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Reactivity of OsH2(η2-CH2=CHEt)(CO)(PiPr3)2 with catecholborane: Formation of σ-borane and boryl-dihydridoborate derivatives and catalytic dehydrogenation of amine-boranes

AutorEsteruelas, Miguel A. ; López, Ana M. ; Mora, Malka ; Oñate, Enrique
Fecha de publicación2014
CitaciónVII International School on Organometallic Chemistry “Marcial Moreno Mañas” (2014)
ResumenThe reactions of transition metal complexes with boranes is a field of much current interest for their implications in the functionalization of organic molecules and because of their applications in the preparation of new oligomers and polymers and the reversible dehydrocoupling of amine-boranes and related compounds. We have recently studied the reactivity of different osmium compounds with boranes and we have obtained a variety of species such as boryl, σ-borane, borylvinilidene, borylthiolate and hydrogenaminothioborate osmium complexes.3 In this work, we show the reactivity of complex OsH2(η2-CH2=CHEt)(CO)(PiPr3)2 with catecholborane (HBcat), which initially gives the σ-borane compound OsH2(η2-H–Bcat)(CO)(PiPr3)2. This species reacts with another catecholborane molecule to yield the boryl-dihydridocatecholborate derivative Os(Bcat)(κ2-H2Bcat)(CO)(PiPr3)2. This process is reversible. Complex Os(Bcat)(κ2-H2Bcat)(CO)(PiPr3)2 exchanges HBcat by BH3·THF to afford the tetrahydridoborate compound Os(Bcat)(κ2-H2BH2)(CO)(PiPr3)2. Complex OsH2(η2-CH2=CHEt)(CO)(PiPr3)2 also promotes the catalytic dehydrogenation of ammonia-borane and dimethylamineborane, with turnover frequency values at 50% conversion (TOF50%) of 38 and 43 h(-1), respectively.
DescripciónTrabajo presentado al VII International School on Organometallic Chemistry “Marcial Moreno Mañas” celebrado en el Campus of the Universitat Autònoma de Barcelona (UAB) del 25 al 27 de junio de 2014.
URIhttp://hdl.handle.net/10261/112272
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