Die kristall- und elektronenstruktur des methyllithiums

Weiß, Erwin; Lücken, E. A. C.

doi:10.1016/s0022-328x(00)80512-4

Cited by 227 publications

(36 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Both of the symmetry-related sodium atoms, Na(3) and Na(3'), have three intermolecular contacts in the range 2.556-2.730/k with all three H atoms attached to C(4") and C(4"')* respectively. This umbrella arrangement is similar to those in tetrameric methyllithium (Weiss & Lucken, 1964;Weiss & Hencken, 1970) and in LiBMe4 (Rhine et al, 1975). In addition these chains are weakly held by somewhat longer intermolecular interactions between Na(2) and two methyl H atoms on different molecules (3.24/k), thereby giving a loosely held two-dimensional network parallel to the ab plane.…”

supporting

confidence: 60%

Sodium–hydrogen and boron–hydrogen interactions in the cubane structure of tetrasodium tetra-μ3-hydrido-tetrakis(trimethylborate) diethyl ether solvate, [NaB(CH3)3H]4.(C2H5)2O

Bell¹,

Shearer²,

Spencer³

1983

Acta Crystallogr C

View full text Add to dashboard Cite

terpretation of the 21 K phase transition; methyl hydrogen ordering is a possibility, if the acetate ions lie on twofold axes. On the other hand, the reported variability in the magnitude of the 21 K Cp-curve peak may well be related to the variability in diffraction pattern and domain size, found by us.We thank Professor E. F. Westrum for suggesting this problem and Dr Magda E1-Fass for performing the high-temperature crystallizations.References FRANZOSINI,P., PLAUTZ, W. A. & WESTRUM, E. F. (1983 The molecule is situated on a mirror plane giving a cubane structure of Na and H atoms. The structure thus consists of two interpenetrating tetrahedra of Na and hydridic H atoms at alternate corners of the very distorted cube. One of the Na atoms which lies on the mirror plane is coordinated to an ether molecule. Each hydridic H is bonded to the B of one trimethylboron group, thus forming a larger tetrahedron of B atoms. The tetrameric units are stacked along the b direction via interactions between the two Na atoms on the mirror plane and methyl H atoms of trimethylboron units in neighbouring tetramers. These chains are loosely held together in a two-dimensional network.Introduction. Hydrides of the type MBR 3 H (M = alkali metal, R = alkyl) are readily prepared from MH and R3B (e.g. Brown & Krishnamurthy, 1978;Brown,

show abstract

supporting

confidence: 60%

Sodium–hydrogen and boron–hydrogen interactions in the cubane structure of tetrasodium tetra-μ3-hydrido-tetrakis(trimethylborate) diethyl ether solvate, [NaB(CH3)3H]4.(C2H5)2O

Bell¹,

Shearer²,

Spencer³

1983

Acta Crystallogr C

View full text Add to dashboard Cite

show abstract

“…[4b, 12,13] Due to the oligomeric nature of organolithium structures, the reactivity and solubility of organolithium compounds is considerably decreased. Deaggregation by Lewis base addition increases the solubility and can also cause a drastic increase in reactivity.…”

Section: Structure Formation Principlesmentioning

confidence: 99%

Structure Formation Principles and Reactivity of Organolithium Compounds

Gessner

Däschlein

Strohmann

2009

Chemistry A European J

241

111

View full text Add to dashboard Cite

The structure-reactivity relationship is an important feature of organolithium compounds. The knowledge of the structure of reactive species is crucial for the elucidation of reaction mechanisms and the understanding of observed selectivities. This concept article gives an overview over the structural principles of lithium organics and their Lewis base coordinated complexes in the solid state. The transition from the oligomeric parent structures to smaller adducts, such as dimers and monomers, as well as special degrees of aggregation is presented. Besides the commonly used alkyllithium compounds, a short overview over the structural principles of the higher homologous silyllithium compounds is given. Moreover, the structure-reactivity relationship is depicted by means of the reactivity of the Lewis bases towards intramolecular decomposition reactions with the organolithium compound. Selected examples confirm the importance of structure elucidation for the understanding of mechanistic pathways and selectivities.

show abstract

“…[11] Similar hetero-cubane structures have also been observed in some barium alkoxides, [14] alkyl magnesium alkoxides, [15] and metal±or-ganic compounds such as methyl lithium. [16] Each Mg atom is also coordinated to a thd ligand and a methanol group, leading to a distorted octahedron of oxygen atoms around the Mg, see Figure 2. The hydrogen atom on each methanol was located from difference maps and fully refined, allowing the identification of a short hydrogen bond to an oxygen atom of an adjacent thd ligand (1.92(5)±2.05 (6) ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Characterization of a Novel Magnesium β‐Diketonatoalkoxide Complex: A New Precursor for the MOCVD of MgO

Davies¹,

Jones²,

Leedham³

et al. 2000

Chemical Vapor Deposition

View full text Add to dashboard Cite

The tetrameric magnesium complex [Mg(thd)(m 3 -OMe)(MeOH)] 4 (thd = 2,2,6,6-tetramethylheptane-3,5-dionate), 1, has been synthesized and its structure determined by X-ray crystallography. Thin films of magnesium oxide, MgO, have been deposited by liquid-injection MOCVD using tetrahydrofuran solutions of 1. The films were deposited at substrate temperatures of between 500 and 600 C and, under optimum growth conditions, were shown by Auger electron spectroscopy to be pure magnesium oxide with no detectable carbon.

show abstract

Die kristall- und elektronenstruktur des methyllithiums

Cited by 227 publications

References 18 publications

Sodium–hydrogen and boron–hydrogen interactions in the cubane structure of tetrasodium tetra-μ3-hydrido-tetrakis(trimethylborate) diethyl ether solvate, [NaB(CH3)3H]4.(C2H5)2O

Sodium–hydrogen and boron–hydrogen interactions in the cubane structure of tetrasodium tetra-μ3-hydrido-tetrakis(trimethylborate) diethyl ether solvate, [NaB(CH3)3H]4.(C2H5)2O

Structure Formation Principles and Reactivity of Organolithium Compounds

Synthesis and Structural Characterization of a Novel Magnesium β‐Diketonatoalkoxide Complex: A New Precursor for the MOCVD of MgO

Contact Info

Product

Resources

About