bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of regioregular poly(3‐octylthiophene)s via Suzuki polycondensation and end‐group analysis by matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry
Authors: Jayakannan M. , Lou X. , van Dongen Joost L. J. , Janssen René A. J. 
Published: February 2005

AbstractRegioregular poly(3‐octylthiophene)s were synthesized through a palladium‐catalyzed Suzuki polycondensation of 2‐(5‐iodo‐4‐octyl‐2‐thienyl)‐4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolane. The effects of the palladium catalyst {tetrakis(triphenylphosphine)palladium(0) [Pd(PPh3)4], palladium(II) acetate [Pd(OAc)2], [1, 1′‐bis(diphenylphosphino)ferrocene]dichloropalladium(II) [Pd(dppf)Cl2], tris(dibenzylideneacetone)dipalladium(0), or bis(triphenylphosphine)palladium(II) dichloride [Pd(PPh3)2Cl2]} and the reaction conditions (bases and solvents) were investigated. NMR spectroscopy revealed that poly(3‐octylthiophene)s prepared via this route were essentially regioregular. According to size exclusion chromatography, the highest molecular weights were obtained with in situ generated Pd(PPh3)4 and tetrakis(tri‐o‐tolylphosphine]palladium(0) {Pd[P(o‐Tol)3]4} catalysts or more reactive, phosphine‐free Pd(OAc)2. Matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry was used to analyze end groups and allowed the determination of some mechanistic aspects of the Suzuki polycondensation. The polymers were commonly terminated with hydrogen or iodine as a result of deboronation and some deiodination. Pd(PPh3)4, Pd(PPh3)2Cl2, and Pd[P(o‐Tol)3]4 induced aryl–aryl exchange reactions with the palladium center and resulted in some chains having phenyl‐ and o‐tolyl‐capped chain ends. Pd(dppf)Cl2 yielded only one type of chain, and it had hydrogen end groups. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1454–1462, 2005
Solid‐state polymerization of 2,3,6,7,10,11‐hexa(methacrylate) triphenylene
Authors: Yu Xiang , Chen Yangbin , Pan Caiyuan , Di Yan , Zhang Junying 
Published: February 2005

AbstractA new monomer, 2,3,6,7,10,11‐hexa(methacrylate) triphenylene (HMTP), and its crystals have been successfully synthesized, and the solid‐state polymerization under UV irradiation has been investigated. The photo polymerization of HMTP in solid was confirmed by the reduction of vinyl bonds in the FT‐IR and UV spectra of PHMTP in comparison with the corresponding spectra of its precursor. Thus, IR spectroscope was used to follow the polymerization of HMTP crystals under UV irradiation, and kinetic studies show a first‐order reaction with rate constant of 6.12 × 10−3 min−1. This value is slightly larger than that measured by the weight method. The polarizing optical microscope and X‐ray diffraction were used to study the crystal structure difference between the polymers and its monomer. The results show that the polymers' crystals obtained from photo polymerization kept the monomer crystal lattice. Because of strong overlap between the π‐electron of the triphenylene, the monomer and polymer crystals showed different fluorescence properties. All these results proved that the photo polymerization of HMTP crystals is governed by the packing structure of monomer molecules; in other words, this reaction is just lattice controlled polymerization. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1526–1534, 2005
Impact of intraguild predation and lambda‐cyhalothrin on predation efficacy of three acarophagous predators
Authors: Provost Caroline , Coderre Daniel , Lucas Éric , Chouinard Gérald , Bostanian Noubar J 
Published: February 2005

AbstractThis laboratory study reports the interaction of three predators found in commercial apple orchards in Quebec, Hyaliodes vitripennis (Say) (Hemiptera: Miridae), Harmonia axyridis Pallas (Coleoptera: Coccinellidae) and Amblyseius fallacis (Garman) (Acarina: Phytoseiidae). First, intraguild predation between H vitripennis and the two other predators was characterized in the absence and presence of their extraguild prey, Tetranychus urticae Koch. The results showed an asymmetrical interaction in favour of the larger predator and the levels of intraguild predation were weak for the two predatory combinations. Presence of the phytophagous mite reduced the intensity of intraguild predation in the predatory combination of H axyridis and H vitripennis. Second, the effects of intraguild predation and the application of lambda‐cyhalothrin on predation efficacy of the predators were evaluated. The application of the insecticide reduced prey consumption of H vitripennis and H axyridis but did not affect that of A fallacis. Combination of predators and an insecticide application resulted in two different situations depending on the species involved: a reduced predation efficacy for the combination of H vitripennis and H axyridis due to a knockdown effect caused by the insecticide, and no effect on T urticae consumption for H vitripennis and A fallacis. It is suggested that an integrated pest management program based on H vitripennis, A fallacis and lambda‐cyhalothrin may be evaluated to repress phytophagous mites in Quebec orchards. Copyright © 2005 Society of Chemical Industry
Insecticide resistance inBemisia tabaci(Homoptera: Aleyrodidae) populations from Crete
Authors: Roditakis Emmanouil , Roditakis Nikos E , Tsagkarakou Anastasia 
Published: February 2005

AbstractThe resistance levels to α‐cypermethrin, bifenthrin, pirimiphos‐methyl, endosulfan and imidacloprid were determined inBemisia tabaci(Gennadius) from Crete. FiveB tabacipopulations collected from greenhouse and outdoor crops were bioassayed and compared with a reference susceptible strain.Bemisia tabacicollected in a floriculture greenhouse exhibited the highest resistance against all insecticides: at LC50, resistance factors were 23‐fold for bifenthrin, 80‐fold for α‐cypermethrin, 18‐fold for pirimiphos‐methyl, 58‐fold for endosulfan and 730‐fold for imidacloprid. A population collected on outdoor melons was more susceptible than the reference strain against all insecticides tested, suggesting the occurrence of local highly susceptibleB tabacipopulations in ‘refugia’. In pairwise comparisons of resistance levels, correlation was observed between the LC50values of the pyrethroid insecticides bifenthrin and α‐cypermethrin. Copyright © 2005 Society of Chemical Industry
The use of stainless steel in structures
Authors: Gardner Leroy 
Published: February 2005

AbstractThe past 15 years have seen the introduction or major revision of structural stainless steel design codes throughout the world, and at the same time, interest in the use of stainless steel in construction has been accelerating. Historically the high initial material cost of stainless steel has limited its use primarily to specialist and prestige applications. However, the emergence of design codes, a better awareness of the additional benefits of stainless steel and a transition towards sustainability are bringing more widespread use into conventional structures. Although a number of similarities between stainless steel and ordinary carbon steel exist, there is sufficient diversity in their physical properties to require separate treatment in structural design. In addition to the straightforward differences in basic material properties (such as Young's modulus and yield strength), further fundamental differences exist, such as the nature of the stress–strain curve and the material's response to cold‐work and elevated temperatures; these have implications at ultimate, serviceability and fire limit states. This paper describes the use of stainless steel as a structural material, discusses current structural design provisions, reviews recent research activities and highlights the important findings and developments.
Fabrication of AlGaN/GaN double‐insulator metal–oxide–semiconductor high‐electron‐mobility transistors using SiO2 and SiN as gate insulators
Authors: Balachander Krishnan , Arulkumaran Subramaniam , Sano Y. , Egawa Takashi , Baskar Krishnan 
Published: February 2005

AbstractWe report on the fabrication of AlGaN/GaN double‐insulator MOSHEMTs using SiO2 and SiN as the prime gate insulators. Both the dielectrics showed enhanced saturation current density and pinch‐off voltage compared to conventional HEMTs. The SiO2/SiN/AlGaN/GaN MOSHEMTs exhibited a low current collapse and low leakage current compared to SiN MISHEMTs and unpassivated HEMTs. However, the SiN/SiO2/AlGaN/GaN MOSHEMTs exhibited a lower current collapse coupled with moderate leakage current compared to SiO2 MOSHEMTs and unpassivated HEMTs. The comparison of device dc characteristics of double‐insulator MOSHEMTs with single‐insulator MOSHEMTs revealed its superiority in reducing the problem of current collapse and leakage current simultaneously. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Simultaneous determination of paracetamol and dextropropoxyphene in human plasma by liquid chromatography/tandem mass spectrometry: application to clinical bioequivalence studies
Authors: Yin Ophelia Q. P. , Lam Sherry S. L. , Chow Moses S. S. 
Published: February 2005

AbstractA liquid chromatography/mass spectrometry method for simultaneous determination of paracetamol and dextropropoxyphene in human plasma is described. Paracetamol and dextropropoxyphene, together with their internal standards (tolbutamide and pyrroliphene), were extracted from 0.5 mL of plasma using solid‐phase extraction. The chromatography was performed using a Thermo Hypersil APS‐2 Amino column (250 mm × 4.6 mm, 5 μm) with a mobile phase consisting of acetonitrile and 0.4% glacial acetic acid in water (20:80). The total run time was 6 min for each sample. The triple‐quadrupole mass spectrometer was operated in both positive (for detection of dextropropoxyphene and its IS pyrroliphene) and negative (for detection of paracetamol and its IS tolbutamide) modes using a polarity‐switching technique. Multiple reaction monitoring was used for quantification. The method was linear over the concentration range of 0.1–20 μg/mL for paracetamol and 0.5–80 ng/mL for dextropropoxyphene. The intra‐ and inter‐day precision were less than 10%, and the accuracy ranged from 92.2–110.9%. The lower limits of quantification were 0.1 μg/mL for paracetamol and 0.5 ng/mL for dextropropoxyphene. The present method provides a robust, fast and sensitive analytical tool for both paracetamol and dextropropoxyphene, and has been successfully applied to a clinical bioequivalence study in 14 subjects. Copyright © 2005 John Wiley & Sons, Ltd.
Resolution, quantification and confirmation of betamethasone and dexamethasone in equine plasma by liquid chromatography/tandem mass spectrometry
Authors: Luo Yi , Uboh Cornelius E. , Soma Lawrence R. , Guan Fuyu , Rudy Jeffrey A. , Tsang Deborah S. 
Published: February 2005

AbstractThis method describes the simultaneous separation, identification, quantification and confirmation of betamethasone (BTM) and dexamethasone (DXM) in equine plasma by liquid chromatography (LC) integrated with multidimensional tandem mass spectrometry. Analytes were directly extracted from equine plasma by methyltert‐butyl ether (MTBE). The residues were reconstituted with sample solvent. LC separation of the analytes was performed on a Hypercarb column using acetonitrile/water/formic acid (95:5:0.5, v/v/v) as the mobile phase. Sample screening, quantification and confirmation were performed in multiple reaction monitoring (MRM) mode. The method was linear over the concentration range of 0.1–75 ng/mL for both analytes. Limit of detection (LOD) was 50 pg/mL and that of quantification (LOQ) was 100 pg/mL for both analytes. The limit of confirmation (LOC) for the presence of BTM or DXM by MRM was 0.5 ng/mL. The intra‐and inter‐day precisions expressed as coefficient of variation (CV) for quantification of DXM and BTM from 0.1 to 50 ng/mL were less than 7% and the accuracy was in the range of 97–105%. This method is capable of distinguishing BTM from DXM when both analytes are simultaneously present in equine plasma. Measurement uncertainty for both analytes was estimated at less than 16%. The method is rapid, specific, selective, sensitive, simple and reliable. The importance of this method is its usefulness in directly identifying and differentiating BTM from DXM without derivatization. Copyright © 2005 John Wiley & Sons, Ltd.
Adjusting for observable selection bias in block randomized trials
Authors: Ivanova Anastasia , Barrier Robert C. , Berger Vance W. 
Published: February 2005

AbstractIn this paper, we propose a model‐based approach to detect and adjust for observable selection bias in a randomized clinical trial with two treatments and binary outcomes. The proposed method was evaluated using simulations of a randomized block design in which the investigator favoured the experimental treatment by attempting to enrol stronger patients (with greater probability of treatment success) if the probability of the next treatment being experimental was high, and enrol weak patients (with less probability of treatment success) if the probability of the next treatment being experimental was low. The method allows not only testing for the presence of observable selection bias, but also testing for a difference in treatment effects, adjusting for possible selection bias. Copyright © 2005 John Wiley & Sons, Ltd.
PIXE analysis of Chinese Ru celadon made in the 11–12th centuries
Authors: Zhang B. , Cheng H. S. , Zhao W. J. , Gao Z. Y. , Li G. X. , Xie J. Z. , Guo M. , Yang F. J. 
Published: February 2005

AbstractThe Ru kiln is one of the five most famous kilns (Ru, Guan, Ge, Ding and Jun kilns) in the Chinese Song Dynasty (AD 960–1279). The Ru Kuan kiln at Qingliang Temple, Henan Province, originated from the Ru folk kiln. PIXE and factor analysis were employed to study the difference between the folk celadon and the Kuan celadon. The relationship between the Ru Kuan and Ru folk celadons from the Qingliang Temple kiln site and the Ru celadon from the Zhanggongxiang kiln site, found in the last few years, was also studied. The experimental results showed that the same body raw material was used for the production of the Ru Kuan and Ru folk celadons whereas the Ru celadon from Zhanggongxiang was produced from a different body raw material. Factor analysis based on chemical components of the glaze is able to differentiate between the celadons, i.e. Ru Kuan celadon, Ru folk celadon and the Ru celadon from Zhanggongxiang. Copyright © 2005 John Wiley & Sons, Ltd.
Escape of photons and electrons from an HPGe detector at 81 keV
Authors: Yılmaz Ercan , Peköz Rengin , Can Cüneyt 
Published: February 2005

AbstractEscape of Ge K x‐rays, Compton‐scattered incident radiation and photoelectrons from an HPGe detector was investigated for 81 keV incident photons. All three escape mechanisms were observed in the same experiment. Experimental escape fractions were compared with the results from Monte Carlo simulations. Good agreement was obtained for the escape of photons. However, the simulations underestimated the escape of photoelectrons. Copyright © 2005 John Wiley & Sons, Ltd.
Organic‐Inorganic Hybrids: Preparation and Structural Characterization of (Bu4N)2[Mo6O17(NAr)2] and (Bu4N)2[Mo6O18(NAr)] (Ar = o‐CH3C6H4)
Authors: Li Qiang , Wu Pingfan , Wei Yongge , Xia Yun , Wang Yuan , Guo Hongyou 
Published: February 2005

AbstractIn the presence of N, N′‐dicyclohexylcarbodiimide (DCC), (Bu4N)2[Mo6O18(NAr)] (1) and (Bu4N)2[Mo6O17(NAr)2] (2), Ar = o‐CH3C6H4, have been synthesized via the reaction of [α‐Mo8O26]4— with o‐toluidine. If the hydrochloride salt of o‐toluidine was added into the reactive mixture, only the monofunctionalized imido derivative of [Mo6O19]2— was obtained; the bifunctionalized derivative of [Mo6O19]2— was exclusively synthesized in the presence of non‐protonated o‐toluidine. The molecular and crystal structures of the hybrid compounds 1 and 2 were determined by X‐ray single crystal diffraction, and their UV, IR and NMR spectra were compared. Additionally, a possible reaction mechanism was proposed.
Bis(trifluoromethyl)mercury(II) Complexes with Purine and 3, 5‐Dimethyl‐4′‐amino‐triazole as Ligands, [Hg(CF3)2(Pur)]4 and [Hg(CF3)2(Dat)]2. Bis(trifluormethyl)quecksilber(II)‐Komplexe mit Purin und 3, 5‐Dimethyl‐4′‐amino‐triazol als Liganden: [Hg(CF3)2(Pur)]4 and [Hg(CF3)2(Dat)]2
Authors: Nockemann Peter , Schulz Frank , Naumann Dieter , Meyer Gerd 
Published: February 2005

AbstractColourless single crystals of [Hg(CF3)2(Pur)]4 and [Hg(CF3)2(Dat)]2 were obtained from aqueous and etheric solutions of the respective components Purine, (imidazo[4, 5‐d]pyrimidine, Pur), 3, 5‐dimethyl‐4′‐amino‐triazole (Dat) and bis(trifluoromethyl)mercury(II), Hg(CF3)2. [Hg(CF3)2(Pur)]4 crystallizes with the tetragonal system (P‐4, Z = 8, a = 1486.8(2), c = 1026.2(1) pm, Rall = 0.0657) with tetrameric molecules consisting of four purine molecules bridged by slightly bent Hg(CF3)2 molecules forming a cage with the CF3 ligands surrounding this cage. The two modifications of [Hg(Dat)(CF3)2]2 (I: 170 K, triclinic, P‐1, Z = 2, a = 814.9(2), b = 845.4(2), c = 968.4(3) pm, α = 106.55(2)°, β = 103.41(2)°, γ = 110.79(2)°, Rall = 0.1189; II: monoclinic, P21/c, Z = 8, a = 879.8(2), b = 1731.0(3), c = 1593.9(3) pm, β = 106.89(2)°, Rall= 0.1199) both contain dimeric molecules that are stacked parallel to one crystal axis to strands which are arranged in a parallel fashion in I and rotated against each other in II by 110°. In both, the tetrameric [Hg(CF3)2(Pur)]4 and the dimeric [Hg(CF3)2(Dat)]2 the Hg(CF3)2 molecules are slightly bent (around 167 and 170°) and rather weakly attached to the N‐donor ligands Pur and Dat with Hg‐N distances around 272 pm, although in both cases the Hg atoms bridge between two ligand molecules.
Structural Diversity of Sheets in Rubidium Uranyl Oxoselenates: Synthesis and Crystal Structures of Rb2[(UO2)(SeO4)2(H2O)](H2O), Rb2[(UO2)2(SeO4)3(H2O)2](H2O)4, and Rb4[(UO2)3(SeO4)5(H2O)]
Authors: Krivovichev Sergey V. , Kahlenberg Volker 
Published: February 2005

AbstractSingle crystals of three rubidium uranyl selenates, Rb2[(UO2)(SeO4)2(H2O)](H2O) (1), Rb2[(UO2)2(SeO4)3(H2O)2](H2O)4 (2), and Rb4[(UO2)3(SeO4)5(H2O)] (3), have been prepared by evaporation from aqueous solutions made out of mixtures of uranyl nitrate, selenic acid and Rb2CO3. The structures of all compounds have been solved by direct methods on the basis of X‐ray diffraction data sets. The crystallographic data are as follows: (1): orthorhombic, Pna21, a = 13.677(2), b = 11.8707(13), c = 7.6397(9) Å, V = 1240.4(3) Å3, R1 = 0.045 for 2396 independent observed reflections; (2): triclinic, P1¯, a = 8.4261(12), b = 11.8636(15), c = 13.3279(18) Å, α = 102.612(10), β = 107.250(10), γ = 102.510(10)°, V = 1183.7(3) Å3, R1 = 0.067 for 4762 independent observed reflections; (3): orthorhombic, Pbnm, a = 11.3761(14), b = 15.069(2), c = 19.2089(17) Å, V = 3292.9(7) Å3, R1 = 0.075 for 3808 independent observed reflections. The structures of the phases 1, 2, and 3 are based upon uranyl selenate hydrate sheets composed from corner‐sharing pentagonal [UO7]8— bipyramids and [SeO4]2— tetrahedra. In the crystal structure of 1, the sheets have composition [(UO2)(SeO4)2(H2O)]2— and run parallel to (001). The interlayer contains Rb+ cations and additional H2O molecules. In structure of 2, the [(UO2)2(SeO4)3(H2O)2]2— sheets are oriented parallel to (101). Highly disordered Rb+ cations and H2O molecules are located between the sheets. The structure of 3 is based upon [(UO2)3(SeO4)5(H2O)]4— sheets stacked parallel to (010) and contains Rb+ cations in the interlayers. The topologies of the uranyl oxoselenate sheets observed in the structures of 1, 2, and 3 are related to the same simple and highly‐symmetric graph consisting of 3‐connected white and 6‐connected black vertices.
Chemischer Transport fester Lösungen. 17 [1] Der Chemische Transport von ZnS und CdS mit Phosphor — die Mischphase ZnS:P
Authors: Locmelis S. , Milke E. , Binnewies M. 
Published: February 2005

AbstractChemical Vapor Transport of ZnS and CdS with Phosphorus — ZnS:P mixed CrystalsThe volality of ZnS and CdS is enlarged in the presence of Phosphorus vapor. This is due to the formation of PS(g). By means of chemical vapor transport (1000 → 900 °C) using phosphorous as transport agent ZnS:P mixed crystals (sphalerit type) have been prepared. Density measurements on these mixed crystals show that interstitial zinc atoms are the consequence of the substitution of sulfur by phophorus atoms.
Synthesis and Structure Characterization of Metal‐organic Frameworks with a Triple Iron Helical Complex
Authors: Jian Fang‐Fang , Zhu Chong‐Yi , Xiao Hai‐Lian , Xu Liang‐Zhong 
Published: February 2005

AbstractMetal‐organic frameworks were achieved from triple metal helical iron complex [(Fe2L3)·(H2O)4] (L = bis[2‐hydroxybenzaldehyde]hydrazonate). The phenyl rings of the helical units contact the neighbors via π‐π and C‐H···π interactions to form two‐dimensional channeled frameworks in which four solvent water molecules are included in the channels of the structure. Thermogravimetric analyses reveal that the solvent water molecules can be evacuated from the pores without loss of the framework periodicity. The crystal lattice is thermally stable up to 339.9 °C, and water can be re‐included by putting the heated material in water.
Metal Tetrahydroborates and Tetrahydroborato Metalates. 30 [1] Solvates of Alcoholato‐, Phenolato‐, and Bis(trimethylsilyl)amido‐Magnesium Tetrahydroborates XMgBH4(Ln). Metall Tetrahydroborate und Tetrahydroborato Metallate, 30 [1]. Solvate der Alkoholato‐, Phenolato‐ und Bis(trimethylsilyl)amino‐magnesium‐tetrahydroborate XMgBH4(Ln)
Authors: Bremer Mathias , Linti Gerald , Nöth Heinrich , Thomann‐Albach Martina , Wagner Gerhardt E. W. J. 
Published: February 2005

AbstractA series of alcoholato and phenolato magnesium tetrahydroborates have been prepared as solvates (RO)Mg(BH4)(OEt2) by 1:1 reactions of ROH (R = Me, Et, iPr, tBu, CH2CMe3, Et2(tBu)C, Ph3C, Ph, 2, 4, 6‐Me3C6H2, (2, 6‐iPr)2C6H3, (2, 6‐tBu2)C6H3, 2‐(iPrO)C6H4, 2, 6‐(MeO)2C6H3) with diethyl ether solutions of EtMg(BH4). Displacement of diethyl ether by thf, dme, and diglyme produced various solvates (RO)Mg(BH4)(L)n (L = thf, dme, diglyme, n = 1, 2, 3). Most of these compounds are centrosymmetric dimers with a central Mg2O2 four membered ring. Irrespective of the composition, the 11B NMR signals are 1:4:6:4:1 quintets showing that the hydrogen atoms of the BH4 groups are magnetically equivalent. The molecular structure of eight compounds [(RO)Mg(BH4)(OEt2)]2 (R = iPr, tBu, tBuCH2, Et3C, Me3Si), [(PhO)Mg(BH4)(thf)2]2, (2, 6‐tBu2C6H3O)Mg(BH4)(thf)2, (2, 6‐tBu2C6H3O)‐Mg(BH4)(thf)(dme)) have been determined. Typical for all compounds are hexacoordinated Mg atoms. The mononuclear complexes feature bidentate BH4 groups while dinuclear species show di‐ or tridentate BH4 groups depending on the number of coordinated O atoms.Mononuclear species are obtained only for compounds with bulky R groups, e. g. 2, 6‐(tBu2)(C6H3O)Mg(BH4)(thf)2 with tridentate BH4 groups. This compound has a linear O‐C‐Mg unit. In Me2SO the compound [(2‐iPrO)C6H4O]Mg(BH4)(OEt2) underwent ligand exchange to produce [(2‐iPrO)C6H4O]2Mg(OSMe2)]2.Reaction of EtMgBH4 with a stoichiometric amount (1:1) of (Me3Si)2NH gives [((Me3Si)2N)‐Mg(BH4)(OEt2)]2, 46 with a tridentate BH4 group. Its diethyl ether molecule can be replaced by thf, dme and diglyme. Amongst these solvates the compound [(Me3Si)2N]Mg(BH4)(diglyme) is mononuclear and its structure shows a bidentate BH4 group. Compound 46 on repeated crystallization from diethyl ether is transformed into [(Me3SiO)Mg(BH4)(OEt2)]2.No compound with a BH4 group bonded to two Mg atoms has so far been found.