468 research outputs found

    Unusual Anions [LAl(SH)(S)]<sup>-</sup> and [LAl(S)<sub>2</sub>]<sup>2-</sup> Stabilized by Weakly Coordinating Imidazolium Cations. Synthesis of LAl(SSiMe<sub>2</sub>)<sub>2</sub>O (L = HC[C(Me)N(Ar)]<sub>2</sub>, Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)

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    Deprotonation of an Al−SH moiety has been achieved easily by using N-heterocyclic carbene as the base. Monomeric mono- and bis-imidazolium salts [CtH+][LAl(SH)(S)]- ([CtH+] = N,N‘-bis-tert-butylimidazolium), [CmH+][LAl(SH)(S)]-, and [CmH+]2[LAl(S)2]2- ([CmH+] = N,N‘-bismesitylimidazolium), containing unusual anions [LAl(SH)(S)]- and [LAl(S)2]2-, have been synthesized in nearly quantitative yields. Furthermore, [CmH+]2[LAl(S)2]2- has been successfully used for the preparation of LAl(SSiMe2)2O containing the [O(Me2SiS)2]2- ligand

    Unusual Anions [LAl(SH)(S)]<sup>-</sup> and [LAl(S)<sub>2</sub>]<sup>2-</sup> Stabilized by Weakly Coordinating Imidazolium Cations. Synthesis of LAl(SSiMe<sub>2</sub>)<sub>2</sub>O (L = HC[C(Me)N(Ar)]<sub>2</sub>, Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)

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    Deprotonation of an Al−SH moiety has been achieved easily by using N-heterocyclic carbene as the base. Monomeric mono- and bis-imidazolium salts [CtH+][LAl(SH)(S)]- ([CtH+] = N,N‘-bis-tert-butylimidazolium), [CmH+][LAl(SH)(S)]-, and [CmH+]2[LAl(S)2]2- ([CmH+] = N,N‘-bismesitylimidazolium), containing unusual anions [LAl(SH)(S)]- and [LAl(S)2]2-, have been synthesized in nearly quantitative yields. Furthermore, [CmH+]2[LAl(S)2]2- has been successfully used for the preparation of LAl(SSiMe2)2O containing the [O(Me2SiS)2]2- ligand

    Unusual Anions [LAl(SH)(S)]<sup>-</sup> and [LAl(S)<sub>2</sub>]<sup>2-</sup> Stabilized by Weakly Coordinating Imidazolium Cations. Synthesis of LAl(SSiMe<sub>2</sub>)<sub>2</sub>O (L = HC[C(Me)N(Ar)]<sub>2</sub>, Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)

    No full text
    Deprotonation of an Al−SH moiety has been achieved easily by using N-heterocyclic carbene as the base. Monomeric mono- and bis-imidazolium salts [CtH+][LAl(SH)(S)]- ([CtH+] = N,N‘-bis-tert-butylimidazolium), [CmH+][LAl(SH)(S)]-, and [CmH+]2[LAl(S)2]2- ([CmH+] = N,N‘-bismesitylimidazolium), containing unusual anions [LAl(SH)(S)]- and [LAl(S)2]2-, have been synthesized in nearly quantitative yields. Furthermore, [CmH+]2[LAl(S)2]2- has been successfully used for the preparation of LAl(SSiMe2)2O containing the [O(Me2SiS)2]2- ligand

    Unusual Anions [LAl(SH)(S)]<sup>-</sup> and [LAl(S)<sub>2</sub>]<sup>2-</sup> Stabilized by Weakly Coordinating Imidazolium Cations. Synthesis of LAl(SSiMe<sub>2</sub>)<sub>2</sub>O (L = HC[C(Me)N(Ar)]<sub>2</sub>, Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)

    No full text
    Deprotonation of an Al−SH moiety has been achieved easily by using N-heterocyclic carbene as the base. Monomeric mono- and bis-imidazolium salts [CtH+][LAl(SH)(S)]- ([CtH+] = N,N‘-bis-tert-butylimidazolium), [CmH+][LAl(SH)(S)]-, and [CmH+]2[LAl(S)2]2- ([CmH+] = N,N‘-bismesitylimidazolium), containing unusual anions [LAl(SH)(S)]- and [LAl(S)2]2-, have been synthesized in nearly quantitative yields. Furthermore, [CmH+]2[LAl(S)2]2- has been successfully used for the preparation of LAl(SSiMe2)2O containing the [O(Me2SiS)2]2- ligand

    Synthesis and Structural Characterization of P-Functionalized Metallacyclophosphazenes<sup>†</sup>

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    A facile, high-yield synthesis of Cl3VNSiMe3 (1) is reported. 1 and the metal nitride halides Cl3MoN and Cl3WN react with [{(Me2N)2PNH2}2N]+Cl- to form the six-membered metallacyclophosphazenes [(Me2N)2PN]2VCl2 (2), [(Me2N)2PN]2MoCl3·MeCN (3), and [(Me2N)2PN]2WCl3·MeCN (4), respectively. The X-ray structure determinations of 2 and 3 show the compounds to have planar six-membered rings of distorted geometry

    Hydrolytic Synthesis of an Alumoxane Hydride Bearing Terminal Pyrazolato Ligands<sup>†</sup>

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    The novel alumoxane hydride [(μ-η1:η1-3,5-tBu2pz)2(η1-3,5-tBu2pz)2(μ3-O)(μ-Al)3H3]·2THF (2; 3,5-tBu2pz = 3,5-tert-butylpyrazolato) is formed when aluminum dihydride [(μ-η1:η1-3,5-tBu2pz)(μ-Al)H2]2 (1) is reacted with 1 equiv of water. The core of compound 2 consists of two tetra- and one hexacoordinated Al atoms with short Al−O bonds. The two central N2Al2O ring systems share a common Al−O edge with a hexacoordinated Al atom, and two of the pyrazolato ligands bind in an η1 and μ-η1:η1 arrangement

    Hydrostannylation of Ketones and Alkynes with LSnH [L = HC(CMeNAr)<sub>2</sub>, Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>]

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    The reactions of the stable β-diketiminate tin(II) hydride LSnH [L = HC(CMeNAr)2, Ar = 2,6-iPr2C6H3] with different ketones (Ph2CO, 2-Py2CO, cyPr2CO, and 2-C4H3SCOCF3) generated a variety of tin(II) alkoxides (1−4) in high yield. The activated terminal alkynes (HCCCO2R, R = Me, Et) react with LSnH to yield the tin(II) substituted terminal alkenes (5−6) instead of dihydrogen elimination although the Sn−H and C−H bonds are differently polarized. Furthermore, LSnH reacts with disubstituted alkyne (RO2CCCCO2R, R = Et, tBu) in toluene at room temperature to form the stannylene substituted internal alkenes (7−8). Compounds 1−8 were characterized by microanalysis and multinuclear NMR spectroscopy. Moreover compounds 3, 4, 5, and 7 were characterized by X-ray crystallography, and the resulting structures confirmed the monomeric nature, in which the tin centers reside in a trigonal-pyramidal environment

    Oxidative Addition of Ammonia at a Silicon(II) Center and an Unprecedented Hydrogenation Reaction of Compounds with Low-Valent Group 14 Elements Using Ammonia Borane

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    Oxidative Addition of Ammonia at a Silicon(II) Center and an Unprecedented Hydrogenation Reaction of Compounds with Low-Valent Group 14 Elements Using Ammonia Boran

    Synthesis and Structure of a S<sub>4</sub>Si<sub>4</sub> Cage Compound<sup>†</sup>

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    The reaction of the tetraaminodisilane R2Si2(NH2)4 (R = CH(SiMe3)2) with liquid H2S at −70 °C resulted in the formation of a R4S4Si4 cage. The core of the molecule consists of four five-membered rings. Two disilane units are bridged cross over by four sulfur atoms. This is a new structural type in the group of silicon−sulfur ring and cluster compounds

    Stannasiloxanes with Acyclic, Bicyclic, and Cubic Core Structures:  X-ray Crystal Structure of the Bicyclic Compound [RSi(OSnPh<sub>2</sub>O)<sub>3</sub>SiR] (R = (2,6-Me<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)NSiMe<sub>3</sub>)<sup>†</sup>

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    The reactions of the (arylamino)silanetriols with mono-, di-, and trifunctional alkyl/aryl tin(IV) chlorides have been investigated. Treatment of (arylamino)silanetriols RSi(OH)3 (1, 2) with Me3SnCl leads to the isolation of the acyclic stannasiloxanes RSi(OSnMe3)3 (R = (2,6-Me2C6H3)NSiMe3 (3), (2,6-i-Pr2C6H3)NSiMe3 (4)), which are potential precursors for the preparation of metallasiloxanes. The reactions between the silanetriols 1 and 2 and R‘2SnCl2 in a 2:3 molar ratio yield the bicylic stannasiloxanes [RSi(OSnR‘2O)3SiR] (R = (2,6-Me2C6H3)NSiMe3, R‘ = Me (5); R = (2,6-Me2C6H3)NSiMe3, R‘ = Ph (6); R = (2,6-i-Pr2C6H3)NSiMe3, R‘ = Me (7); R = (2,6-i-Pr2C6H3)NSiMe3, R‘ = Ph (8)). The cubic stannasiloxanes [RSiO3SnPh]4 (R = (2,6-Me2C6H3)NSiMe3 (9); (2,6-i-Pr2C6H3)NSiMe3 (10)) are easily prepared in good yields by starting from the respective silanetriols and PhSnCl3. In all the reactions NEt3 is used as the hydrogen chloride acceptor. The new stannasiloxanes 3−10 have been extensively characterized by means of their analytical data and mass, IR, and NMR (1H, 29Si and 119Sn) spectral data. The solid-state structure of the bicyclic compound 6 has been determined by X-ray diffraction studies
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