bluuebunny/crossref_metadata_2025_split huggingface dataset:
Anomalous Reaction Course in the Amidoalkylation With 4‐Substituted 2‐Methoxy N‐Trifluoroacetyl Piperidines
Authors: Callens R. E. A. , Duquet D. , Borremans F. A. M. , Anteunis M. J. O. 
Published: September 2010

AbstractAmidoalkylation of suitably substituted benzo[b] furans and benzo[b] thiophenes with 2‐methoxy‐N‐acyl‐piperidines and morpholines gave very low yields of the 2‐(2'‐benzo[b] furanyl)‐, and 2‐(2'‐benzo[b] thienyl) piperidine derivatives. The amidoalkylation of 3‐phenyl‐benzo[b] furan with the isomeric mixture of the 4‐methyl‐2‐methoxy‐N‐trifluoroacetyl piperidines however gave a good conversion but trans‐4‐methyl‐2‐(2'‐(3'‐phenyl) benzo[b] furanyl)‐N‐trifluoroacetyl piperidine is only the minor product formed. Mass spectroscopy, H and 13C NMR spectroscopy proved that the major product is l‐trifluoroacetylamino‐3‐methyl‐5, 5‐bis (2'‐(3'‐phenyl)‐benzo[b] furanyl)‐pentane.
Anodic Methoxylation of Heterocyclic Compounds. Part II. Anodic Methoxylation of 4‐Methyl‐And 4‐T. Butyl‐N‐Trifluoroacetylpiperidine
Authors: Duquet D. , Callens R. E. A. , Borremans F. A. M. , Anteunis M. J. O. 
Published: September 2010

AbstractAnodic methoxylation of 4‐methyl‐and 4‐t.butyl‐N‐trifluoroacetyl‐piperidine results in a 4:1 mixture of the trans‐and cis‐2‐methoxy derivatives. The isomeric 4‐methyl derivatives can be separated on a preparative scale by gas chromatography, while the 4‐t.butyl derivatives were purified by reversed phase chromatography on a (heptafluorodecyl) dimethylsilyl bonded phase.
2‐Pyrilideniminobenzohydroxamic Acid as Analytical Reagent for the Spectrophotometric Determination of Vanadium(V)
Authors: Salinas F. , Jiménez‐Arrabal M. , Durán I. 
Published: September 2010

AbstractThe synthesis and analytical properties of 2‐pyrilideniminobenzohydroxamic acid (2‐PIBHA) as well as its reactivity with inorganic ions are described.The reaction between 2‐PIBHA and vanadium(V) was studied and two new methods for the determination of vanadium(V) are proposed: one in methanol‐water medium (40:60%, V:V) and the other one using an extraction in isoamyl alcohol. Fundamental characteristics of the first one are: λ=487 nm, β=3518 1.mol−1.cm−1application range: 3 to 8 ppm of V(V), Sandell sensitivity (1): 1.4×10−2 μg V(V) cm−2 and for the other one: λ=485 nm, π=5080 1.mol−1.cm−1, application range: 0.6 to 1.6 ppm of V(V) and Sandell sensitivity: 1.02×102 μg V(V) cm−2 (refered to the aqueous phase).Both methods were applied with sucess to the determination of vanadium(V) in steel.
Application of Linear Free Energy Relationships (LFER) in the Aromatic Hydroxylation of Anisoles by Chromic Acid in Acetic Acid‐Water Mixtures
Authors: Musala Reddy P. , Jagannadham V. , Sethuram B. , Navaneeth Rao T. 
Published: September 2010

AbstractKinetics and mechanism of aromatic hydroxylation of anisoles by chromic acid has been investigated in 50° aqueous acetic acid. The reaction followed second order kinetics, first order each in [substrate] and [oxidant] at constant [H+] and ionic strength. The effect of meta and para substituents on the reaction rates has been studied. The application of LFER to the rates reveals that the site of attack is at the ortho carbon atom but not at the oxygen atom.
[2+2] Cycloaddition Reactions of Isothiazoles Intramolecular Nucleophilic Attack On Isothiazolium Salts Preparation of New β‐Lactam Systems Based on Isothiazole Nucleus
Authors: Hassan Mohamed E. 
Published: September 2010

Abstract[2+2] cycloaddition reactions of isothiazoles with diphenyl ketene afford new fused β‐lactam systems. The intramolecular nucleophilic attack of carbanions on isothiazolium salts is found to take place on the ring sulphur atom. 2‐H‐2‐benzoyl‐1, 3‐thiazines were prepared and allowed to react with diphenyl ketene, or with acid chloride in the presence of a tertiary amine, to afford the corresponding β‐lactams.
Molecular Complexes of Cyclophanes. Part V π‐π Molecular Complexes of Multibridged Cyclophanes With Tetracyanoethylene and 2‐Dicyanomethylene Indane‐1,3‐Dione
Authors: Mourad Aboul‐Fetouh E. , Eltamany El‐Sayed H. 
Published: September 2010

AbstractThe intermolecular charge‐transfer absorption spectra of tris‐, tetra‐ and penta‐bridged cyclophanes as β‐donors with tetracyanoethylene as well as 2‐dicyanomethylene indane‐1,3‐dione as β‐acceptors have been measured in methylene chloride at 22°C. Evidence of the strain and molecular structure of the β‐donors studied is to be seen from the values of λmax of the longest wavelength charge‐transfer (CT) band as well as the equilibrium constant of formation. All molecular complexes with tetracyanoethylene have been isolated and their constitution, melting points and infrared spectra are described. The tetra‐bridged cyclophane has proved to be the strongest β‐base of all β‐donors examined. Stoichiometry, equilibrium constant of formation and molar extinction coefficients of the molecular complexes under investigation have been determined.
Helicenes: Synthèse Photochimique Et Étude Rmn 19F, 13C et 1H De Fluoro‐1‐Hexahelicenes Et Fluoro‐1‐Heptahelicenes
Authors: Gorsane M. , Defay N. , Martin R. H. 
Published: September 2010

Abstract1‐Fluorohexahelicene, 1‐fluoroheptahelicene and 12 substituted derivatives of these fluorohelicenes have been synthesized by the photocyclodehydrogenation of 1‐fluoro‐11‐styrylbenzo[c]phenanthrenes (Table 2) and 1‐fluoro‐13‐styrylpentahelicenes (Table 4) respectively. The photocyclisations to heptahelicenes were accompanied in five cases, by a side reaction, namely a protodefluoration. A new synthesis of heptahelicene is described (25±18: 40%). 1H, 19F and 13C‐NMR spectra are discussed. 19F and 13C‐NMR spectra of 1‐fluoro‐, 1‐fluoro‐13‐methyl‐ and 1‐fluoro‐13‐methoxycarbonylpentahelicene (8d, 8a and 8 R=‐CO2CH3) are also included.
Concentration Gradients of Some Minor Components In Human Tooth Enamel
Authors: Verbeeck R. M. H. , Driessens F. C. M. , Borggreven J. M. P. M. , Wöltgens J. H. M. 
Published: September 2010

AbstractRods with a cross section of 3 mm2 were prepared from the labial surface of premolars extracted either 0.5, 1.5 or 3.5 years after eruption. Enamel slices with a thickness of 100 μm were cut from these rods at a distance of 100 μm apart from each other. The infrared spectra of these slices showed that the carbonate and HPO42− content of enamel increase with depth, whereas the A‐type CO32− and OH− content decrease with depth. A possible involvement of these minor components in posteruptive maturation could not be detected.
Metal‐Solvent Interactions of Iron and Naphthalocyanines With Thionyl Chloride: An Xps Approach
Authors: Riga Joseph , Savy Michel , Verbist Jacques J. 
Published: September 2010

AbstractX‐ray photoelectron spectroscopic investigations have been performed on phthalocyanine and naphthalocyanine samples previously exposed to thionyl chloride or dissolved into thionyl chloride solutions. With Fe and Mo compounds, fast oxidation of the central metal has been observed, and the data illustrate the dissociative character of the SOCl2 chemisorption.
Synthesis of Succinoylated Inulin and Application as Carrier For Procainamide
Authors: Vermeersch Joan , Schacht Etienne 
Published: September 2010

AbstractInulin was succinoylated by reaction with succinic anhydride using 4‐dimethylaminopyridine as acylation catalyst. The corresponding polyacid was activated by treatment with 1,1′‐carbonyldiimidazol and subsequently coupled with the N‐glycyl derivative of procainamide.
Normal Coordinate Analysis of Orthonitrate Anion NO
Authors: Hase Y. 
Published: September 2010

AbstractNormal coordinate treatment was carried out for the orthonitrate anion NO43− to investigate the vibrational force field and the normal modes of internal vibration. Based on the differences between the observed and calculated fundamental wavenumbers, the internal tension k (NO43−) was found to be almost 0.25 mdyn. Å and for this value of k (NO43−) the Urey‐Bradley force constants adjusted by the least squares calculations were obtained to be K (N‐O)=1.743, H(ONO)=0.574, and F(O…O)=1.261 mdyn/Å
Oxydation D'Alcènes Cycliques Par L'Iodylbenzène Catalysée Par L'Acetylacétonate De Vanadyle
Authors: Barret R. , Pautet F. , Daudon M. , Mathian B. 
Published: September 2010

AbstractIodylbenzene with vanadyl acetylacetonate oxidizes cyclic alkenes, the experimental results accord with a free radical oxidation mechanism.
Synthese Und Eigenschaften Geminaler Bisphosphazide Und Bisphosphinimine Kristall‐Und Molekülstruktur Von (δ)‐3‐Amino‐2‐Cyan‐7‐(Diphenylphosphinoyl)‐5,5‐Diphenyl‐4‐Aza‐5λ5‐Phospha‐2,4‐Heptadiensaure‐Methylester
Authors: Saalfrank R. W. , Ackermann E. , Fischer M. , Weiß B. , Carrié R. , Danion D. , Peters K. , Von Schnering H. G. 
Published: September 2010

AbstractReaction of methyl 3,3‐diazido‐z‐cyanacrylate (7) with triphenylphosphane leads to a geminal bisphosphazide 11 and bisphosphinimine 12 respectively.The structure of methyl (E)‐3‐amino‐z‐cyan‐7‐(diphenylphosphinoyl)‐5,5‐diphenyl‐4‐aza‐5λ5‐phoepha‐2,4‐heptadienate (16) was established by X‐ray analysis.
Infrared Spectrum (3000–500 cm−1) OF 2,4,5‐Trichloro‐6‐[(Diethylamino)Methyl] Phenol Oh and Od in the Solid State
Authors: Rospenk M. , Zeegers‐Huyskens TH. 
Published: September 2010

AbstractThe infrared spectra of 2,4,5‐trichloro‐6‐[(diethylamino)methyl]phenol and its deuterated analogue have been studied in the solid state. The bands observed in the vOH(OD) region are ascribed to a Fermi resonance interaction involving the 2OH(OD), 2OH(OD) +yOH(OD) and 2yOH levels.
Étude De La Réactivité De Composés Enaminocarbonyles Vis‐à‐Vis De L'Isocyanate Et De L'Isothiocyanate De Phényle
Authors: Maquestiau A. , Vanden Eynde J.‐J. , Monclus M. 
Published: September 2010

AbstractReactions between 4‐amino‐3‐penten‐2‐one, ethyl 3‐amino‐2‐butenoate or 3‐amino‐2‐butenanilide and phenyl isocyanate yield mixtures of N‐ and C‐adducts. Quantitative data allow to check the influence of the electronwithdrawing groups in the enaminocarbonyl precursors and of the solvent polarity on the course of these reactions.Starting from the same derivatives and phenyl isothiocyanate, only C‐adducts are isolated.Ethyl 2‐methyl‐3‐amino‐2‐butenoate adds phenyl isocyanate or isothiocyanate on the nitrogen atom of the amino group while ethyl 3‐methylamino‐2‐butenoate adds the same electrophiles on the C(2) atom.
Cristallisation D'Une Variété Triclinique De Yb(PO3)3
Authors: Rzaigui M. , Kbir Ariguib N. 
Published: September 2010

AbstractA new crystal form of Vb(PO3)3 has been prepared, Its absorption IR and main crystallographic characteristics have been determined. This polyphosphate variety crystallizes with a triclinic cell: a=8.361(3), b=7.508(1), c=6.237(5)Å α=86.02(3)*, β=103.35(6)*, γ=90.92(1)*, V=380 Å3, Z= 2 and a space group Pl or Pl.
Homolytic Substitution in Trialkyltin Iodides by Photochemically Generated Iodine Atoms. III. Mechanism and thermodynamics
Authors: De Ryck P. H. , Verdonck L. , Van Kelen G. P. Der 
Published: September 2010

AbstractA detailed reaction mechanism for the homolytic substitution of trialkyltin iodides by iodine atoms is presented.The thermodynamic parameters, ΔH, ΔS and ΔG are calculated for the different reaction steps.
Study of Bis [N, N1‐Dicyclopropyldithiooxamidato (‐1)‐S,S'] Palladium(II) by X Ray Diffraction, UV‐VIS and IR Spectroscopy
Authors: Hofmans H. , Desseyn H. O. , Lenstra A. T. H. 
Published: September 2010

AbstractPd C16 H22 N4S4, Mr=505.0, monoclinic, P/c, Z=4, a=14.880(8), b=8.100(5), c=17.876(6) Å, B=110.50(4)Å at 150 K, V=2018(3)Å3, Dx=1.66 Mg m−3, λ(MoK)=0.7107 Å, μ=1.306 mm−1, crystal size 0.1×0.1×0.2 cm., F(000)=1024, Rw=0.10 for 2178 reflections with I>2σ(I) out of 3568 independent measurements.The structure contains two crystallographically independent Pd atoms situated at inversion centers. Each Pd is surrounded by four S atoms in a square‐planar coordination. The distribution of bond lengths in the organic ligands suggests ionized thiolimid forms with extensive‐electron delocalization over the entire carbon‐nitrogen skeleton.The UV‐Vis spectrum of the PdL2 (L=C3H5NCSCSNHC3H5) is compared with the spectra of related complexes and the absorption bands are assigned. An IR vibrational analysis is given for the complex in the solid state and in solution.
Méthylation En Phase Gazeuse De Quelques Fonctions Organiques Par L'Ion Diméthyliodonium
Authors: Jortay C. , Flammang R. , Maquestiau A. 
Published: September 2010

AbstractElectron impact ionization of iodomethane at high pressure (∼ 1 torr) yields high concentrations of dimethyliodonium ions (CH3CH3). Their reactivity towards various functional groups has been studied by mass spectrometry techniques, including in some instances collisional activation. Most of the compounds studied show the methylation process, except aliphatic alcohols and some aromatic compounds like benzene, anisole, furan, thiophene. Nitriles and isonitriles present a very high methyl cation affinity. Other ionization processes have also been observed, e.a. protonation, charge exchange and hydride abstraction. The degree of competition between these processes depends on the nature of the functional groups. Some unusual ion structures have been detected for isonitriles and pyridines.
Synthèses Asymétriques et Synthèses Asymétriques Potentielles D'α‐Amino Alcools: Hydroxyamination D'Oléfines par la Méthode de Sharpless
Authors: Hassine B. Ben , Gorsane M. , Pecher J. , Martin R. H. 
Published: September 2010

AbstractOptically active α‐amino alcohols have been synthesized by Sharpless method with (‐)‐10,11‐dihydroquinine 2 and (R) ‐ (‐)‐pantolactone 8 as chiral inducers.Five secondary (dl)alcohols: 3,4,5,6,7 and (dl) 2‐hydroxyheptahelicene 1 have also been used to prepare the intermediate diastereomeric (dl)α‐hydroxy carbamates 9. The highest inductions were obtained with (‐)‐10,11‐dihydroquinine and (E)‐stilbene (e.e. ≥98%) and with (dl)2‐hydroxyheptahelicene and (E)‐stilbene (d.e. ≥98%).
Étude du Polymorphisme et de L'Intersolubilité de Triglycerides Palmito‐Oleiques par Diffraction RX de Poudres et Analyse Calorimétrique Différentielle
Authors: Gibon V. , Durant F. 
Published: September 2010

AbstractThe study of the polymorphism and the intersolubility of some palmitic p and oleic O triglycerides: PPP, OPP and POO, has been performed using differential scanning calorimetry and powder X‐ray diffraction.Binary and ternary phase diagrams have been constructed by differential scanning calorimetry; the different polymorphic forms have been verified by variable temperature X‐ray powder diffraction. Each system has been studied by two ways: after melting and quenching, and after tempering a few months at room temperature. The construction of those phase diagrams shows the formation of solid solutions, monotectic interactions …, according to the nature and the polymorphic form of the triclycerides.
Mechanism of Ester Aminolysis in Aprotic Media and Specific Solvent Effects
Authors: Nagy Otto B. , Reuliaux Victor , Bertrand Nicole , van Der Mensbrugghe Anne , Leseul Jean , Nagy Janos B. 
Published: September 2010

AbstractThe n‐butylaminolysis of nitro‐substituted 4′‐nitrophenyl benzoates and cinnamates as well as of phenylacetates in aprotic solvents is governed by a kinetic law implying higher order terms in nucleophile. It is shown that the attacking nucleophile forms a n‐π type molecular complex with the substrate before reaching the transition state in the subsequent kinetic step. This molecular complex is a true reaction intermediate as evidenced by the observed negative activation enthalpy. Other nucleophile molecules intervene as general base catalysts. Tertiary amines also catalyse the reaction. Their catalytic activity is linearly related to their hydrogen bond forming ability and it is not a direct function of their proton basicity. By varying the nucleophile structure, an excellent Brönsted relationship could be obtained for the first time in aprotic media, the ß of which confirms that the catalytic collapse of tetrahedral intermediate is the rate determining step. The reaction of cinnamates turns out to be less sensitive to structural changes of the substrate than is the reaction of benzoates as shown by the corresponding Hammet σ values. The electronic effects of 2‐nitro groups are strongly solvent dependent. Once more, it is established that whenever specific solvent effects (π‐donor or n‐donor ability) are present, they dominate the overall effect. A general reaction mechanism is proposed which not only explains the various roles played by the nucleophile but also accounts successfully for the great variety of kinetic schemes observed in aprotic media.
X‐Ray Photoelectron Spectroscopy of Sulfur Containing Ni/SiO2 Catalysts
Authors: Montes M. , Genet M. , Hodnett B. K. , Stone W. E. , Delmon B. 
Published: September 2010

AbstractAttempts were made to regenerate two Ni/SiO2 catalysts which were exposed to sulfur‐containing compounds. Attempted regeneration was by oxidation followed by reduction. The amount of sulfur present after these treatments was followed by chemical analysis and X‐ray photoelectron spectroscopy. Oxidation and reduction was successful in removing a large part of the sulfur but catalytic activity for benzene hydrogenation could not be restored. The XPS data indicate that the small amounts of sulfur which remained after treatment in hydrogen were located largely in the bulk rather than at the surface of the nickel particles.
Synthesis of a Protected Acetylene Dipeptide Isostere
Authors: van Marsenille M. , Gysen C. , Tourwé D. , van Binst G. 
Published: September 2010

AbstractA racemic dipeptide analogue of Leu‐Gly in which the peptide bond is replaced by a carbon‐carbon triple bond has been prepared. Key steps are the use of a Mitsunobu reaction to introduce a phtaloyl‐protected aminogroup and subsequent Jones oxidation of a primary alcohol to the carboxylic acid.
Dihydronaphtalène Carbolactone‐1,8: Aromatisation en Présence D'Isocyanate de Phényle
Authors: Bouaziz Z. , Laharotte C. , Rougny A. , Fillion H. 
Published: September 2010

AbstractThe aromatization of conjugated dihydronaphtalene carbolactone‐1,8 with Pd‐C and phenylisocyanate is described; the reaction is accelerated in presence of this hydrogen acceptor.
Étude de la Réaction Entre la 5‐Amino‐2,4‐Dihydro‐4‐|(Phénylamino) Méthylène|‐2‐Phényl‐3H‐Pyrazole‐3‐One et Le 3‐Oxobutanoate D'Éthyle
Authors: Maquestiau A. , Vanden Eynde J.‐J. 
Published: September 2010

AbstractReaction between the title compounds, when carried out in refluxing chlorobenzene, leads to a mixture of three products: ethyl 2,3‐dihydro‐3‐oxo‐1H‐pyrazolo |3,4‐b|pyridine‐5‐carboxylate and two isomeric pyrazolo |1,5‐a| pyrimidinediones.Possible reaction pathways are proposed and dependance of several experimental parameters on the distribution of the final products is discussed.
Homolytic Substitution in Trialkyltin Iodides by Photochemically Generated Iodine Atoms. IV. Evaluation of Solvent Effects on the Electron Donor Acceptor Complexes and the Reactivity of Alkylmetals
Authors: De Ryck P. H. , Hoste S. , van Der Kelen G. P. 
Published: September 2010

AbstractThe spectrophotometric properties of the trialkyltiniodide‐iodine charge transfer complexes in solution are found to depend on the nature of the solvent. The correlations of these solvent shifts of the absorption bands with various solvent properties are discussed within the frame of the Onsager model of dielectrics. Thus data like dipole moments and stabilization energies of excited states can be obtained.Furthermore a kinetic study of the reactivity of three trialkyltin iodides with iodine atoms has been made in different solvents. The correlation between the absolute rate constants and the polarity (dielectric constant) of the medium suggests increasing solvation of the activated complex with increasing bulkyness of the alkylsubstituent.The solvent free energy of the initial reactant, the excited CT complex, could be calculated from two independently obtained differences of free energies, i.e. the solvent free energy Esolvent going from the standard solvent to the actual solvents and δΔGsolv,x≠' determined from kinetic experiments at different temperatures.
Synthèse et Étude des Propriétés Spectroscopiques D'Halogénures de Benzène Tellurenyle Orthocarbonyles
Authors: Piette J. L. , Pardon M. C. , Weber R. , Baiwir Et M. , Liabrès G. 
Published: September 2010

AbstractGeneral preparation and chemical properties of ortho carbonyl benzene tellurenyl halides are reported. The cis conformation of the oxygen of the carbonyl group and the tellurium atom is in all cases detected by NMR and IR spectroscopies.
Cervicol, a Further Secodolastane Diterpene from the Marine Brown Alga Dictyota Cervicornis kützing (Phaeophyceae, Dictyotaceae)
Authors: Teixeira V. L. , Tomassini T. , Kelecom A. 
Published: September 2010

AbstractCervicol (6) has been isolated from the marine brown alga, Dictyota cervicornis and is shown by spectral methods to be a new secodolastane diterpene.
On the Synthesis and Conformational Aspects of 2‐methyl and 2‐t. Butyl Substituted 1,3‐Cyclopentane and Cyclohexane Diols
Authors: D'Haenens L. , van de Sande C. C. , Tavernier D. , Vandewalle M. 
Published: September 2010

AbstractThe diastereomers of 2‐methyl‐1,3‐cyclopentanediol, 2‐t.butyl‐1,3‐cyclopentanediol, 2‐methyl‐1,3‐cyclohexanediol and 2‐t.butyl‐1,3‐cyclohexanediol have been prepared. Configurational assignment and some conformational aspects are described.
Bioactive Polymers XVI. Immobilization of Novocaine on BiozanR
Authors: Dumitriu S. , Popa M. I. , Simionescu C. R. 
Published: September 2010

AbstractNovocaine was immobilized on BIOZANR after activation with dicyclohexylcarbodiimide.Under the optimum coupling conditions described (temperature, reagent concentration) a reaction product with novocaine content of 37% was obtained. Penicillin G was then bound to the BIOZAN‐novocaine complex resulting in an antibiotic with prolonged action and high water solubility.Penicillin G is continuously released after hydrolysis in acid and basic media.
Preparation of White Marble Samples for Instrumental Neutron Activation Analysis
Authors: Moens L. , De Rudder J. , De Paepe P. , Waelkens M. 
Published: September 2010

AbstractWhen sampling white marble for INAA, using a diamond core drill and circular saw the inevitable contamination can be removed by etching the samples with HNO3 (1N). Samples are etched for five minutes, first immediately after extraction and a second time after irradiation. For cooling the drill and saw, distilled water must be used whereas pro analysi acid is shown to be sufficiently pure to prepare the etchant with.
Solubility Behaviour of Mg‐Containing β‐Ca3 (PO4)2
Authors: Verbeeck R. M. H. , De Bruyne P. A. M. , Driessens F. C. M. , Terpstra R. A. , Verbeek F. 
Published: September 2010

AbstractThe solubilities of synthetic β‐Ca3 (PO4)2 [TCP] and Mg‐containing β‐Ca3 (PO4)2 [TCMP] were determined in the system Ca(OH)2‐Mg(OH)2‐H3PO4‐KCl‐H2O at 25° C. The thermodynamic solubility product of TCP is found to be (1,14 ± 0.10) x 10−30 mol5. l−5. The incorporation of Mg2+ results in a remarkable stabilization of the β‐TCP structure as reflected by a drastic decrease in the amount of solid dissolved for TCMP compared to that for TCP and by the fact that the solutions are undersaturated with respect to calciumhydroxyapatite. On the basis of solid state chemical and thermodynamical principles the solubility behaviour of TCMP solid solutions is discussed. Indications are found that magnesium whitlockite possibly precipitates during the equilibrations of TCMP.
Déplacements Homolytiques Intramoléculaires 10‐Additions Radicalaires À des Peresters γ‐Insatures Influence de Divers Facteurs Sur la Formation D'Esters Cycliques
Authors: Kharrat A. , Gardrat C. , Maillard B. 
Published: September 2010

AbstractFree radical additions of ZH compounds to γ‐unsaturated peresters have been performed in order to determine the limitations upon the induced decomposition (steric effects, type of unsaturation, nature of the neighbouring atom of the perester function). Using γ‐ethylenic peresters and percarbonates led generally to lactones and cyclic carbonates.