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Aluminum(III) Halide Complexes based on a Bis‐(benzoxazol‐2‐yl)methane Ligand
Author(s) -
Kretsch Johannes,
HerbstIrmer Regine,
Stalke Dietmar
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800092
Subject(s) - triclinic crystal system , chemistry , monoclinic crystal system , halide , ligand (biochemistry) , crystallography , crystal structure , metal , medicinal chemistry , inorganic chemistry , organic chemistry , biochemistry , receptor
Low‐valent aluminum(I) heterocycles that are specified as metal carbenes can be applied as catalysts and in small molecule activation. Thus, the synthesis of new types of metal carbenes is a rewarding task we set out to contribute. The reactive aluminum compounds should be obtained by reduction of an aluminum(III) halide precursor coordinated to a suitable ligand. The bis(benzoxazol‐2‐yl)methanide ligand HCBOX 2 (BOX = benzoxazol‐2‐yl) mimics the beneficial features of the omni‐present nacnac ligand. Two new aluminum halide complexes [(HCBOX 2 )Al X 2 ] ( X = Cl, I) were synthesized in a salt elimination reaction with the corresponding metal halide and the lithiated ligand [(HCBOX 2 )Li(Et 2 O) 2 ], derived from H 2 CBOX 2 [bis‐(benzoxazol‐2‐yl)methane]. The complexes [(HCBOX 2 )AlCl 2 ] ( 1 ) and [(HCBOX 2 )AlI 2 ] ( 2 ) were characterized by NMR spectroscopy from solution, mass spectrometry and single‐crystal X‐ray diffraction. 1 crystallizes in the monoclinic space group P 2 1 / n and crystals of complex 2 were obtained in the triclinic crystal system with space group P 1 . Especially [(HCBOX 2 )AlI 2 ] ( 2 ) is a promising precursor for the synthesis of new low‐valent aluminum(I) compounds because especially the Al–I bond is prone to reduction.