Tritium-labeled compounds. X. Isotope effects in the oxidation of aldoses-1-t with bromine
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منابع مشابه
Tritium-Labeled Compounds IX. Determination of Isotope Effects in Reactions Yielding Water-f from Nonvolatile Reactants. Oxidation of Aldoses-1-t With Iodine
A convenient method is presented for est imating isotope effects in reactions which yield water-J. T h e water-2 is separated by freeze-drying, and k*/k is calculated from the extent of t he reaction and the rat io of the radioactivi ty of the water-Z to t h a t of the initial reac tant . Application of the method to the oxidation of aldoses-l-£ a t 25 °C with iodine in alkaline solution gives ...
متن کاملTritium - Labeled Compounds III . Aldoses - i - ( , 2
In a n c,," method fo r prepar ing aldoses labeled wit h Lritium at ca r bon l , Lhc aldoni c lactone l S rcdu ced with li thium boro.hyddde-I in p yridine soluLion . The mcthod is suitablc for prcparing aldosesl -1 h a vin g high specifi c act ivit ies. Thc crudc product con tains a substant ia l proport ion of t hc c<?lTespondin g a ldi tol-l-I, but t he purc aldosc-l-1 is rcadil y scparated ...
متن کاملTritium-Labeled Compounds IX. Determination of Isotope Effects in Reactions Yielding Water-t from Nonvolatile Reactants. Oxidation of Aldoses-l-t With Iodine
A convenient m ethod is presented for estimating isotope effects in reactions which yield waterto The water-t is separated by freez e!=h~yjng, and k*/k is calculated froJ? .t!J.e extent of the reaction and the ratio of the radioactIvIty of t he water-t to that of the lnItlal reactant. Application of the method to the oxidation of aJdoses-1-t at 25°C with iodine in a lkaline solution gives value...
متن کاملOxidation of Aldoses With Bromine
Rates of oxidation of aldoses with bromine have bee n reappraised and inte rpreted in th e light of present concepts of conformation and reaction mechanism. It is suggested that differences in t he rates of ox idation of the a and /3 anomers are largely determin ed by differences in the free energy req uired by the reactants for passing from the ground state to the com plex in the transition st...
متن کاملTritium - Labeled Compounds VII . Oxidation of D - Fructoses 1 D - Mannitols - C 14 Isotope Effects in the and D - Mannitols - t to
n -Ma nni tols, la beled eit her wi t h carbo n-14 at Cl , C2, or C3, o r wi t h tri t ium a t tached to Cl , C2, or C3, were prepared . After oxidatio n by Acetobacter suboxydans, t he dist ribu tion of r adioactivity in each of t he r esul t ing labeled n-fructoses wa deter mined . La beled nmanni tol is uni que a mong t he hexito ls in t ha t i t may be ox idi zed by A . suboxydans in eit he...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
سال: 1964
ISSN: 0022-4332
DOI: 10.6028/jres.068a.013