bluuebunny/crossref_metadata_2025_split huggingface dataset:
Extraction and Spectrophotometric Determination of Palladium(II) with N‐P‐Chlorophenylbenzohydroxamic Acid
Authors: Agrawal Y. K. , Chudasma S. P. 
Published: September 2010

AbstractA rapid extraction and spectrophotometric determination of palladium with N‐p‐chlorophenylbenzohydroxamic acid (N‐p‐Cl‐BHA) is described. The palladium forms an orange coloured complex with N‐p‐Cl‐BHA at pH 3.0. It is extracted with chlorobenzene and has a maximum absorbance at 430 nm. Its molar absorption coefficient is 7.0×102 1 mol−1 cm−1. The sensitivity of the Pd‐p‐Cl‐BHA complex is enhanced by the addition of dithizone and has a maximum absorbance at 520 nm with a molar absorption coefficient of 3.0×103 1 mol−1 cm−1. The effects of pH, solvents, reagent concentration and diverse ions are studied.
Extraction and Spectrophotometric Determination of Zirconium with N‐P‐Chlorophenylbenzohydroxamic Acid and Morin
Authors: Agrawal Y. K. , Patel S. A. 
Published: September 2010

AbstractA spectrophotometric and a fluorimetric method for the determination of zirconium with N‐p‐chlorophenylbenzohydroxamic acid and morin have been developed. The procedure is based on the extraction of zirconium with N‐p‐Cl‐BHA into iso‐amyl alcohol from 0.2‐0.5 N H2SO4 and then forming its complex with morin. The greenish yellow complex has a maximum absorbance at 420 nm with a molar absorptivity 3.5×104 1 mol−1 cm−1 and gives the fluorescence. The intensity of the Zr‐p‐Cl‐BHA‐morin complex can be enhanced by the addition of ammonium carbonate and the molar absorptivity becomes 1.3×105 1 mol−1 cm−1 at 410 nm.
Subcellular Distribution of α‐D‐Mannosidase Activity in Cultured L1210 Cells
Authors: Zenebergh A. , Trouet A. 
Published: September 2010

AbstractThree types of α‐D‐mannosidase have been found in L1210 cells, a lysosomal one with an optimum activity at pH 4; a soluble one, thermosensitive, with an optimum activity at pH 6, and one with an optimum activity at pH 5.25, probably related to the Golgi apparatus.
The Chemistry of 2H‐3, 1‐Benzoxazine‐2, 4(1H)‐Dione: Reactions with 4h‐furo[3,4‐d][1,3] Oxazine‐2(1h), 4‐Dione
Authors: Olagbemiro Timothy Oyebode 
Published: September 2010

AbstractThe novel tetracyclic ring system represented by 4 and 5 has been developed by the reactions of isatoic anhydride 1a with 3‐isocyanato‐4‐furoyl chloride 3b and by the reaction of 4H‐furo[3,4‐d][1,3] oxazine‐2(1H), 4‐dione 3a with 2‐isocyanatobenzoyl chloride 1b, respectively. The synthesis as well as the mechanism of the reaction are briefly discussed.
Comparative Study of Enthalpies of Hydrogen Bond Formation of Enamino and Amino Ketones
Authors: van Brabant‐Govaerts H. , Huyskens P. 
Published: September 2010

AbstractThe complexation enthalpies ‐ΔHab and the stability constants Kab of complexes between 3‐dimethylamino‐1‐phenyl‐2‐propene‐1‐one and some nine pnenols of increasing acidic strengths were determined in benzene at 298.16 K and compared with the values characteristic of the corresponding base without double CC bond (β‐dimethylaminopropiophenone). The complexation enthalpy ‐ΔHab with a given phenol is systematically lower for the unsaturated base, the differences being of the order of 6 to 10 kJmole−1. The complexation enthalpy of the saturated base with a given phenol is of the order of magnitude of that found for the imidazoles and for the tertiary alkylamines. For the unsaturated base however, the values ressemble these found for the ketones and for the amides. This suggests that contrarily to the saturated base where the complexation involves the nitrogen atom, hydrogen bond formation by the unsaturated compound mainly takes place on the carbonyl group. The complexation enthalpy ‐ΔHab increases for both bases with the pKa of the phenol. From a comparison with similar relations for the amides a value of ‐1.9 for the pKa in water of the unsaturated base is found. The experimental value in acetic acid anhydride is ‐1.0. Applying the same method a value of ‐4.0 is estimated for the pKa of acetone and of ‐5.8 for acetophenone. The standard entropy change −ΔS0ab varies linearly with ‐ΔHab for both compounds but the straight line is shifted downwards from about 10 JK−1mole−1 for the unsaturated base. This is partly due to the presence of two lone pairs of electrons on the carbonyl group.
Een Nomogram‐Weergave Van Concentratie‐Effecten in Verdunde Polymeeroplossingen
Authors: Peeters F. A. H. 
Published: September 2010

AbstractThe influence of the concentration c on quantities, such as the coefficient of sedimentation and the c‐reduced specific viscosity or osmotic pressure, can be depicted in a nomogram by a curve, characteristic for the homologous, diluted polymer/solvent system. Measured at a single concentration, their values for c=0 can be derived from the nomogram.
Solution Conformation of Calcium‐Ionomycin
Authors: Anteunis Marc J. O. , Verhegge George 
Published: September 2010

AbstractThe solution conformation of Ca2+‐ionomycin in CDCl3 has been revealed by 1H nmr spectroscopy to be almost identical with that observed2 in the crystal. Only minor differences (e.g. the conformational state of the penultimate ring) were observed. The completeness of the screening for the ion from the membranic bilayer surrounding is therefore also best explained2 by a bimolecular aggregation of the ionophore. It is concluded that the cationic transport will be mainly governed by entropy contributions, as neither the flexible architecture nor the dimension of the aggregate will account for large enthalpy changes during capture and during the transfer along the lipophilic trajectory.
A preliminary investigation of the sorption of hydrogen at high pressure by MoS2
Authors: Sampson C. , Thomas J. M. , Vasudevan S. , Wright C. J. 
Published: September 2010

AbstractHydrogen is sorbed by “amorphous” molybdenum sulphide at two sites. One site becomes saturated at pressures less than 1 atmosphere and at temperatures less than 423 K. This is the site at which linear S‐H bonds form. The second site is occupied at higher temperatures, and the preliminary data suggests saturation is reached at ∼ 50 Atm.
On the Role of Promoter Atoms in Unsupported Hydrodesulfurization Catalysts: Influence of Preparation Methods
Authors: Candia Roberto , Clausen Bjerne S. , Topsøe Henrik 
Published: September 2010

AbstractUnsupported Co‐Mo catalysts were prepared by two different methods:by the co‐maceration (CM) method and by a new homogeneous sulfide precipitation (HSP) method. Structural examinations by means of XRD and Mössbauer Emission Spectroscopy (HES) show that the CM catalysts contain several phases with Co9S8 being the dominant cobalt containing phase. On the other hand, the HSP catalysts are shown to contain only one CO phase within an extended range of Co/Mo atomic ratios and this phase is the Co‐Mo‐S phase. Like in the case of supported catalysts, the Co‐Mo‐S phase is shown to be the phase responsible for the activity, whereas Co9S8 is shown to have little or no influence on the activity. The differences in activity observed between the HSP and CM catalysts as well as other unsupported catalysts studied in the literature all seem to be related to differences in the preparation procedures resulting in different promotional efficiencies for the formation of Co‐Mo‐S.
Coordination Compounds of Heterocyclic and Derivatives I‐ Synthesis AZO Characterization of Bivalent Metal Chelates with Some Imidazole AZO Dyes
Authors: Mahmoud M. R. , Abd El‐Hamide R. , Wahab A. A. Abdel , Salman H. M. 
Published: September 2010

Abstract2‐(4‐R‐Phenylazo)‐4,5‐diphenylimidazole (R=H, PAI; = OH, HPAI; = COOH, CPAI) acts as a bidentate chelating ligand to form stable complexes with Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) ions. It is concluded that the ligands are bonded to the metal ion through the α‐nitrogen atom of the aryl azo group and N‐3 of the imidazole ring. The apparent formation constants of the complexes in solution have been determined.
The Crystal Structure of 2,4‐dioxa‐3‐oxo‐3‐Phospha‐3‐Phenoxy‐trans‐Bicyclo[4.4.0]decane, A Cyclic Phosphate with an Axial P = 0
Authors: van Nuffel P. , Lenstra A. T. H. , Geise H. J. 
Published: September 2010

AbstractThe isomer of 2,4‐dioxa‐3‐oxo‐3‐phospha‐3‐phenoxy‐trans‐bicyclo [4.4.0] decane with the configuration P3(S), C1(S), C6(R) or its mirror image crystallizes in the space group P21/n with Z = 8, a = 20.59, b = 6.587, c = 20.67 Å, β = 114.9°. The molecule has an all chair form with P = 0 pointing into axial and P‐OR into equatorial direction. It is the first X‐ray determination of a cyclic phosphate with an axial P = 0.Systematic geometrical differences in comparison with cyclic phosphates having an equatorial P = 0 are discussed. They are found to be in complete agreement with predictions based on the anomeric effect.
Structure de la N‐Acetyl‐L‐Thiazolidinemethylcarboxamide‐4 C7H12N2O2S
Authors: Tinant Bernard , Declercq Jean‐Paul , Germain Gabriel , van Meerssche Maurice 
Published: September 2010

AbstractThe crystal and molecular structure of N‐acetyl‐L‐thiazolidine‐4‐methyl‐carboxamide has been determined by three dimensional X‐ray diffraction analysis. The thiazolidine ring conformation is compared with these of N‐acetyl‐L‐thiazolidine‐4‐carboxylic acid and N‐acetyl‐L‐thiazolidine‐4‐carboxamide.Crystal data are as follow: hexagonal, P65, a = b = 8.785 (4), c = 20.773 (4) Å, V = 1388.4 Å3, Mr = 188.25, Dx = 1.35 Mg m−3 for Z = 6.
Alkaloids from Catharanthus Roseus. Isolation and Identification of 17‐Desacetoxyvinblastine and 17‐Desacetoxyleurosine
Authors: De Bruyn André , De Taeye Leo , Simonds Ronald , Verzele Maurice , De Pauw Christiaan 
Published: September 2010

Abstract17‐desacetoxyvinblastine and 17‐desacetoxyleurosine have been isolated from Catharanthus roseus. The latter has not been recognized so far in this plant. The 1H NMR and mass spectrometry data confirming the proposed structures are presented.
Solubilité des Oxydes de Cobalt(II), de Cuivre(I), de Cuivre(II), de Nickel(II) et du Bromure de Tétraméthylammonium dans les Solvants mixtes EAU‐DMSO, à 25°C
Authors: Richard J. M. , Sabiani N. , Zahra C. 
Published: September 2010

AbstractIn the mixed solvent water‐DMSO, at 25°C, the solubility of Co(II), Cu(I), Cu(II) and Ni(II) oxides have been determined by atomic absorption spectroscopy and the solubility of tétraméthylammonium bromide by potentiometry.
The role of Dimethylsulphoxide as a Solvent in the Kinetics of the Acid and Alkaline Hydrolyses of Benzyl Acetate
Authors: Khalil Fayez Y. , Hanna M. T. 
Published: September 2010

AbstractThe rate of the acid‐catalysed hydrolysis of benzyl acetate in DMSO‐water mixtures increases slightly first then decreases with increase of DMSO content of the medium in a normal manner. However, the rate of the base‐catalysed reaction in the same solvent system increases with addition of DMSO. This behaviour was attributed to the ability of the DMSO molecules to desolvate hydroxide anions through formation of 1:2 association complexes with water molecules. A kinetic equation involving the simultaneous direct as well as inverse proportionality of the rate to the water concentration was explained. The effects of the dielectric constant and solvation changes on the rate constant and thermodynamic parameters were discussed.
Hydrogenation of α, β‐Unsaturated Aldehydes and Ketones on New AlPO4‐Supported Nickel Catalysts
Authors: Campelo J. M. , Garcia A. , Luna D. , Marinas J. M. 
Published: September 2010

AbstractThe liquid phase catalytic hydrogenation of Acrolein (A) and Methyl‐vinylketone (MVK) were studied over a series of new nickel catalysts supported on AlPO4, and AlPO4‐Al2O3 and AlPO4‐SiO2 systems, in methanol as solvent, at initial hydrogen pressure of 4.1 bar and temperatures between 298‐323 K. The hydrogenation of the C‐C double bond, yielding propanal or butanone were obtained in a first step at a yield of 100% because the reduction of butanone was not possible and, in the acrolein hydrogenation a kinetically consecutive process, acrolein → propanal → 1‐propanol, was obtained and 1‐propanol appeared just after acrolein was finished.The C‐C double bond of acrolein was hydrogenated more slowly than it was in methyl‐vinyl‐ketone. This result is probably due to an electronic effect of substitution from the methyl group. Moreover, the catalytic activity varies markedly with the support and was found to diminish as the nickel content decreased. The order of decreasing activity for the C‐C double bond: Ni/AlPO4‐SiO2 > Ni/AlPO4 > Ni/AlPO4‐Al2O3 is valid for the hydrogenation of both substrates and it is associated with an effect of metal‐support interaction.
Isomérisation des Ions Avant Leur Fragmentation en Spectrométrie de masse: Transfert de Groupes Phényles dans les Epoxydes, Aldéhydes et Cétones Protones
Authors: Audier H. E. , Milliet A. , Bouchoux G. , Denhez J. P. 
Published: September 2010

AbstractMIKE spectra of protonated, substituted phenylacetophenones, show that their fragmentations occur after the interconversion of phenyl groups.
1,2,3‐Triazolo(1,5)Azines et Autres Hétérocycles Azotés Dérivés D'Azine‐carboxaldéhydes
Authors: Maury Georges , Meziane Driss , Sraïri Driss , Paugan Jean‐Paul , Paugam Renée 
Published: September 2010

Abstractα‐(N)‐azine‐carboxaldehydes are convenient precursors of 1,2,3‐triazolo (1,5) azines. Through oxidative cyclization of the corresponding hydrazones we have prepared the new 1,2,3‐triazolo (1,5‐b)pyridazine and 1,2,3‐triazolo (1,5‐a)pyrazine. Unlike the other azaindolizines these compounds are degraded by electrophiles. Attempts to prepare imidazo(1,5‐c) pyrimidine or derivatives have been carried out either from 4‐aminomethylpyrimidine or from ethyl 2‐(4‐pyrimidinyl)propionate.
The Crystal Structure of 2‐Hydroxyiminomethyl‐4′‐Carbamoyl‐1, 1′‐oxybis(Methylene)Dipyridinium Dichloride Monohydrate (HI‐6) (laq.)
Authors: van Havere W. , Lenstra A. T. H. , Geise H. J. , van Den Berg G. R. , Benschop H. P. 
Published: September 2010

AbstractC14H18Cl2N4O4 is monoclinic, P21/n with Z = 4, a = 13.347(4), b = 8.988(5), c = 15.191(6)Å and β = 106.14(4)°. RW = 0.0829 for 2018 reflections.The title compound, reactivating phosphylated acetylcholinesterase, is considered for use as antidote against intoxication with certain organophosphates, primarily the nerve agent soman. It has the E‐configuration at the oxime moiety. The possibility of Π‐localization in one pyridinium ring is discussed.
Alcoolyse de L'Epichlorhydrine du Glycerol sur Catalyseur Solide Synthèse Commode D'éthers du Chloro‐3 Propane Diol‐1, 2
Authors: Thuy Vu Moc , Petit Huguette , Maitte Pierre 
Published: September 2010

AbstractMonoethers of 3‐chloro‐1, 2 propanediol were easily obtained in good yields from epichlorohydrin and alcohols under catalysis of actived montmorillonite K 10.
Structure de Triterpenoides Nouveaux Isoles de Atroxima Afzeliana
Authors: Warin Babady‐Bila R. , Delaude C. , Huls R. 
Published: September 2010

AbstractThe roots bark saponin of Atroxima afzeliana yields on hydrolysis three new triterpenoids: atroxigenic acid, atroxigenin and atroxigenic acid lactone.
Structure de Complexes du Cuivre(I) Avec la Thiourée: II. ‐ Sulfate D'Hexakis (Thiourée)‐Dicuivre (I) Monohydrate Cu2 [SC (NH2) 2] 6SO4. H2O
Authors: van Meerssche M. , Kamara R. , Declercq J. P. , Germain G. 
Published: September 2010

AbstractThe title compound is a new Cu(I)‐thiourea complex containing binuclear cyclic cations (Cu2tu6)2+ wich, contrary to other similar knew compounds, exhibits a non‐centrosymmetrical configuration. Crystal data are as follow: orthorhombic, Pbca, a = 19.251(7), b = 12.309(2), c = 21.484(5)Å, Dx = 1.82 Mg m−3 for Z = 8.
IR Study on the Solid State Reaction between Iron Hydroxide and KCN
Authors: Hoste S. , Verdonck L. , van Der Kelen G. P. 
Published: September 2010

AbstractFreshly prepared hydrated ferric oxides easily decompose, even at room temperature. The ESCA O is spectrum of goethite, heated inside the spectrometer at different temperatures, however, shows that thermal transformation of goethite to hematite only starts around 200°C. In an attempt to estimate the relative amounts of ferrihydrite and goethite in artificial mixtures of the synthetic pure compounds by IR spectroscopy the use of KCN as an internal standard was tested. It was noted however that a selective solid state reduction, of the Fe(III)‐ions in the amorphous fraction to Pe(II)‐cyano complexes occurs during the preparation of the samples for analysis. A rough correlation is found between the fraction of oxalate soluble Fe in different mixtures and the ratio of the peak intensities of the CEN stretching vibrations in free KCN (2080 cm−1) and the Fe(II)‐pentacyano‐aquo complex (2044 cm−1).
Études Structurales en Relation Avec le Concept de Substitution “Capto‐Dative” I. Structures aux Rayons X du Bis(Éthylthio)‐2, 3 Diphényl‐2, 3 Butanedinitrile‐1, 4 C20H20N2S2 et du bis (Éthylthio)‐2, 3 BIS (p‐Tolyl)‐2, 3 Butanedinitrile‐1, 4 C22H24N2S2
Authors: Tinant B. , Arte E. , Parfonry A. , Declercq J. P. , Germain G. , van Meerssche M. 
Published: September 2010

AbstractThe crystal structures of the title compounds have been determined using X‐Ray diffractometry in order to study the effects of capto‐dative substitution on molecular geometry. The carbon‐carbon central bond is significantly stretched. 2, 3‐Bis (ethylthio) ‐2, 3‐diphenyl‐1, 4‐butanedinitrile (compound A) is triclinic, P1, with a = 15.703 (9), b = 14. 902(5), c = 8.655(4)Å, δ = 97.52(3), β = 89.87(4)°, γ = 75.59(4)°, V = 1943.3 Å3, Z = 4 and Dx = 1.20 Mg m−3. 2, 3‐Bis (ethylthio)‐2, 3‐bis (p‐tolyl)‐1, 4‐butanedinitrile (compound B) is monoclinic, P2/n with a = 16‐872(8), b = 12, O82(5), c = 10.329(5)Å, β = 94.16(4)°, V = 2100.0 Å3, Z = 4 and Dx = 1.21 Mg m−3.
Contribution to the Theoretical Study of the Onno Dimer
Authors: Sana Michel , Leroy Georges 
Published: September 2010

AbstractIn this work we study the geometry, the vibrational properties including the IR‐absorptions and the thermodynamical properties of the NO radical dimers containing a central NN bond. An ab initio‐SCF potential energy surface is built up at the 6‐31G level. We find two equilibrium structures: the most stable having a trans conformation. The cis form is less stable with respect to the first by 2 kcal mol−1. Two transition structures separate the minimum energy points: the first respectively low in energy corresponds to a perpendicular arrangement and the second higher in energy has a linear structure. The predicted IR spectra, as well as the heat of formation of the dimers, are somewhat different from the experimental data. It seems that the exact nature of the experimentally observed dimer remains an open question.
Biomolecules Bearing the SAsMe2 Group: Nucleoside Derivatives
Authors: Dereu Norbert L. M. , Zingaro Ralph A. 
Published: September 2010

AbstractA number of compounds of the type GS‐ and GSeAsR2, where G is a monosaccharide, a thio amino acid, a thiol‐containing di‐ or tripeptide or cholesterol display carcinostatic activity in in vivo mouse test systems.The synthesis and characterization of derivatives in which G is a nucleoside and the synthesis of an arsenic‐containing precursor of 5‐thioglucose are described. Of the nucleoside derivatives thus far screened, none displays carcinostatic activity.
Taft Four Parameter Equation as a Mechanistic Tool in Chromic Acid Oxidation of Aliphatic Esters
Authors: Musala Reddy P. , Jagannadham V. , Sethuram B. , Navaneeth Rao T. 
Published: September 2010

AbstractThe utility and applicability of Taft four parameter equation in the chromic acid oxidation of acetate esters of methanol, ethanol, i‐propanol, n‐propanol, i‐butanol and n‐butanol in 20% aqueous acetic acid and 3.OM H2SO4.
Anomalies dans L'esterification D'acides Éthyléniques par la Méthode AU N,N′‐Carbonyldiimidazole
Authors: Montaudon E. , Campagnole M. , Bourgeois M. J. , Maillard B. 
Published: September 2010

AbstractThe reaction of N,N′‐carbonyldiimidazole with but‐3 enoic acid did not lead to the expected azolide; its rearrangement into conjugated isomer was followed by imidazole addition to the double bond. These two reactions make inefficient this preparative method for esters and peresters of alkyl substituted α, β‐ethylenic acids and β,γ‐ethylenic acids without substituent on the α‐carbon.
Crystal Structure of 3‐Phenyl‐4‐Tosylimino‐1,3‐Thiazetidine‐2‐One
Authors: King Geoffrey S. D. , van Meervelt Luc , L'abbé Gerrit 
Published: September 2010

AbstractStudies on the chemistry of 3‐phenyl‐4‐tosylimino‐1,3‐thiazetidine‐2‐one (4) have shown that the molecule can be attacked by nucleophiles at both the electrophilic centres C2 and C4 of the ring system.1 This interesting aspect prompted us to determine its crystal structure for comparison with those of compounds 1‐3.2
NMR Studies on Imidines. II. 1H AND13 C Nuclear Magnetic Resonance Study on The Tautomerism and Geometrical Isomerism of 3‐Aryliminoisoindolinones
Authors: Spiessens Luc I. , Anteunis Marc J. O. 
Published: September 2010

Abstract3‐Aryliminoisoindolinones 2. [Ar = phenyl, p‐tolyl, 2′‐pyridyl, 2′‐amino‐6′‐pyridyl, 3′‐ pyridyl; and 2,6‐bis(1‐oxo‐3‐isoindolinylidene)aminopyridine (2f)I have been fully examined by 1H and 13C NMR spectroscopy. A complete analysis of 13C‐ 1H coupling constants is given for three of the compounds (2c, 3a, 4b). Only the arylimino tautomeric forms are present in polar (DMSO‐d6; CD3OD) and apolar solvents (CDCl3) as established by comparison of 1H and 13C NMR chemical shift values of 2 with those of suitable model compounds (3, 4, 6 and 7). It is shown that both the endo‐ and exocyclic N‐methylated aryliminoisoindol(en)inones (3 and 4) adopt the E configuration (due to steric hindrance of the N‐methyl group) but that the title compounds are present in solution as 4:1 mixtures of Z and E components (Figure 4). This is not the case for the 2′‐pyridyl derivatives (2c, 2e, 2f) where the Z form benefits from an intramolecular hydrogen bond.An interesting proximity 13C chemical shift effect is produced by the variation in steric crowding in the E vs Z isomers of the title compounds.
High Yield Synthesis of Filicinic Acid Based on the Polychlorination of 4,4‐Dimethyl‐2‐Cyclohexenone. Part I: One‐pot Synthesis of 2,3,5,6‐Tetrachloro‐4,4‐Dimethyl‐2,5‐Cyclohexadienone
Authors: De Buyck Laurent , Verhé Roland , De Kimpe Norbert , Schamp Niceas 
Published: September 2010

Abstract2, 3, 5, 6‐Tetrachloro‐4,4‐dimethyl‐2,5‐cyclohexadienone (4), a useful precursor for synthetic filicinic acid (5). was prepared in 88‐94% yield by poly‐chlorination of 4,4‐dimethyl‐2‐cyclohexenone (1) or 4,4‐dimethylcyclohexanone (11) with chlorine in dimethylformamide under dehydrochlorinating conditions. Introduction of the fourth chlorine atom required a medium saturated with hydrogen chloride and an optimal temperature in the range of 40‐70°C. This is in accord with chlorination of the enol resulting from Michael addition of hydrogen chloride to the trichlorodienone 3, followed by dehydrochlorination. Besides the one‐pot procedure for 4, stepwise methods provided several intermediates in high yields.
Complexes of Bis(stannyl)Methanes, ‐Propanes and ‐Butanes with Hexamethylphosphoric Triamide
Authors: Jurkschat Klaus , Gielen Marcel 
Published: September 2010

AbstractKuivila (1) has shown that bis(dichloromethylstannyl)methane forms a complex with two bridging molecules of dimethylsulfoxide whereas (chlorodimethylstannyl)(dichloromethylstannyl)methane gives a one‐to‐one complex also with a bridging Me2SO oxygen atom. This paper prompt us to disclose some results concerning the complexes of bis(halodiphenylstannyl)methanes, 1, and of 1,3‐bis(chlorodiphenylstannyl)propane, 2, (2) with hexamethylphosphoric triamide (HMPA), viz 3≡1,: HMPA, and 4≡2:2 HMPA (2).