Bis-(triphenylphosphane) Aluminum Hydride: A Simple Way to Provide, Store, and Use Non-Polymerized Alane for Synthesis.

Autor: Anders M; Department of Physical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Schwarzer A; Department of Organic Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Brendler E; Department of Analytical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Pollex R; Department of Organic Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Schumann E; Department of Physical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Sandig-Predzymirska L; Department of Physical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Kaiser S; Department of Physical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany., Mertens F; Department of Physical Chemistry, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany.
Jazyk: angličtina
Zdroj: ChemPlusChem [Chempluschem] 2021 Aug 10; Vol. 86 (8), pp. 1193-1198. Date of Electronic Publication: 2021 Aug 10.
DOI: 10.1002/cplu.202100287
Abstrakt: AlH 3 (PPh 3 ) 2 was synthesized as a stable solid being the first known 1 : 2 alane arylphosphane adduct. Although only weakly intra-molecularly coordinated, it displays as a molecular crystal significant inertness against atmospheric humidity and oxygen due to strong steric screening of the alane unit. The compound readily dissociates PPh 3 in solution allowing for its use as a Lewis acidic reducing agent. These features lead to an easy to store, easy to use reducing agent that may enable the quantitative investigation of aluminum hydride chemistry including reduction, complexation and hydroalumination reactions. The structure contains two non-equivalent penta-coordinated aluminum centers that despite long Al-P distances of ca. 2.7 Å display unusually high quadrupolar coupling constants C Q of 25.1 and 26.5 in 27 Al solid state NMR measurements. The product was also tested as a reducing agent on a small set of selected compounds with various functional groups.
(© 2021 The Authors. ChemPlusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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