bluuebunny/crossref_metadata_2025_split huggingface dataset:
Constituents of Peppers. Part VI. The Oxygenated Fraction of Pepper Essential Oil
Authors: Debrauwere J. , Verzele M. 
Published: September 2010

AbstractThe oxygen containing part of the essential oil of black pepper was resolved into twenty‐five fractions by preparative gas chromatography. Separation of the major compounds of these fractions was carried out by preparative open tubular column gas chromatography. The compounds were characterized by infrared, nuclear magnetic resonance, mass and ultraviolet spectroscopic studies. Trace constituents were investigated by combined gas chromatography‐mass spectrometry. Thirty‐three compounds were identified, of which only six have been reported previously as occurring in black pepper oil. Nine compounds have to our knowledge never been found in natural products.
Effect of Minor Components on the Surface Tension of Micellar Dodecyl Sulfate Solutions
Authors: Joos P. , Deelstra H. 
Published: September 2010

AbstractA theory is developed to predict the effect of a minor component on the surface tension variation of micellar surfactant solutions. The approach is similar as this of Lucassen‐Reynders and van den Tempel. The theory was tested for sodium dodecylsulfate solutions containing higher alcohols (hexadecanol, octanol, decanol, dodecanol and tetradecanol). Fair agreement between theory and experiments was achieved except for octanol and hexanol.
Synthesis of the First Optically Active Tetraorganotin Compound in Which the Tin Atom Is The Only Chiral Center
Authors: Gielen M. , Mokhtar‐Jamai H. 
Published: September 2010

AbstractThe synthesis of optically active p‐anisyl‐(3‐hydroxy‐3‐methylbutyl)methyl‐α‐naphthyl tin (IV) is described. The spectroscopic properties of this compound and of the products used as synthesis intermediates are given. The two diastereoisomers of (‐)‐menthyl‐β‐(methylnaphthyl‐phenylstannyl)‐propionate (V) could not be separated.
Cyclopentanones. XII. An Alternative Synthesis of Prostaglandins Involving Catalytic Hydrogenation of 2, 3‐Dialkyl‐4‐Dihydroxy‐2‐Cyclopentenones
Authors: Coen R. , De Clercq P. , van Haver D. , Vandewalle M. 
Published: September 2010

AbstractA novel approach to Corey's aldehyde is described. A suitable substituted all cis 2, 3‐dialkyl‐l, 4‐cyclopentanediol system is obtained by catalytic reduction of 2, 3‐dialkyl‐4‐hydroxy‐2‐cyclopentenones. Epimerisation to the prostaglandin configuration occurs spontaneously when later on the Horner reaction is carried out.
The Conformational Equilibrium in CIS‐2‐Methoxy‐CIS‐Decalane
Authors: Tavernier D. , De Pessemier F. , Anteunis M. 
Published: September 2010

AbstractThe chair‐chair equilibrium in cis‐2‐methoxy‐cis‐decalane has been studied by 1H‐NMR spectroscopy; the conformer featuring the equatorial methoxyl is the more stable one; ΔG°198 = 1.2 ± 0.1 and ΔG°291 = 1.4 ± 0.2 kcal.mole−1.
Conformational Preferences of Alkyl Substituents in 5‐Me‐5‐R‐1, 2, 3‐Trithianes
Authors: Goor G. , Anteunis M. 
Published: September 2010

AbstractVariable temperature 1H‐NMR‐study of 5‐Me‐5‐R‐1,2,3‐trithianes shows an axial preference for linear and α‐branched groups; this preference is disfavoured by β‐substitution. The Ph‐group takes exclusively the equatorial position.
Alkylation of Some Potential 2‐Oxoesters
Authors: Kolind‐Andersen H. , Dyrnesli R. , Lawesson S.‐O. 
Published: September 2010

AbstractOn reaction with R‐Hal, salts of ethyl phenylcyanopyruvate, dialkyl oxalacetate and their derivatives undergo 0‐alkylation in almost all cases. Also mono‐ and disubstitutions on carbon are observed. The structure of the product from alkylation of the sodium salt of diethyl oxalacetate with diethyl chlorooxalacetate has been determined. The effect of solvent as well as the influence of the structure of the alkylating agent and the substrate on the 0/c‐ratio of substitution are discussed.
Nucleophilic Substitution of Brominated Isophorone Compounds Via Zwitterionic Intermediates
Authors: Verhé R. , Schamp N. , De Buyck L. , Vanloocke R. 
Published: September 2010

AbstractThe reaction of brominated isophorone compounds with sodium methoxide in methanol has been investigated and mechanisms for these reactions are discussed. 4‐Bromoisophorone gave exclusively 2‐methoxyisophorone, while 2,4,6‐tribromo‐ and 2,4,6,6‐tetrabromo‐3‐bromomethyl‐2‐cyclohexenone afforded 2,4‐cyclohexadienone compounds.However, the reaction of 2,4,6‐ and 2,6,6‐tribromo‐3‐dibromomethyl‐5,5‐dimethyl‐2‐cyclohexenone took a total different way with formation of resp. a bicyclo compound and Favorskii rearrangement products.These results were rationalized in terms of zwitterionic species instead of the classical nucleophilic substitution.
A 300 MHz Study of Melibiose, Lactose and 3‐Keto‐Lactose in D2O
Authors: De Bruyn A. , Anteunis M. , van Beeumen J. , Verhegge G. 
Published: September 2010

AbstractThe 300 MHz 1H‐n.m.r. spectra of β‐D‐allose (1), α‐D‐galactopyranosyl‐(1 → 6)‐D‐glucopyranose (melibiose) (2), β‐D‐galactopyranosyl‐(l → 4)‐D‐glucopyranose (lactose) (3) and O‐β‐D‐xylo‐hexopyranosyl‐3‐ulose‐(1 → 4)‐D‐glucopyranose (3‐keto‐lactose) (4) are discussed. From comparative considerations of shift increments caused by several substitutions (e.g. downfield shift of 0.1‐0.2 p.p.m. of an axial proton by the presence of a synaxial and a vicinal axial OH, but an absence of any effect on the equatorial proton) it is corroborated that 3‐keto‐lactose occurs in the hydrated form in D2O.
Laplace Transformation Trial Basis Functions for the1Σ Ground State of Two‐Electron Diatomic Molecules
Authors: Leclerc Jean‐Claude 
Published: September 2010

AbstractThe one‐dimensional Laplace transform of the exponential exp(‐rx) was used to generate functions which could be useful as basis sets for molecular calculations. In a particular case, they reduce to the Hulthén approximation. These 2‐ to 4‐ parameter orbitals were applied to the calculation of the ground state energy of H2, He2++, Li24+ and Be26+, using CI definition for the wave function.
Comportement Polarographique et Solvatation de Quelques Lanthanides Dans le Melange Binaire Dimethylsulfoxyde ‐ Carbonate de Propylene
Authors: Massaux J. , Duyckaerts G. 
Published: September 2010

AbstractNous avons étudié le comportement polarographique des trois ions Eu3+, Yb3+, Sm3+ dans lea solvants binaires DMSO‐CP. Lee vagues polarographiques sont toutes contrǒlées par la diffusion et dans tous les cas le passage du CP au DMSO est énergiquement favorable. L'application aux vagues irréversibles des méthodes de HALE et PARSONS ou de BOND nous a permis d'accéder aux constantes de dissociation et à la stoechiométrie des complexes de Eu3+, Eu2+, Yb3+ et Yb2+ avec la DMSO dans le CP.La connaissance de ces constantes d'équilibre nous a permis de déduire les variations d'enthalpie libre associées au passage de ces ions du CP à toutes les compositions du solvant binaire; les valeurs obtenues concordent de façon satisfaisante avec celles obtenues par polarographie sur la base de l'hypothèse de STREHLOW de l'invariance du potentiel normal du couple cobaltocène‐ion cobalticinium.
Extraction par Solvant a l'aide de la Thiothenoyltripluoroacetone et de β‐Dicetones Fluorees en Vue du Dosage de Traces Metalliques Dans les Eaux par Spectrophotometrie d'Absorption Atomique
Authors: Jauniaux M. , De Meyer M. , Lejeune W. , Levert J. M. 
Published: September 2010

AbstractL'article décrit un procédé de dosage de plusieurs éléments métalliques: aluminium, cadmium, cuivre, fer, plomb et zinc à l'état de traces dans les eaux. Les éléments sont extraits sous forme de chélates métalliques de β‐dicétones fluorées (trifluoroacétyl‐acétone, thénoyltrifluoroacétone) ou de la thiothénoyltrifluoroacétone au moyen de propionate d'éthyle. Ils sont ensuite dosés par spectrophotométrie d'absorption atomique de l'extrait organique. Les courbes d' étalonnage sont linéaires de 0 à 100 μg/l au moins; les sensibilités varient du ppb à la dizaine de ppb selon les métaux. Le procédé peut être étendu à de nombreux autres éléments.
Reactivity of α,α‐Dihalogenated Imino Compounds. Part IX Rearrangement of N‐2‐ (1, 1‐Dichloroalkylidene) Anilines with Lithium Aluminium Hydride
Authors: De Kimpe Norbert , Verhé Roland , Schamp Niceas 
Published: September 2010

AbstractThe lithium aluminium hydride reduction of N‐2‐(1,1‐dichloroalkylidene)‐anilines 3 afforded mainly the rearranged secondary amines 4 next to the normally expected secondary amines 5. The formation of the rearranged secondary amines 4 is explained by an aziridine intermediate. The highly branched derivative 3d gave the aziridine 6d in good yield, besides the secondary amine 5d.
Structure de Bases de Schiff Derivees de 4‐Acylpyrazoline‐5‐Ones et 5‐Thiones
Authors: Maquestiau A. , van Haverbeke Y. , Vanovervelt J. C. 
Published: September 2010

AbstractThe structure of 21 1‐phenyl‐3‐R‐4,1′‐alkyl (aryl)aminoalkyl(aryl)idenepyrazolin‐5‐ones or 5‐thiones is examined.Whereas the chelated NH exo Z form exists always in the pyrazolin‐5‐thiones compounds, this type of tautomer is only observed, for the pyrazolinones derivatives, when one or two steric interactions between substituents (R3‐R1′, and/or R1′‐R2′,) occur.
Chemical Studies of Marine Invertebrates ‐ XIII 2 ‐ Hydroxynephtenol, a Novel Cembrane Diterpene from the Soft Coral Litophyton Viridis (Coelenterata, Octocorallia, Alcyonacea)
Authors: Tursch B. , Braekman J. C. , Daloze D. 
Published: September 2010

AbstractThe soft coral Litophyton viridis contains the already known nephtenol and a novel cembrane diterpene whose structure has been established as 2‐hydroxynephtenol. The absolute configuration of (‐)‐nephtenol has been demonstrated.
O‐Alkyl‐O‐Aryl‐Phenylphosphonothioates
Authors: Steurbaut W. , De Kimpe N. , Schreyen L. , Dejonckheere W. 
Published: September 2010

AbstractA series of 27 O‐alkyl‐O‐aryl‐phenylphosphonothioates was prepared and studied by I. R.‐ and N. M. R.‐spectroscopy. The I. R.‐spectra gave typical vibrations: P‐O‐alkyl, P‐Carom and P‐O‐Carom. Shifts in stretching frequencies were related with electronic properties of the substituents.
1H‐N. M. R Study of Some D‐Aldohexapyranosyl‐D‐Fructos(id)es in D2O
Authors: De Bruyn Andrè , van Beeumen J. , Anteunis M. , Verhegge G. 
Published: September 2010

AbstractWe report on the analysis of the 300 MHz 1H‐n.m.r spectra obtained in D2O of SUCROSE (α‐D‐glucopyranosyl‐(1 → 2)‐β‐D‐fructofuranoside), PALATINOSE (α‐D‐glucopyranosyl‐(1 → 6)‐D‐fructose), LEUCROSE (α‐D‐glucopyranosyl‐(1 → 5)‐D‐fructose), TURANOSE (α‐D‐glucopyranosyl‐(1 → 3)‐D‐fructose) and LACTULOSE (β‐D‐galactopyranosyl‐(1 → 4)‐D‐fructose). It was possible to identify most of the resonances of the major isomers using the homo‐INDOR technique. The extracted chemical shifts are compared with those of the corresponding mono‐oses and increment rules are suggested.
Shift Increment Studies in L‐Arabinopyranoses and β‐D‐Fructopyranose
Authors: De Bruyn A. , Anteunis M. 
Published: September 2010

AbstractWe report on the complete analysis of the 1H‐n.m.r. spectrum at 300 MHz of α‐, and β‐L‐arabinopyranose in D2O. Increment rules as derived previously for aldohexapyranoses and 2‐deoxy‐aldopyranoses are extended to aldopentapyranoses and β‐D‐ketohexapyranoses.
U. V. and I. R. Spectroscopic Studies of 4‐Aryl‐3,5‐Diethoxy‐Carbonyl‐2,6‐Dimethyl‐1, 4‐Dihydropyridines (Hantzsch Esters)
Authors: Dommisse R. A. , Lepoivre J. A. , Alderweireldt F. C. 
Published: September 2010

AbstractThe U.V. and I.R. spectral data of 4‐aryl‐3,5‐diethoxycarbonyl‐2,6‐dimethyl‐1,4‐dihydropyridines with different aryl substituents are discussed. The λmax values of the long‐wavelength absorption band in the U.V. spectra show a similar solvent dependence for all the compounds. (The results indicate a more polar state of the chromophore in the excited state). The variations induced by different 4‐aryl substituents are correlated with the electronic effects of these substituents. The I.R. stretching vibrations of the bonds in the chromophoric system are not influenced by the 4‐R‐substituents.
A Comparative Study of the Radiolysis of 1‐Chloropropane at 77 K and 300 K
Authors: De Jonge D. , Ceulemans J. 
Published: September 2010

AbstractA study was made of the radiolysis of 1‐chloropropane at 77 K and 300 K. The observed differences between the yields, extrapolated to zero absorbed dose, at these temperatures may be explained by cage and temperature effects on the different radical reactions.
On the Dipole Moments of some Hydrogen‐Bonded Complexes and the Second Electron Affinity of Phenols
Authors: van Hooydonk G. 
Published: September 2010

AbstractA formula expressing bond dipole moments of donor‐acceptor bonds is derived from the ionic bonding approximation. Only the characteristics ionization energy and electron affinity are thereby used and reasonable agreement is obtained with recently reported experimental data. A rough estimate can be obtained for the second electron affinity of neutral species, defined as the enthalpy of the reaction A− + e → A–.
Structure Electronique de l'oxepine, de l'azepine, de l'oxyde et de l'aziridine de benzene
Authors: Colot G. , Krief A. , André J‐M. 
Published: September 2010

AbstractNon‐empirical calcutations of the electronic structure of azepine, oxepine, benzene oxide and benzene aziridine are presented. Calculations are found to be in good agreement with available experimental data on relative stabilities and intuitive repartition of electronic charges in the above molecules.
Optically Active Transition Metal Complexes, XXXIV (+)579‐ and (‐)579‐(‐C5H5)Mo(CO) (NO)[P(C6H5)2N(CH3)CH(CH3)(C6H5)]
Authors: Brunner H. , Doppelberger J. 
Published: September 2010

AbstractIn the reaction of C5H5Mo(CO)2NO +) with (+)579 n‐(C6H5)2PN(CH3)CH(CH3) (C6H5), abbreviated with PØ2R*, the pair of diastereoisomers (+)579‐ and (‐)579‐ C5H5Mo (CO) (NO)PØ2R* (+)I and (‐)I is formed. The two diastereoisomers can be separated by preparative liquid chromatography; the less soluble isomer can also be obtained optically pure by several fractional crystallisations. The asymmetric induction of the group R* on the substitution of the enantiotopic CO ligands is only small; the two diastereoisomeric complexes (+)I and (‐)I are obtained in nearly equimolar amounts. The compounds are configurationally stable in solution even in the presence of nucleophiles like triphenylphosphine and isonitriles.The amino phosphine ligand in C5H5Mo(CO) (NO)PØ2R* can be transformed into the methoxy phosphine ligand P(C6H5)2OCH3 by reaction with HCl followed by addition of CH3OH.
Recherche dans la Serie Des 1, 2, 4‐Triazoles. Micropréparation et étude physico‐chimique du 3‐nitro‐1, 2, 4‐triazole
Authors: Closset J‐L. , Copin A. , Drèze Ph. , Alderweireldt F. , Durant F. , Evrard G. , Michel A. 
Published: September 2010

AbstractA method is described for isolating and purifying microquantities of 3‐nitro‐1, 2, 4‐triazole obtained by reaction of nitrous acid with 3‐amino‐1, 2, 4‐triazole (A.T.A.) a well known herbicide.The physico‐chemical properties of that compound are studied by N. M. R., mass, infrared spectrometries and R. X diffraction.The reaction is discussed in terms of the caracterised formed product.
Zinn ‐ Chalkogen ‐ Heterocyclen. I. 2.4.6‐Hexamethyl‐1.3.5‐triselena‐2.4.6‐tristannacyclohexan, Massen‐ und Schwingungsspektren
Authors: Mathiasch B. , Blecher A. 
Published: September 2010

AbstractThe mass spectrum of the title compound exhibits very similar fragmentation patterns compared with the sulfur analogon. The high stability of triply coordinated organotin cations is remarkable. There is no evidence for any stabilisation effects by pπ‐dπ bonding concerning the ring bonds.The assignment of the vibration spectra leads to the conclusion that the molecule of triselenastanninane possesses a boat conformation.
Structure de Paires d'ions du Sodium dans les Solvants Oxygènes
Authors: Detellier Christian , Laszlo Pierre 
Published: September 2010

AbstractAu moyen de la rmn du sodium‐23, on étudie la séparation par les glymes des paires d'ions formées par l'iodure de sodium. Le degré d'agrégation de la paire d'ions serrée présente dans le THF correspond principalement à une dimérisation. L'alcool tétrahydro furfurylique est au moins aussi efficace que le triglyme pour séparer les paires d'ions.
Contribution a L'Étude des Sulfures Mixtes ZnSCo1‐xS, ZnSFe1‐x et ZnSMnS
Authors: Blaton Norbert , Glibert Jacques 
Published: September 2010

AbstractA distribution curve for the systems ZnSCo1‐xS, ZnSFe1‐x and ZnSMnS is established by precipitation at 25°C and pH 5 with a deficient quantity of Na2S in mixed ZnSO4CoSO4, ZnSO4FeSO4, and ZnSO4MnSO4. solutions. The distribution reaction between the solid and liquid phase leads to the formation of mixed sulphides. The saturation limits for the different solid solutions can be derived from the slope changes in the respective distribution curves.
Etude de L'Equilibre Azido → Tetrazole Dans la Serie du Thiazolo [2,3‐e] Tetrazole I. Effets de Solvant
Authors: Elguero J. , Faure R. , Galy J. P. , Vincent E. J. 
Published: September 2010

AbstractThe influence of solvent on the azido‐tetrazole equilibrium in thiazole series has been investigated by means of proton NMR spectroscopy. We made a hypothesis about the structure of the cation of azidothiazoles and we proposed that there is a rough parallelism between azido‐tetrazole isomerism and prototropic tautomerism.
Benzo‐ and indoloquinolizine derivatives ‐ VII The dehydrogenation of enamines in the synthesis of benzo[c]substituted quinolizidines
Authors: van Binst G. , Baert R. , Biesemans M. , Mortelmans C. , Salsmans R. 
Published: September 2010

AbstractDuring the synthesis of benzo[c]quinolizidine derivatives, the dehydrogenation of enamines with palladium on charcoal in the presence of a hydrogen acceptor has been studied. The reaction conditions are rather drastic. The best results are obtained when the enamine is stabilised by conjugation with a keto‐group.
Approche theorique du problème de la tautomérie des triades HX‐Y=Z⇆X=Y‐ZH. I. Équilibre Amine‐Imine (Y=CH, Z=NH)
Authors: Teysseyre J. , Arriau J. , Dargelos A. , Elguero J. , Katritzky A. R. 
Published: September 2010

AbstractThe imino→amino tautomerism of four classes of related compounds, enamines, amidines, amides and thioamides, has been examined by means of the CNDO/2 method with complete geometry optimization. The calculated energy differences between the two tautomers agrees with the experiment in the case of oxygen and nitrogen derivatives, but in the case of thioamides the real situation lies between the sp and spd approximation. To understand the origin of the differences between the equilibrium constants an analysis of the bicentric partition of the total energy has been done.
A New substituent constant E(R) derived from carbonyl intensities of simple R′R″CO molecules — II Chloroform
Authors: Seth‐Paul W. A. , van Hoeyland P. 
Published: September 2010

AbstractThe carbonyl intensities E (l.Mole−1 cm−2) of simple R′R″CO molecules measured in dilute chloroform solutions can be estimated by means of the relation: E=ϵ(R') · ϵ(R″) where ϵ(R') and ϵ(R″) are factors dependent upon the nature of the R′ and R″ substituents. The contribution of each substituent to the carbonyl frequency or intensity change on passing from carbon tetrachloride to chloroform solutions can be determined Combinations of the following substituents: OH, OMe, Me, Et, nPr, iPr, CH2Ph, (CH2)2Cl, CHCl2 and CCl3 which form stable compounds are expected to have log10 E values which correlate with ΣEs, Σσ1, ΣσoR(R) and ΣX(R) in carbon tetrachloride, and with ΣσoR(R) and ΣX(R) in chloroform solutions.
The Kerr constants of 4‐and 5‐phenyl‐1,3‐dioxanes and the conformations of their phenyl groups
Authors: Kataev V. E. , Vul'fson S. G. , Vereshchagin A. N. , Anteunis Marc , Tavernier Dirk , Hosten Noël 
Published: September 2010

AbstractThe molar Kerr constants and the dipole moments of r‐2‐cis‐5‐dimethyl‐trans‐5‐ø‐1,3‐dioxane (1), r;‐2‐trans‐5‐dimethyl‐cis‐5‐ø‐1,3‐dioxane (2), 2‐methyl‐5,5‐di‐ø‐1,3‐dioxane (3), cis‐2‐methyl‐4‐ø‐1,3‐dioxane (4)‐2‐cis‐6‐dimethyl‐cis‐4‐ø‐1,3‐dioxane (5), r‐2‐cis‐6‐dimethyl‐trans‐4‐ø‐1,3‐dioxane (6) have been obtained in CCl4 at 20°C. The molecular anisotropy of 3, evaluated from the light‐scattered measurements, has also been obtained. The rotation angles of the phenyl groups with respect to the Csp2‐C‐H plane or the Csp2‐C‐CH3 plane have been determined by the comparison of the observed molar Kerr constants with those calculated for various conformations; these values emerge as (2): 60°; (3): ø‐eq. 70°, ø‐ax. 15° or ø‐eq.80°, ø‐ax.−10°; (4) and (5): 25°; (6): 60° (turning towards the oxygen atom of the dioxane cycle).
Hydrogen bond propensity of a thyroid hormone model
Authors: Herwats Luc , Laszlo Pierre , Wiertz Jean 
Published: September 2010

AbstractDespite steric hindrance by the bulky iodines, the terminal OH group of thyroxine appears to be a good hydrogen‐bond donor as found from a study of the proton chemical shifts of 2, 6‐di‐iodohydroquinone in acetone and dimethyl sulfoxide.
Thermal cyclisation of an alleneamidine to a dihydropyridine derivative involving a 1,5‐hydrogen shift
Authors: Fuks R. , Merenyi R. , Viehe H. G. 
Published: September 2010

AbstractThe alleneamidins 1 has been shown to cyclise to a dihydropyridine derivative 2 by heating for a 2 hours at 220°. This reaction is assumed to proceed via a (1, 5 a)‐sigmatropic hydrogen shift followed by a 6 π‐electrocyclisation. An attempt has been made to extend this new heterocyclisation.
The stereochemistry of the tetrahydropyranes formed by reacting 4‐methyl‐4‐penten‐2‐ol with acetaldehyde. Evidence for a hemiacetal intermediate
Authors: Tavernier Dirk , Anteunis Marc , Hosten Noël 
Published: September 2010

Abstract4‐Methyl‐4‐penten‐2‐ol reacts in acidic medium with acetaldehyde to give a mixture of r‐2, cis‐4‐, cis‐6‐, & r‐2, trans‐4, cis‐6‐trimethyl‐4‐tetrahydropyranol (2) and r‐2, cis‐4‐, cis‐6‐, & r‐2, trans‐4, cis‐6‐trimethyl‐4‐(4′‐methylidene‐2′‐pentoxy)‐tetrahydropyrane (3). The third possible isomer, the trans‐2, 6‐dimethyl derivative, could not be detected. This stereochemical outcome strongly suggests a hemiacetal intermediate. The dehydration products of 2, cis‐2,6‐dimethyl‐4‐methylidene‐tetrahydropyrane (5) trans‐and cis‐2, 4, 6‐trimethyl‐5, 6‐dihydro‐2, pyrane (6 and 7) are reported. A half‐chair form for 6 follows from its 1H‐nmr spectrum.
Evaluation par spectromètrie infrarouge des grandeurs thermodynamiques d'association de quelques phosphates, phosphoramides et phosphoramidates propargyliques en solution dans le tetrachlorure de carbone
Authors: Paugam Jean‐Paul , Lauransan Jacques 
Published: September 2010

AbstractLes constantes thermodynamiques de la complexation de phosphates, de phosphoramidates
et de phosphoramides propargyliques ont été déterminées par spectrométrie infrarouge, d'une part avec le p‐chlorophénol (PCP), d'autre part avec le diméthylsulfoxyde (DMSO).
Nous situons ainsi ces composés comme de très bons accepteurs de proton (380 < K < 4000 1.mole−1) tandis qu'ils ne sont que faiblement donneurs (K < 1 l.mole−1). Dans des cas particuliers, les enthalpies de complexation avec le DMSO et le PCP ont été évaluées ainsi que la constante d'autoassociation.
Contribution à l'étude theorique de la liaison hydrogène II. Les dimères de l'acide sulfhydrique
Authors: Leroy G. , Louterman‐Leloup G. , Ruelle P. 
Published: September 2010

AbstractL'étude ab initio des dimères de l'acide fluorhydrique est le troisième exemple illustrant notre approche théorique de la liaison hydrogène. Les résultats obtenus confirment les précédents: la structure linéaire est la plus stable; la chaleur de formation de ce complexe vaut‐5.766 kcal m−1; la distance d'équilibre correspondante (1.627 Å) est inférieure à la somme des rayons de Van der Waals du fluor et de l'hydrogène; le transfert de charge est important; le lien hydrogène se forme dans l'axe d'un des centroïdes localisé sur l'atome de fluor ou encore dans le creux de potentiel électrostatique créé par la molécule qui reçoit l'hydrogène.