Metal-free catalytic hydrogenation of enamines, imines, and conjugated phosphinoalkenylboranes
(Chemical Equation Presented) The metal-free hydrogen activator 1 catalyzes the unique P/B hydrogenation of the frustrated Lewis pair 3, which itself is inactive toward H2 under the applied conditions, to yield the hydrogenation product 4. System 1/2 (5 mol%) also catalyzes the hydrogenation of a bulky ketimine and of enamines under mild conditions (2.5 bar H2, RT) to yield the respective amines.
Spies, Patrick,Schwendemann, Sina,Lange, Stefanie,Kehr, Gerald,Froehlich, Roland,Erker, Gerhard
supporting information; experimental part
p. 7543 - 7546
(2009/03/12)
Rapid intramolecular heterolytic dihydrogen activation by a four-membered heterocyclic phosphane-borane adduct
A four-membered cyclic intramolecular phosphane-borane adduct activates dihydrogen to yield the respective ethylene-bridged zwitterionic phosphonium-hydridoborate system, which reduces benzaldehyde. The Royal Society of Chemistry.
Spies, Patrick,Erker, Gerhard,Kehr, Gerald,Bergander, Klaus,Froehlich, Roland,Grimme, Stefan,Stephan, Douglas W.
p. 5072 - 5074
(2008/09/17)
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