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Bis(4-benzhydryl-benzoxazol-2-yl)methane - from a Bulky NacNac Alternative to a Trianion in Alkali Metal Complexes.

ABSTRACT: A novel sterically demanding bis(4-benzhydryl-benzoxazol-2-yl)methane ligand 6 (4-BzhH2 BoxCH2 ) was gained in a straightforward six-step synthesis. Starting from this ligand monomeric [M(4-BzhH2 BoxCH)] (M=Na (7), K (81 )) and dimeric [{M(4-BzhH2 BoxCH)}2 ] (M=K (82 ), Rb (9), Cs (10)) alkali metal complexes were synthesised by deprotonation. Abstraction of the potassium ion of 8 by reaction with 18-crown-6 resulted in the solvent separated ion pair [{(THF)2 K@(18-crown-6)}{bis(4-benzhydryl-benzoxazol-2-yl)methanide}] (11), including the energetically favoured monoanionic (E,E)-(4-BzhH2 BoxCH) ligand. Further reaction of 4-BzhH2 BoxCH2 with three equivalents KH and two equivalents 18-crown-6 yielded polymeric [{(THF)2 K@(18-crown-6)}{K@(18-crown-6)K(4-Bzh BoxCH)}]n (n→∞) (12) containing a trianionic ligand. The neutral ligand and herein reported alkali complexes were characterised by single X-ray analyses identifying the latter as a promising precursor for low-valent main group complexes.

SUBMITTER: Kretsch J 

PROVIDER: S-EPMC8361911 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Bis(4-benzhydryl-benzoxazol-2-yl)methane - from a Bulky NacNac Alternative to a Trianion in Alkali Metal Complexes.

Kretsch Johannes J   Kreyenschmidt Anne-Kathrin AK   Schillmöller Timo T   Lõkov Märt M   Herbst-Irmer Regine R   Leito Ivo I   Stalke Dietmar D  

Chemistry (Weinheim an der Bergstrasse, Germany) 20210525 38

A novel sterically demanding bis(4-benzhydryl-benzoxazol-2-yl)methane ligand 6 (<sup>4-BzhH2</sup> BoxCH<sub>2</sub> ) was gained in a straightforward six-step synthesis. Starting from this ligand monomeric [M(<sup>4-BzhH2</sup> BoxCH)] (M=Na (7), K (8<sub>1</sub> )) and dimeric [{M(<sup>4-BzhH2</sup> BoxCH)}<sub>2</sub> ] (M=K (8<sub>2</sub> ), Rb (9), Cs (10)) alkali metal complexes were synthesised by deprotonation. Abstraction of the potassium ion of 8 by reaction with 18-crown-6 resulted in  ...[more]

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