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Reactions of small boranes with ruthenium phosphine hydrides: Oligomerisation of monoborane-tetrahydrofuran to a nido-hexaruthenaborane |
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| Authors: | Malcolm LH Green Malcolm A Kelland |
| Institution: | a Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, UK b Department of Chemistry, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester M1 5GD, UK c Department of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway |
| Abstract: | Reaction of Ru(PPh3)4H2] with BH3 · thf at room temperature gives borane oligomerisation with the formation of the 6-vertex metallaborane nido-2-Ru(PPh3)2(H)B5H10] (1). This cluster is also formed by reaction of Ru(PPh3)4H2] with nido-B5H9. Compound (1) is readily deprotonated by KH in thf at the unique basal B-H-B bridge to give  (2). In contrast to Ru(PPh3)4H2] reaction of cis-Ru(PMe3)4H2] with BH3 · thf gives initially the known borohydride Ru(PMe3)3(H)(η2-BH4)] which reacts with excess BH3 · thf to give the 5-vertex metallaborane nido-2-Ru(PMe3)3B4H8] (3). Reaction of cis-Ru(PMe3)4H2] with nido-B5H9 also gives (3) and nido-2-Ru(PMe3)3B9H13] (4). cis-Ru(PMe3)4H2] is conveniently prepared in high yield in a one-pot synthesis by the sodium amalgam reduction of RuCl3 · 3H2O in thf with excess PMe3 under dinitrogen. |
| Keywords: | Metallaboranes Ruthenaboranes Ruthenium Phosphine hydrides Boranes |
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