The crystal structure of trimethyl(quinuclidine)aluminum

Whitt, Carlton D.; Parker, L. M.; Atwood, Jerry L.

doi:10.1016/s0022-328x(00)82638-8

Cited by 25 publications

(6 citation statements)

References 11 publications

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“…The Al-C distances of 1-4 (Table 6) are in the range of 2.004-2.033 A for the organic derivatives and 1.966 to 1.993 Á for those containing a chlorine atom and are typical of Al-C single bond lengths for a variety of organoaluminum compounds as noted earlier.3 •21 The average Al-Cl bond length in 3, 2.206 Á, is longer by ~0.05 Á than that of MesAlCL'THF21 and ~0.05 A longer than the bond in A1C13*2THF22 but is within the range expected for single Al-Cl bonds. The Al-N distance in 1 (2.045(8) Á) is similar to the Al-N distance in MegAl-quinuclidine (2.06(1) Á), 23 The Al-0 distances in 2 and 3 are 1.934(4) and 1.894-(5) Á (av) and are listed, along with Al-O distances for other adducts, in Table 7. The Al-0 bond distances listed fall into three groups: those associated with trialkyl addition compounds with Al-0 bond distances greater than 2.0 Á, those with aryl groups bound to aluminum which fall in the broad range of 1.9-1.97 Á and those with a halogen atom bound to aluminum with Al-0 distances less than 1.9 Á.…”

Section: Resultsmentioning

confidence: 66%

Structural Studies on Mesitylaluminum Addition Compounds

Lalama¹,

Kampf²,

Dick³

et al. 1995

Organometallics

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Four mesitylaluminum derivatives, Mes&(4-picoline)(C,H&5 (11, E t M e s a T H F (21, Mesz-CM-THF (31, and [Mes~Al(p-Cl)lz (4) (Mes = 2,4,64rimethylphenyl), have been prepared and their structures determined by single crystal X-ray diffraction methods. Compound 1 crystallizes in the monoclinic space group C2/c (No. 15): a = 43.784(15) A, b = 8.901(1) A, c = 16.760(2) A, p = 104.02(2)", 2 = 8, R = 10, and R, = 9.9. Compound 2 crystallizes in the orthorhombic space group P212121 (No. 19): a = 12.057(9) A, b = 13.490(3) A, c = 14.037-(2) A, 2 = 4, R = 5.4, and R, = 3.9. The halide derivative 3 crystallizes in the primitive monoclinic space group P21h (No. 14): a = 17.18(1) A, b = 14.754(2) A, c = 17.316(2) A, , 8 = 92.74(3)", 2 = 8, R = 6.5, and R, = 2.4. The base-free compound 4 exists as a dimer and crystallizes in the space group P21h (No. 14): a = 12.288(2) A, b = 15.824 (3) A, c = 9.095(2) A, / 3 = 108.43(2)", 2 = 4, R = 5.4, and R, = 5.9. The distortion associated with 1, 2, and 3 relative to the parent monomeric molecule, M e s a , is discussed with respect to substitution of the mesityl group for the C1 and E t ligands.

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Section: Resultsmentioning

confidence: 66%

Structural Studies on Mesitylaluminum Addition Compounds

Lalama¹,

Kampf²,

Dick³

et al. 1995

Organometallics

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“…small distortions in its geometry with respect to literature data on 1-azabicyclo-2,2,2-octane moiety [13][14][15][16][17][18] caused by the substitutions at positions 2 and 3 of the bicyclic system. In both cases sp 2 carbon atoms replace sp 3 carbon atoms.…”

Section: Resultsmentioning

confidence: 57%

Solid-state structure and conformation of (Z)-2-(phenylbenzylidene)-3-quinuclidinone, an intermediate in the synthesis of quinuclidine derivatives

Santini¹,

Pedone

Benedetti

et al. 1994

Struct Chem

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(Z)-2-(2-phenylbenzylidene)-3-quinuclidinone, C2oHI9NO, Mr = 300.47D crystallizes in the monoclinic P21/c space group with a = 6.9809(2) /k, b = 19.0523(2) ik, c = 11.7733(1) ~k, = 100.92(2) ~ V = 1537.5(3) ~3, Z = 4, Dc = 1.298 g/cm 3, D~ = 1.29 g/cm 3 (flotation). Diffractometfic data, using CuKa radiation, X = 1.54178 A, were collected on plate-like crystals. The structure, solved by direct methods was refined to a final R value of 0.037 for the 2645 observed reflections with Fo > 3.0a(Fo). The molecule shows a trans conformation around the double bond. The quinuclidine and the diphenyl moieties present deformations in their geometric and conformational parameters due to the need of releasing intramolecular strains and/or nonbonded interactions.

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“…10 All the above Ga᎐Te distances are significantly shorter than those in Ga 2 Te 5 , 2.62 Å (mean). 39 The Al᎐N distance in [Al(SePh) 3 (NMe 3 )], 2.00(2) Å, is similar to that in the tellurium analogue, 2.018(5) Å, 9 both of which are within the range typical for four-co-ordinate, monotertiary amine adducts of aluminium species bearing strongly electron withdrawing or electron releasing substituents attached to the aluminium centres, 41, 42 and also with Al᎐N distances in…”

Section: Mononuclear Tris(chalcogenolato)-aluminium(iii) and -Gallium...mentioning

confidence: 58%