Chiral, Enantiopure Aluminum(III) and Titanium(IV) Azatranes

Abstract

AlIII and TiIV complexes of C3‐symmetric tetradentate trisamidoamine ligands with trigonal bipyramidal coordination geometry, containing chlorine or dialkylamido groups, or with a free coordination site in the apical position, have been synthesised by salt metathesis and amine elimination. Products with threefold symmetry were generally obtained for tetravalent titanium, whereas for the aluminium complexes either asymmetric structures with two of the three podand arms taking part in coordination to the metal or symmetric arrangements possessing the full threefold symmetry were formed depending on the steric properties of the ligands. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Group 13 and Lanthanide Complexes Supported by Tridentate Tripodal Triamine Ligands: Structural Diversity and Polymerization Catalysis

“…Ligand Elimination Route. Verkade 7 and Gade have shown that reactions of the neutral tetradentate tripodal tris(2-aminoethyl)amine ligand N[N 3 ]H 3 with AlR 3 (R = Me, NMe 2 ) readily generate the corresponding complete alkane or amine elimination productsaluminum azatranes. On the other hand, we found that reactions between the tridentate tripodal triamine ligand [N 3 ]H 3 and AlMe 3 show complexity .…”

Boron, aluminium, gallium, indium and thallium

“…125 Aluminate materials returned to topicality recently. Alumatrane once again found interest for reasons of chirality, 126 or for reasons of coordination protection 127 or for reasons of its use as a precursor, this time to nickel aluminate 128 NiAl 2 O 4 catalyst. The Sr analogue SrAl 2 O 4 was manufactured in nanotube form, through an interesting process of scrolling and high-temperature annealing.…”

“…The case where R = Me, R 0 = tos has been characterised structurally and found to be 5-coordinate due to additional coordination from a tosylate oxygen. 126 Annu. Rep…”

Modular multidentate phosphine ligands: application to palladium-catalyzed allylic alkylations

“…Thus, C 3 -symmetric 3 amines can be prepared from ammonia, 4,5 whereas compounds with C 2 and C 1 symmetry are obtained from primary and secondary amines, respectively. 6 The multidentate product amines can be employed directly as chiral nitrogen ligands 7 or the amino groups can serve as attachment points for suitable achiral or chiral donor functions, thus providing access to various types of multidentate ligands.…”