| | 1 | Author
| Gerhard Müller, Joachim Lachmann | Requires 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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| default:Reihe_B/48/ZNB-1993-48b-1248.pdf | | | | Identifier
| ZNB-1993-48b-1248 | | | | Volume
| 48 | |
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