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'Cyclic Phosphine Boranes' in keywords Facet   Publication Year 1993  [X]
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1Author    Gerhard Müller, Joachim LachmannRequires cookie*
 Title    Sterisch belastete cyclische Phosphanborane Sterically Crowded Cyclic Phosphine-Boranes  
 Abstract    A The anionic phosphine o-(diphenylphosphinomethyl)phenyl L has been used to prepare the sterically crowded cyclic phosphine-boranes BL3, 'BuBL2, and 'Bu2BL by reaction o f the lith-iated ligand LiL with B(OM e)3, 'BuB(OM e)2, and 'Bu2BOMe, respectively. In the new com ­ pounds 'BuBL-, and 'Bu^BL one ligand L is bonded to the boron center by both its carbanionic and its phosptiino function with formation o f five-membered rings. In solution 11B and 31P N M R spectroscopy does not indicate substantial B -P dissociation, i.e., the existence o f three-coordinate boron. The steric bulk o f L in BL3 leads to the formation o f oligom ers in solution, presumably by a bridging coordination mode o f L to two boron centers. N o conclusive evi­ dence as to the monom eric or oligomeric nature o f BL3 in the solid state can be given, however. Five-membered ring form ation is proven for the solid state by X-ray structure determinations o f 'BuBL2 and 'Bu2BL which in addition confirm that the steric bulk o f L is superior to that o f a tert. butyl group. 
  Reference    Z. Naturforsch. 48b, 1248 (1993); eingegangen am 13. Mai 1993 
  Published    1993 
  Keywords    nionic Benzylphosphines, Cyclic Phosphine-Boranes, Crystal Structure, Steric Hindrance 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1248.pdf 
 Identifier    ZNB-1993-48b-1248 
 Volume    48