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Isolable Diaminophosphide Boranes
Author(s) -
Blum Markus,
Dunaj Tobias,
Knöller Julius A.,
Feil Christoph M.,
Nieger Martin,
Gudat Dietrich
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002296
Subject(s) - boranes , borane , chemistry , metalation , aryl , medicinal chemistry , phosphine , nuclear magnetic resonance spectroscopy , alkali metal , alkyl , ammonia borane , organic chemistry , boron , catalysis , hydrogen production
Metalation of secondary diaminophosphine boranes by alkali metal amides provides a robust and selective access route to a range of metal diaminophosphide boranes M[(R 2 N) 2 P(BH 3 )] (M=Li, Na, K; R=alkyl, aryl) with acyclic or heterocyclic molecular backbones, whereas reduction of a chlorodiaminophosphine borane gave less satisfactory results. The metalated species were characterized in situ by NMR spectroscopy and in two cases isolated as crystalline solids. Single‐crystal XRD studies revealed the presence of salt‐like structures with strongly interacting ions. Synthetic applications of K[(R 2 N) 2 P(BH 3 )] were studied in reactions with a 1,2‐dichlorodisilane and CS 2 , which afforded either mono‐ or difunctional phosphine boranes with a rare combination of electronegative amino and electropositive functional disilanyl groups on phosphorus, or a phosphinodithioformate. Spectroscopic studies gave a first hint that removal of the borane fragment may be feasible.