The reaction of [Cp*FeH 2 ] 2 (Cp* ) η 5 -C 5 Me 5 ) with BH 3 ‚THF under mild conditions produces the new arachno-ferraborane 1-Cp*FeB 4 H 11 via a boraallyl intermediate. Reaction of 1-Cp*FeB 4 H 11 with Co 2 (CO) 8 yields the novel nido-dimetallahexaborane 1,2-(Cp*Fe)-{Co(CO) 3 }B 4 H 8 , which has been characterized by an X-ray diffraction structure determination.
The reactions of [Cp*MH 2 ] 2 , Cp* ) η 5 -C 5 Me 5 ; M ) Fe, Ru, with BH 3 ‚THF have been explored. As with [Cp*RuCl 2 ] 2 , [Cp*RuH 2 ] 2 readily reacts with borane to generate nido-1,2-(Cp*RuH) 2 B 3 H 7 . In contrast to the chloride, intermediates are detectible in the hydride reaction and product selectivity is higher. Benefits of the apparently lower reaction barrier appear in the reaction of [Cp*FeH 2 ] 2 with BH 3 ‚THF. The formation and isolation of the novel hydrogen-rich ferraborane arachno-1-Cp*FeB 4 H 11 from the iron hydride contrasts with the production of pentamethylferrocene from a pentamethylcyclopentadienyl iron halide. This metastable ferraborane has been characterized spectroscopically as well as by reaction with Co 2 (CO) 8 to give a good yield of the more stable derivative nido-1-(Cp*Fe)-2-{Co(CO) 3 }B 4 H 8 by metal fragment addition. The latter compound has been spectroscopically characterized in solution as well as in the solid state by a single-crystal X-ray diffraction study as an example of a mixed metal dimetallahexaborane.
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