bluuebunny/crossref_metadata_2025_split huggingface dataset:
Préparation D'Électrodépots Minces D'Actinides A Partir de Solutions Aqueuses D'Acide Éthylénediaminetetraacétique
Authors: Fuger J. 
Published: September 2010

AbstractThe cathodic electrodeposition of several actinide elements from aqueous solutions of EDTA partially neutralized with ammonia is studied. On platinum cathodes, the deposited films are thin, adherent and reasonably uniform. A yield of 90 to 95% can be achieved under suitable conditions.The rate of deposition is the same for tripositive transplutonium elements, but plutonium deposits preferentially at the beginning of the electrolysis; on the other hand, the uranyl ion has a deposition rate lower than the transplutonium elements.The presently described technique is not limited to tracer scale since submicrogram and microgram amounts of various elements can produce satisfactory deposits. For plutonium, deposits up to 300 micrograms/cm2 have been obtained, but with a limiting yield of 70%.
Synthèse de Quelques Dérivés Organostanniques Aromatiques
Authors: Buchman O. , Grosjean M. , Nasielski J. 
Published: September 2010

AbstractSome new aryltrialkyltins Ar‐SnR3 have been synthesized. The compounds having R=CH3 have been made for the Ar groups parabromophenyl, paratolyl, metatolyl, paraanisyl, paratrimethystannyl, paratrimethylsilyl, 1‐naphtyl, 2‐naphtyl and 9‐phenantryl. The compounds where R=n‐butyl have Ar=1‐naphtyl and 2‐naphtyl.
Études Spectroscopiques des Molécules Hydroxylées IV Méthode de détermination de sigma de taft par spectrométrie infrarouge
Authors: Chiurdoglu G. , Masschelein W. , van Haverbeke Y. 
Published: September 2010

AbstractQuantitative association of alcohols and a serie of acceptors: ether, acetone and triethylamine, provides precise correlation between the integrated intensity of the vo‐H absorption band and the sum of the Taft's sigma coefficients of the corresponding alkyls groups of the alcohols.
Effets de Solvant sur la Fréquence de Vibration «Stretching» OH et NH de plusieur alcools et amines
Authors: Denolin‐Dewaersegger L. , van Binst G. 
Published: September 2010

AbstractA discussion of solvent effect upon the streching frequency of Y‐H bonds in correlation with their basicity is reported. The following bonds are studied: O‐H in primary, secondary and tertiary alcohols; N‐H in aliphatic and aromatic amines; and cyclic N‐H where the free electron pair of nitrogen is delocalized in an aromatic π electron system, such as in indole derivatives.The measurements are extended to some indole alcaloïds of known structure.
Mean Amplitudes of Vibration and Thermodynamic Functions of the Dichlorides of Oxygen and Sulphur
Authors: Nagarajan G. 
Published: September 2010

AbstractThe various stages of improvement in the vibrational as well as molecular structure studies for the dichlorides of oxygen and sulphur have been reported. The computed numerical values of (1) mean‐square amplitude quantities, (2) generalized mean‐square amplitudes (mean‐square parallel amplitudes, mean‐square perpendicular amplitudes, and mean cross products) and (3) mean amplitudes of vibration for the temperatures at T=0 and T=298°K have been presented for these two molecules. Further, the molar thermodynamic functions have been calculated by using the fundamental vibrational frequencies with the assumption of a rigid rotator, harmonic oscillator approximation for the temperature range from 50° to 1600°K. Besides these, the computed numerical values of the generalized mean‐square amplitudes have also been reported for the difluorides of oxygen and silicon.
Chromatographie en Couche Mince Des Depsidones Du β Orcinol
Authors: Ramaut J. L. 
Published: September 2010

AbstractAfter showing that the separation of mixtures of depsidones of β orcinol by paper chromatography cannot always be carried out successfully, we investigated this problem in a manner parallel to that of Bachmann in Germany, i.e. by means of a thin layer chromatographic technique.This technique yields very sharp separation of depsidones of β orcinol mixtures with Kieselgel G. (Stahl) as adsorbant, with the solvent phase proposed by Pastuska and adopted by Bachmann (Benzene‐Dioxan‐Glacial acetic acid: 90, 25, 4), U.V. light and paraphenylenediamine as indicators.
Étude du Mécanisme de la Deshalogénation Des vic. Dibromoalcanes Par L'ion Iodure. Dualité de Mécanismes Pour le Processus D'Élimination Directe.
Authors: Mulders J. , Nasielski J. 
Published: September 2010

AbstractThe iodide ion induced elimination of bromine in vic. dibromides in acetone has been followed for some substituted ethanes (k20°; E; log PZ): 1,2‐dibromopropane (6,31. 21,7; 11,0), 2,3‐dibromobutanes (meso: 5,50. 10–6; 17,5; 7,8) (dl: 1,74. 18,3; 7,9), 1,2‐dibromo‐2‐méthylpropane (1,70. 10–6; 22,6; 11,1), 2,3‐dibromo‐2‐methylbutane (1,38. 19,1; 9,4) 2,3‐dibromo‐2,3‐dimethylbutane (6,03. 10–4; 17,3; 9,7), 1,2‐dibromo‐1,2‐diphenylethane méso (1,15. 10–3; 16,0; 9,0).The influence of ionic strength and of added bromide ion allows to distinguish two different mechanisms for the direct elimination.A) for the first members of the series, there is evidence for the existence of an intermediate, whose structure is suggested to be of type A.B) for more substituted ethanes, the results agree nicely with a synchronous transition state B; the rate is a function of the stabilisation of the incipient double bond.
Mise au Point D'Un Dispositif D'Analyse Radiométrique de Haute Sensibilité, Pour Éluats Chromatographiques Gazeux
Authors: Guillaume M. , Warin R. 
Published: September 2010

AbstractThe setting up of a radioactivity measurement device of chromatographic gazeous eluates of minute volumes (maximum injection of 0,4λ) has been realized for weak β energy isotopes (C‐14 and H‐3).The radiochemical detection apparatus is an electrolytic copper ionization chamber.The measure of the current is made by means of a vibrating‐reed electrometer.The electronic stability of the apparatus is satisfactory.The background due to α's is limited to 10‐15 discontinuities an hour.The elution of high boiling point compounds is feasible by heating the ionization chamber and extension device which permits the thermic isolation of the detection chamber.The sensitivity of the whole reaches 1.000 dpm±500 with C‐14 (C*H3OH) and 15.000 dpm with H‐3 (C2H5CH*3).
Kinetical Study of Hydrocarbon‐Nitrous Oxide Flames
Authors: D'Olieslager J. , van Tiggelen A. 
Published: September 2010

AbstractA comparative kinetical study of flames burning in mixtures of nitrous‐oxide and different hydrocarbons has been made. It has been found that the mean molecular weight of the chain carriers changes with the nature of the fuel. A probable reaction mechanism requests the formation of alkoxy radicals which decompose more or less easily according to their structure. Concerning the apparent activation energy derived from burning velocities at different degrees of dilution with nitrogen, no systematic change with the nature of the fuel has been observed.
Étude Cinétique de L'Hydrolyse des Amides X. Hydrolyse acide des Diamides
Authors: Vigneron‐Voortman Mme , Crooy P. , Bruylants A. 
Published: September 2010

AbstractEn milieu acide, l'hydrolyse d'une diamide comprend deux étapes consécutives compétitives: la transformation en acide amique (VI) et l'hydrolyse de celui‐ci en diacide (VII). Le dernier phénomène est complexe. II comprend une réaction apparemment non catalysée et une autre catalysée par l'acide minéral. On a observé, en effet, les deux relations cinétiques suivantes.VI=k[diamide] [H3O+]VII= (k+k[H3O+]) [diamide]A 65° C, les paramètres cinétiques qui ont été déterminés dans ce travail sont les suivants:acide oxamiquek= 1,22 . 10−5s−1; ΔH≠= 16,2 Kcal . m−1; ΔS≠= − 35,3u.e.s.acide malonamiquek= 6,31 . 10−6s−1; ΔH≠= 18,2 Kcal . m−1; ΔS≠= − 30,7u.e.s.maléamidek= 1,1 . 10−41.m−1s−1; ΔH≠= 21,5 Kcal . m−1; ΔS≠= − 15,1u.e.s.acide maléamiquek= 2,4 . 10−3s−1; ΔH≠= 19,6 Kcal . m−1; ΔS≠= −21,2u.e.s.k= 8,5 . 10−41.m−1s−1; ΔH≠= 18,1 Kcal . m−1; ΔS≠= − 21,2u.e.s.fumaramidek= 9,5 . 10−51.m−1s−1; ΔH≠= 16,6 Kcal . m−1; ΔS≠= − 31,8u.e.s.acide fumaramiquek= 0; il n' pas été possible de réaliser l'hydrolyse en l'absence de catalyseur.k= 5,7 . 10−51.m−1s−1; ΔH≠= 12,3 Kcal . m−1; ΔS≠= − 43,7u.e.s.
Étude Théorique de Molécules Conjuguées II. Structure électronique et propriétés énergétiques de trois colorants polyméthiniques
Authors: Leroy G. , Nys J. 
Published: September 2010

AbstractThe electronic structure and some energetic properties of one cyanine and two azacyanines are calculated by the method described in paper I of this series. The results of these calculations are discussed in the light of available experimental data.
N.M.R. Experiments on Ketals III. P.M.R. Spectrum and conformations of the glycolketal of 1,2‐propanediol with acetone and acetaldehyde
Authors: Anteunis M. , Alderweireldt F. 
Published: September 2010

AbstractThe P.M.R. spectra of 2,2,4‐trimethyl‐1,3‐dioxolane and both cis and trans 2,4‐dimethyl‐1,3‐dioxolane are qualitatively analysed. The magnetic anisotropy of a methylgroup causes an upfield shift of the cis‐γ protons of about 0,15 ppm, and an analogous shift of 0,05 ppm for the cis‐γ methyl resonance. This can be used for structure elucidation.In the acetonide and the cis‐compound (III) long range coupling between HA and 4‐CH3 (see II and III) is observed, while in the trans compound (II) it is not.
The Humulinic Acids IV. Humulinic acids C, D.
Authors: Anteunis M. , Bracke M. , Alderweireldt F. , Verzele M. 
Published: September 2010

AbstractHumulinic acids C and D have respectively stucture III and IV. The methyl derivative of HAD(2) has structure V. The assignments are based on physical and chemical evidence. A mechanism for the formation of these substances is advanced.The preparation and isolation of a number of humulinic acid isomers or derivatives called humulinic acids A, B, C, D (HAA, HAB, HAC, HAD) was reported by us before (2). The structure elucidation of humulinic acids A and B showing them to be trans and cis isomers I and II was also reported by our laboratory (1). The recent structure attribution to humulinic acid C by English authors (3) prompts us now to publish our further results.
The isomerization products of humulone
Authors: Alderweireldt F. , Verzele M. , Anteunis M. , Dierckens J. 
Published: September 2010

AbstractThe substance known as “isohumulone” is in fact a mixture of four components. They were separated by C.C.D. According to a new nomenclature based mainly on the chemically related humulinic acids A,B, C etc. series they are the stereoisomers isohumulone A and B (IV and V) and alloisohumulone A and B (VI and VII).
Hydrogenation. II. Mechanism of the catalytic reduction of ketones (and enol derivatives) in alcoholic acid solution
Authors: Acke M. , Anteunis M. 
Published: September 2010

AbstractA mechanism is proposed for the formation of ethers and alkanes by the alcoholic acidic reduction of ketones with Adam's catalyst. An enol precursor for the alcohol formation seems logical, while enol, enolether and a half hydrogenated carbonium ion (HHC) also play a role in the formation of ethers and alkanes, as depicted in chart II.
Effets Électroniques dans les Systèmes Hétérocycliques Aromatiques Spectres de Résonance Magnétique Nucléaire de Pyridazines, Pyrimidines et S‐Triazines Substituées
Authors: Declerck F. , Degroote R. , De Lannoy J. , Nasielski‐Hinkens R. , Nasielski J. 
Published: September 2010

AbstractSubstituted pyridazines, pyrimidines and s‐triazines yield very simple N.M.R. spectra. Substituent effects of electron releasing groups are enhanced in these heterocycles, and surprisingly large shifts occur at the meta positions. The J4–5 in 3,6‐disubstituted pyridazines vary with the electron releasing ability of the substituent located at position 6 and are shown to parallel the bond index P4–5. Nitrogen quadrupole relaxation broadens the signal of 2‐Hydrogen in pyrimidine, whereas the s‐triazine protons yield sharp lines.
Synthèse des Oxo‐2‐Oxathiadiazoles‐L, 2, 3, 5
Authors: Eloy F. , Lenaers R. 
Published: September 2010

AbstractDerivatives of 2‐oxo‐1, 2, 3, 5‐oxathiadiazole, are synthesized by the dipolar addition of sulfinylamines to nitrile oxides. They are also formed by treating a N‐substituted amidoxime with thionyl chloride in pyridine.
Recherches dans la Serie des Benzofurannes. XIV. Spectres Infra‐Rouges D'Alcoyl‐2 Benzofurannes
Authors: Binon F. , Goldenberg C. 
Published: September 2010

AbstractThe infra‐red spectral study of the γ C  H, γ C  C and δ C  H vibrations of 2‐alkyl benzofurans and of certain of the 3‐substituted derivatives of the latter has enabled specific frequencies of these compounds to be determined as well as criteria indicative of a non‐substitution in the 3‐position of the benzofuran.The results obtained furthermore demonstrate the particular character resulting, for the C2 = C3 double bond, from the presence of the oxygen in the furan moiety of the molecule.
Absolute raman intensities of symmetrical stretching modes in some molecules and ions from delta‐function model of chemical binding
Authors: Lippincott E. R. , Nagarajan G. 
Published: September 2010

AbstractA delta‐function potential model is used to derive an analytical expression for the derivative of the mean molecular polarizability with respect to a change in the internuclear distance at the equilibrium configuration for symmetrical stretching modes in the ground electronic states of diatomic and polyatomic systems. The calculated polarizability derivatives are in reasonable agreement with the experimental ones derived from Raman intensities. Bond orders are calculated from experimental polarizability derivatives for various ionic systems and the results are discussed.
Oxydation du Sulfure de 2,2′ Dichlordiéthyle par L'Hypochlorite de Calcium
Authors: Vassart S. , Jadot R. 
Published: September 2010

AbstractThe oxidation of 2,2′‐dichlordiethylsulfide by calcium hypochlorite has been shown to proceed mainly along two ways: the first giving the sulfoxyde and stopping at this stage, the second producing the sulfone which is further transformed into calcium sulfate and carbon dioxyde.
The humulinic acids. V. Specific catalytic reductions methyl allohumulinic acid D.
Authors: Anteunis M. , Bracke M. , Lepoivre A. , Verzele M. , Alderweireldt F. 
Published: September 2010

AbstractMethylallohumulinic acid D (I) was isolated after acid treatment of either humulinic A (HAA) or humulinic acid B (HAB). Some specific reductions on this and other humulinic acids are reported. Dihydromethylhumulinic acid D (IV) is described. A new route to dihydro‐HAB was developed.
Recherches dans la Série des Benzofurannes. XVI. Spectres Infra‐Rouges D'Esters de L'Acide Coumarylique
Authors: Goldenberg C. , Blnon F. 
Published: September 2010

AbstractThe infra‐red spectrum of the coumarilic acid esters showed two absorption peaks in the γ C=O region. By means of various experiments, it was possible to exclude as causes of this duplication of absorption, FERMI's resonance hypotheses and the existence of associations. The phenomenon observed may best be explained on the basis of rotational isomerism. Study of the spectra of both cyclic and acyclic derivatives showed that this rotational isomerism affects the link magnified image whose sequence is in fact present in the esters of coumarilic acid.
Mise au Point D'Une Synthèse du Chlorure D'Ortho Méthylsélénobenzoyle. Étude de son Comportement VIS‐A‐VIS des Dérivés Organocadmiques
Authors: Ruwet A. , Renson M. 
Published: September 2010

AbstractNous étudions la préparation en quantités importantes, des différents stades de la synthèse des ortho méthylsélénoacylophénones. Dans ce but, nous avons mis au point une méthode permettant d'obtenir les chlorures d'acides possédant une fonction sélénoéther arylaliphatique sans destruction de celle‐ci. Nous avons pu préparer ainsi le chlorure d'ortho méthylsélénobenzoyle, qu'on n'avait pas pu obtenir jusqu' à présent. Nous avons montré en outre que, contrairement à l'opinion généralement admise, les dérivés organocadmiques sont susceptibles de réagir sur les cétones les plus courantes, et que cette réaction est même particulièrement aisée avec le diméthylcadmium. Enfin, nous décrivons plusieurs modes d'obtention de l'ortho méthylsélénobenzaldéhyde, encore inconnu.
L'Étude des Décompositions thermiques par Spectrométrie de Masse. II. Nitrite d'éthyle
Authors: Collin J. E. , Delplace A. 
Published: September 2010

AbstractThe thermal decomposition of ethylnitrite, at pressures between 100 and 200 microns, has been investigated in a quartz reactor coupled to a TOF mass spectrometer. A general decomposition scheme is proposed and discussed. It is found that acetaldehyde and ethanol, as well as nitric oxide, are important products of the reaction. No free radicals could be detected with certainty. The activation energy of the decomposition of ethylnitrite, apparently homogeneous, is found to be 37.5 kcal/m, and is consistent with a first order reaction.
Synthèses dans la Série des Acides Pyridine‐Carboxy‐Sulfoniques et Pyridine Disulfoniques
Authors: Delarge J. , Lapiere C. L. 
Published: September 2010

AbstractThe authors have synthetised pyridin‐3‐carboxy‐2‐sulfonic acid (XII), pyridin‐2‐carboxy‐3‐sulfonic acid (IV) and pyridin‐2, 3‐disulfonic acid.The reaction of Meerwein and al. has been applied for the first time in the pyridin series. Several original intermediates are described (X, XIV, XV, XVI, IV).
Méthode Spectrographique de Détection des Méthylènes Actifs et Synthèse de Quelques Dérivés Styriliques, Cyanostilbéniques et Cyanazométhiniques. X. Étude cinétique des Condensations Stilbéniques et Azométhiniques
Authors: Feytmans Medicis M. E. ‐De , Bruylants A. 
Published: September 2010

AbstractCe travail est consacré à la réaction de condensation des nitriles phényl‐acétiques avec lep‐diméthylaminobenzaldéhyde (réaction de Meyer‐Frost) et avec lap‐nitrosodiméthylaniline (réaction d'Ehrlich‐Sachs). L'étude a porté sur le nitrile phénylacétique et ses dérivés cyano‐4, cyano‐3, bromo‐4 et chloro‐4 phénylacétiques. Les deux réactions sont régies par la même cinétique formelle d'ordre trois. Les constantes de vitesse (ks) sont reliées à la nature de substituant (σ) par la relation de Hammett et les constantes de réaction, dans la série stilbénique (MF) et dans la série azométhinique (ES), sont ρMF(30°C) = +1,95 et ρES(30°C) = +3, 29. Le domaine de température exploré a permis la détermination des températures isocinétiques (β); on a trouvé βMF= 416°K et βES= 455° K. Une évaluation de l'acidité des nitriles phénylacétiques a permis de préciser, dans le mécanisme réactionnel, le rôle du carbanion en tant que nucléophile et de caractériser, pour les deux familles de réactions étudiées, les étapes limitatives comme étant des substitutions à nucléophiles variables [SN(PN)v] sur centre insaturé.
Structure De La Di (Fer‐Tricarbonyle)‐Diphénylurée Fe2 (CO)6 (C6 H5 NCONC6 H5)
Authors: Piron Jacques , Piret Paul , Meerssche Maurice Van 
Published: September 2010

AbstractFe2C19N2O7H10, product of the reaction between Fe3(CO)12 and C6H5NCO, crystallizes in the space group P2i/c with four molecules in a unit cell of dimensions a = 8.54, b = 13.25, c = 19.49 Å, β = 106.6°. The crystal structure has been determined by three‐dimensional X‐ray diffraction methods (Weissenberg photographs, symbolic addition procedure, electron‐density maps, least‐squares refinement). The molecule is formed by association between C6H5‐N‐C(O)‐N‐C6H5 and (OC)3 Fe‐Fe(CO)3: each N atom of the first part is linked to the two Fe atoms of the second.
Étude Du Comportement Électrochimique Des Organo‐Magnésiens Dans Les Éthers Anhydres (2e partie)
Authors: Martinot L. 
Published: September 2010

AbstractAfin d'élucider le mécanisme de l'oxydation électrochimique des organomagnésiens, on a appliqué plusieurs méthodes réservées jusqu'ici à la cinétique électrochimique en solution aqueuse.La mesure du facteur de fréquence de la réaction lente ainsi que la détermination de l'ordre de la réaction indiquent que la particule électro‐active est un anion qui réagit selon un processus purement ionique.La réaction cinétiquement déterminante consiste dans le transfert du premier électron de ľentité réactionnelle vers l'anode.
Ethanolysis of Ortho‐, Meta‐, and Parasubstituted Phenylacetyl Chlorides
Authors: Heidbuchel P. W. 
Published: September 2010

AbstractThe ethanolysis of substituted phenylacetyl chlorides was examined at 20°C in a binary solvent mixture of benzene and ethanol. The variation of the rate in the degenerated second order reaction was examined in function of the influence of the substituents. Quite a good Hammett relation was found for the meta‐ and parasubstituted derivatives (p = +0.160), while the ortho‐substituted ones have a low rate and don't follow this relation.
Preparation of Cytidine, Cytidylic Acids and Ribonucleic Acid Specifically Acetylated in the Exocyclic Amino Group of Cytosine
Authors: van Montagu M. , Molemans F. , Stockx J. 
Published: September 2010

AbstractThe synthesis and some properties are described of N(6)‐acetyl cytidine, the corresponding 3′‐, 5′‐, and cyclic 2′,3′‐phosphates and of RNA with N(6)‐acetylated cytosine groups.
Physico‐Chemical Properties of Acid Saponins Molecular Weight, Dissociation Constant, Micellar Aggregation in Solution
Authors: Vochten R. , Joos P. , Ruyssen R. 
Published: September 2010

AbstractHet zuurequivalent van sapoalbine werd potentiometrisch bepaald als 1545. Bij een ionensterkte gelijk aan nul werd potentiometrisch een pKz = 3,52 afgeleid, terwijl de konduktometrische werkwijze voor een sapoalbine koncentratie van 0,080 g/l een pKz = 3,32 opleverde. De onderlinge afwijkingen tussen de konduktometrische resultaten zouden in verband staan met de veranderlijke aggregatietoestand van deze oplossingen. Aan de hand van een aantal technieken (oppervlaktespanning, geleidbaarheid, dissociatiekonstante, de snelheid waarmee het oppervlakte‐evenwicht zich instelt, polarografie, diffusie, solubilisatie van kleurstoffen, differentiaalrefraktometrie en turbidimetrie) werd aangetoond dat oplossingen van sapoalbine vanaf ±0.100g/l (7.10−5 mol/l) micellair zijn. Uit lichtverstrooiingsproeven werd een micelgewicht van 7.142 afgeleid, hetgeen benaderend overeenkomt met een aggregatiegetal van 5. Deze kleine micellen kan men als bolvormig veronderstellen. De straal van het gehydrateerd deeltje, berekend uit viskosimetrische resultaten, bedroeg 14,5 Å terwijl voor de dikte van de watermancel een waarde van 2 Å gevonden werd.
Structure Cristalline Du Chlorure De Lithium Dioxanne‐1,4 Monohydrate: LiCl.C4H8O2. H2O
Authors: Durant F. , Griffé M. 
Published: September 2010

AbstractLiCl. C4H8O2. H2O crystallizes in the monoclinic system, space group P21/c with unit‐cell dimensions a = 5.98, b = 12.85, c = 10.49 Å, β = 113.67°, Z = 4. The structure has been determined from 1290 single‐crystal data by a three‐dimensional X‐ray analysis using heavy atom method, refined by Fourier synthesis and least‐squares method to an R index of 0.157. Each LiN+ is tetrahedrally surrounded by one Cl−, two O (dioxanne) and one O(H2O). The structure consists of infinite chains (Li+.C4H8O2)n and (Cl−. H2O)n parallel to the c crystallographic axis and held together by means of Li+‐O(H2O) and Li+‐Cl− bonds. The principal distances are Li‐Cl : 2.35, Li‐O : 1.90, 1.96, 1.97, O‐H…Cl : 3.15 and 3.19 Å. It is shown that a correlation exists between Li‐O distances and valence angles of the oxygen atoms. Mean distances in dioxanne : C‐O : 1.45, C‐C : 1.46 Å.
Un Disaccharide Nouveau Extrait De La Farine De Manioc II. Synthèses Du 5‐O‐α‐D‐Glucopyranosyl D‐Glucofuranose
Authors: Maghuin‐Rogister G. 
Published: September 2010

AbstractNous avons effectué la synthèse chimique du 5‐O‐α‐D‐glucopyranosyl D‐glucofuranose par deux voies différentes. Le composé synthétique possède les mêmes propriétés que le maniocose. Cet oligosaccharide était le seul disaccharide du D‐glucose non connu à ce jour.