Download e-book for kindle: Organic Syntheses Volume 69 by Leo Paquette

By Leo Paquette

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Additional info for Organic Syntheses Volume 69

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Structural organomagnesium chemistry 35 FIGURE 44. Molecular geometry of 78 in the solid state FIGURE 45. Molecular geometries of 79 and 80 in the solid state ˚ are (Figure 46)117 . 154(4) A] as expected for aryl groups σ -bonded to magnesium. All four oxygen atoms of the crown are involved in intramolecular coordination with Mg−O bond distances ranging from ˚ leading to a six-coordinate magnesium atom. 619(3) A, tert-butylphenyl)magnesio]-1,3-xylene-18-crown-5 (82) has been prepared and structurally characterized in the solid state (Figure 46)118 .

Molecular geometry of 83 in the solid state Bis[1,3-bis{(dimethylphosphino)methyl}phenyl]magnesium (83) is the only example of a diorganomagnesium compound in which phosphorus to magnesium coordination in the solid state is established unambiguously by X-ray crystallography. 216(1) A] ˚ (Figure 47)119 .

An X-ray crystal-structure determination of 14 revealed a molecular geometry in which the triarylmagnesiate and lithium are associated via bridging aryl groups (Figure 15)58 . Both the magnesium atom and the lithium atom in 14 are three-coordinate, the magnesium atom as the result of the bonding of two bridging and one terminal carbon atom, and the lithium atom as the result of the bonding of two bridging carbon atoms and an oxygen atom of an additional coordinating THF molecule. The sum of the bond angles around both the magnesium atom and the lithium atom is close to 360◦ , indicating for both metals a trigonal planar coordination geometry.

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Organic Syntheses Volume 69 by Leo Paquette

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