[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH2:7]([Li])[CH2:8][CH2:9][CH3:10].[CH3:12][CH2:13][CH2:14]CCC.O1[CH2:22][CH2:21][CH2:20][CH2:19]1.O1CCC[CH2:24]1.[Cl-:28].[Cl-].[Cl-].[Cr+3:31]>O1CCCC1>[Cl-:28].[Cl-:28].[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[C:9]([C:8]1[C:7]2[C:21](=[CH:22][CH:12]=[CH:13][CH:14]=2)[CH:20]([Cr+2:31])[CH:19]=1)([CH3:24])[CH3:10]A solution of 0.54 g (0.0023 mol) of [2-1H-inden-3-yl)-1-methylethyl]pyridine in 20 ml of tetrahydrofuran was cooled to −100° C. 1.72 ml of a 15% strength n-butyllithium solution in hexane (0.0027 mol) were slowly added dropwise. After the addition was complete, the reaction mixture was stirred at −100° C. for a further 30 minutes. The mixture was subsequently allowed to warm to room temperature. After stirring for a further 1 hour, the solution was cooled to −60° C. and 1.1 g (0.0029 mol) of chromium trichloride bis(tetrahydrofuran) were added while stirring. The mixture was allowed to warm slowly to room temperature and was subsequently stirred for a further 10 hours at room temperature. The reaction mixture was then refluxed for 20 minutes and subsequently cooled to room temperature. The solid which had precipitated was filtered off, washed with diethyl ether and dried under reduced pressure. This gave 0.3 g of (3-(2-pyridyl-1-methylethyl)indenyl)chromium dichloride (37%).
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