La chitosamine libre

Bruyn, C. A. Lobry de; Ekenstein, W. Alberda van

doi:10.1002/recl.18990180302

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…In the epimerization -glucose Ǟ ǟ -mannose, a NiCl 2 / TMEDA ratio of 1:2 has been used and the complex Ni 2 (T-MEDA) 4 Cl 2 has been postulated as the catalytic species. [23] In order to prove that the same complex is active in the rearrangement of α-hydroxy ketones, the isomerization of 1 was carried out with catalysts differing in the NiCl 2 / TMEDA ratio ( Figure 2).…”

Section: Scheme 3 Formation Ofmentioning

confidence: 99%

“…[1,2,3] In vitro, de Bruyn and van Ekenstein observed the first α-ketol rearrangement in the base-catalyzed isomerization of aldoses at the end of the 19th century. [4,5] The first step of this reaction was the formation of an enediol, because in D 2 O solution the C2-hydrogen atom was replaced by deuterium. [6,7] Favorski investigated the acid-…”

Section: Introductionmentioning

confidence: 99%

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Metal-Catalyzed Enantioselective α-Ketol Rearrangements

Brunner

Stöhr

2000

Eur. J. Org. Chem.

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Keywords: Rearrangements / Isomerizations / Ketones / Asymmetric catalysisPromoted by catalytic amounts of transition-metal complexes, the tertiary α-hydroxy ketones 1, 3, 5/6 undergo αketol rearrangements to afford equilibrium mixtures of isomers with a reorganization of the carbon skeleton. The range of metal complexes catalyzing the isomerizations is large; the best results were obtained with the catalyst systems NiCl 2 / TMEDA, Ni(acac) 2 , and Ni(acac) 2 /TMEDA (TMEDA = N,N,NЈ,. The catalytic rearrangements were performed at 130°C in the absence of solvent, with a Ni II /ligand/substrate ratio of 1:2:100. The equilibrium composition of the model system 1/2 is 12.5:87:5.

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Section: Scheme 3 Formation Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal-Catalyzed Enantioselective α-Ketol Rearrangements

Brunner

Stöhr

2000

Eur. J. Org. Chem.

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“…Chemical conversion of glucose to fructose can be also performed under alkaline conditions and at a temperature higher than that typically used (55-60°C) for the enzymatic process. Transformations in an alkaline environment following the so-called Lobry de Bruyn-Alberda-van Ekenstein rearrangement [5][6][7] are nonspecific leading to formation of side products. Conversion is typically limited resulting in fructose concentration of 40%.…”

Section: Introductionmentioning

confidence: 99%

Aldose to ketose interconversion: galactose and arabinose isomerization over heterogeneous catalysts

Murzin

Murzina

Aho

et al. 2017

Catal. Sci. Technol.

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Isomerization of glucose, galactose and arabinose to corresponding keto-sugars was studied in the present work over a range of heterogeneous catalysts. Magnesium aluminates with different ratios between oxides resulting in materials with a Mg/Al ratio from 0.2 to 0.9 were prepared, characterized and evaluated in terms of their catalytic behavior. The catalyst with a Mg/Al ratio close to hydrotalcites was the most efficient considering activity, selectivity and stability. The sugar structure was shown to have a minor influence on catalytic activity and selectivity.

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“…OR 50 years sugar chemists have been puzzled by the true F chemical nature of glutose postulated in 1897 by de Bruyn and van Ekenstein (6). They claimed that the unfermentable reducing substance in molasses and that which they obtained from fructose or glucose by treatment with weak alkali, or by heating fructose in aqueous solution, ar8 identical.…”

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confidence: 99%

Chemical Nature of Glutose

Clark¹,

Kao²,

Sattler³

et al. 1949

Ind. Eng. Chem.

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curve ifi the result of an average of three identical samples of LITERATURE CITED each OF the preservatives represented.Other evaporation or permanency studies are being made and from these, curves will be plotted to show not only the permanency of the oils but also the permanency of toxicity of the oils.It is believed that such a study will be even more important in revealing the true value of a hydrocarbon wood prescrving oil in its relation to the protection of wood over the expected life of the treated product.Snell and Shipley (9) pointed out the difference between permanency and permanency of toxicity, and further showed some of the relations between these factors and tho distillation pattern and specific gravity of the whole oil. CONCLUSION.Is a result of studies to date, it would appear that new source, of wood-preserving oils may be developed and specifications may bo drawn for all hydrocarbon-wood-preserving oils from whatever source they may be derivrd.(1) Baechler, It.

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La chitosamine libre

Cited by 14 publications

References 7 publications

Metal-Catalyzed Enantioselective α-Ketol Rearrangements

Metal-Catalyzed Enantioselective α-Ketol Rearrangements

Aldose to ketose interconversion: galactose and arabinose isomerization over heterogeneous catalysts

Chemical Nature of Glutose

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