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• W1998605842 abstract "The dimethylaminomethyl compounds (Me2AlCH2NMe2)2 (1), (Me2GaCH2NMe2)2 (2), (Me2InCH2NMe2)2 (3), (Me2AlCH2NMe2)·(MeClAlCH2NMe2) (4), [ClAl(CH2NMe2)2]2 (5), and [Al(CH2NMe2)3]2 (6) have been prepared by reacting LiCH2NMe2 with the corresponding element or organoelement chlorides. Characterization was undertaken by means of elemental analyses, NMR spectroscopy (1H, 13C, 27Al), and mass spectrometry. An unusually low 27Al NMR chemical shift of 6 (62 ppm) was observed indicating a possible coordination number higher than four at aluminum in solution. The crystal structures of all compounds but 3 have been determined and confirm that all form dimers with six-membered M2C2N2 rings in the chair conformation. The mass spectra indicate that the dimers are retained in the gas phase, and for 1 the molecular dynamics of ring inversion was monitored in solution by variable-temperature NMR spectroscopy, showing that the barrier for the inversion process (9 kcal mol-1) is comparable to that of cyclohexane. Calculations at the B3LYP/6-311G(d) level of theory confirm that the molecular structures of 1 and 2 are almost undistorted in the solid state. DFT calculations (B3LYP/6-311G(d)) for the monomeric three-membered ring isomers of 1 and 2 show these to be much higher in energy (81 and 77 kJ mol-1 per monomer) than the corresponding six-membered ring dimers." @default.
• W1998605842 created "2016-06-24" @default.
• W1998605842 creator A5040458333 @default.
• W1998605842 creator A5080909649 @default.
• W1998605842 date "2002-12-20" @default.
• W1998605842 modified "2023-10-18" @default.
• W1998605842 title "Molecularly Simple Dimethylaminomethyl Compounds of Aluminum, Gallium, and Indium" @default.
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• W1998605842 doi "https://doi.org/10.1021/om020687r" @default.
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