[BH4-].[Na+].[CH2:3]([C:5]1([Li])[CH:9]=[CH:8][CH:7]=[CH:6]1)[CH3:4].[CH2:11]([C:13]1[CH2:17][CH:16]=[CH:15][CH:14]=1)[CH3:12].C([Li])CCC.[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Ta+5:28]>C1COCC1>[CH2:3]([C:5]1([TaH3:28][C:13]2([CH2:11][CH3:12])[CH:17]=[CH:16][CH:15]=[CH:14]2)[CH:9]=[CH:8][CH:7]=[CH:6]1)[CH3:4]6.85 g (181 mmol) of sodium borohydride and 40 ml of THF were added to a solution of 48.9 g (489 mmol) of ethylcyclopentadienyl lithium prepared from ethylcyclopentadiene and butyl lithium in THF (200 ml), followed by ice-cooling. 24.9 g (69 mmol) of tantalum pentachloride was added to the mixture, followed by refluxing for 4 hours. The solvent was distilled away in vacuo, and the residue was sublimated at 2.5 Pa/100° C. to obtain 8.80 g (yield: 34.2%) of a white solid.
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