoclinic Space Group ◽  
Unexpected Formation ◽  
Tin Compounds ◽  
X Ray ◽  
Tert Butyl

N,N′-Dialkyl sulfur diimides (1), R(NSN)R [R = Me (a), Et (b), nPr (c), nBu (d)] react with cyclic bis(amino)stannylenes such as 1,3-di-tert-butyl-4,4-dimethyl-1,3,4,2λ2-diazasilastannetedine (2) or 1,3-di-tert-butyl-4,4,5,5-tetramethyl-1,3,4,5,2λ2-diazadisilastannolidine (3) in a 2:1 ratio to give the new spiro-tin(IV) compounds 5a-d, 6b and 6c, built from the respective cyclic bis(amino)stannylene and a seven-membered ring in which the two sulfur diimide groups are coupled via a N-N bond and across the tin atom. A 1:1 adduct 4 is proposed as an intermediate which is the final product 4e in the case of R = tBu (1e). The products were characterized by multinuclear magnetic resonance (1H, 13C, 15N, 29Si, 119Sn NMR), and in the case of 5c the molecular structure was determined by single crystal X-ray structure analysis [monoclinic, space group C2/c ; a = 1504.1(3), b = 1393.3(3), c = 1688.6(3) pm; β = 115.71(3)°].

scholarly journals Formation of carboxylic acids during degradation of monosaccharides

2008 ◽  
Vol 26 (No. 2) ◽  
pp. 113-131 ◽  
Author(s):  
O. Novotný ◽  
K. Cejpek ◽  
J. Velíšek
Keyword(s):  
Free Radicals ◽  
Aqueous Solutions ◽  
Carboxylic Acids ◽  
Sodium Hydroxide Solution ◽  
Model Systems ◽  
Alkaline Solutions ◽  
Hydroxycarboxylic Acids ◽  
Acid Type ◽  
Cannizzaro Reaction ◽  
Benzilic Acid

The formation of low molecular carboxylic and hydroxycarboxylic acids as well as sugar and deoxysugar acids from monosaccharides (D-glucose, D-fructose, D-arabinose, DL-glyceraldehyde, and 1,3-dihydroxyacetone) was studied in three different model systems: aqueous and alkaline solutions of potassium peroxodisulfate (K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>), and sodium hydroxide solution. In total, 3 low molecular carboxylic acids (formic, acetic and propionic), 24 hydroxycarboxylic acids, and 12 corresponding lactones were identified and quantified by GC/MS. Formic, acetic, and propionic acids were isolated by extraction with diethyl ether and directly analysed by GC/MS; hydroxycarboxylic acids and their lactones were monitored as their trimethylsilylated derivatives using the same method. Formic, acetic, L-lactic, glycollic, DL-2,4-dihydroxybutanoic acids and aldonic acids derived from the parent sugars were the most abundant compounds in all model systems. Within the models investigated, the yield of carboxylic acids and hydroxycarboxylic acids (together with their lactones) ranged between 9.3–22.2% (n/n) and between 3.6–116.9% (n/n), respectively. The amount of acids was significantly lower in aqueous solutions of K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> than in the alkaline solutions. The data obtained indicate that lower carboxylic acids are formed by both subsequent reactions (oxidation and/or intramolecular Cannizzaro reaction) of the sugar fragmentation products and direct decomposition of some intermediates such as uloses or hydroperoxides derived from the parent sugars. The acids possessing the original sugar skeleton are formed as a result of sugar oxidation or benzilic acid type rearrangement of deoxyuloses. Lower acids may also be formed by a recombination of free radicals.

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