|
|||||
|
|
Formation of ferraboranes from pentaborane(9) or BH3 · thf and an electron-rich cyclopentadienyl iron phosphine hydride |
|
| Authors: | Malcolm LH Green Malcolm A Kelland |
| Institution: | a Inorganic Chemistry Laboratory, South Parks Road, Oxford University, Oxford OX1 3QR, UK b Department of Chemistry, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester M1 5GD, UK c Department of Mathematics and Natural Science, Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway |
| Abstract: | (η5-C5R5)Fe(PMe3)2H] (R = H, Me) can be made in good yields in a simple one-pot reaction between FeCl2, PMe3, C5R5H (R = H, Me) and Na/Hg in thf. Reaction of (η5-C5H5)Fe(PMe3)2H] with pentaborane(9) gives the known metallaborane (η5-C5H5)-nido-2-FeB5H10] (1) in improved yield as well as the new metallaboranes (η-C5H5)-nido-2-FeB5H8{μ-5,6-Fe(η5-C5H5)(PMe3)(μ-6,7-H)}] (2), (η-C5H5)(PMe3)-arachno-2-FeB3H8] (3), (η5-C5H5)2-capped-nido-2,3-Fe2B4H8] (4), (η5-C5H5)-nido-2-FeB4H7(PMe3)] (5) and (η5-C5H5)-nido-2-FeB5H8(PMe3)] (6). Reaction of (η5-C5Me5)Fe(PMe3)2H] with pentaborane(9) gives predominantly (η5-C5Me5)-nido-2-FeB5H10] (7) and (η5-C5Me5)(PMe3)-arachno-2-FeB3H8] (8). Reaction of (η5-C5H5)Fe(PMe3)2H] with 2 equiv. of BH3 · thf gives low yields of ferrocene and compound 3. Compound 7 thermally isomerises to the apical isomer (η5-C5H5)-nido-2-FeB5H10] (9) in low yield. Compounds 1 and 7 deprotonate cleanly in the presence of KH at the unique B-H-B bridge to give (η5-C5H5)-nido-2-FeB5H9−]K+] (10) and (η5-C5Me5)-nido-2-FeB5H9−]K+] (11) respectively, whilst 6 deprotonates more slowly at one of two equivalent B-H-B bridges to give the fluxional anion (η5-C5H5)-nido-2-FeB5H7(PMe3)−] (12). |
| Keywords: | Boron hydrides Metallaboranes Borane clusters Iron Phosphine hydrides NMR spectroscopy |
| 本文献已被 ScienceDirect 等数据库收录！ | |