[C-:1]1([C:6]([OH:8])=O)[CH:5]=[CH:4][CH:3]=[CH:2]1.[CH-:9]1[CH:13]=[CH:12][CH:11]=[CH:10]1.[Fe+2:14].CN(C=O)C.C(Cl)(=O)C([Cl:23])=O>C1(C)C=CC=CC=1>[C-:1]1([C:6]([Cl:23])=[O:8])[CH:5]=[CH:4][CH:3]=[CH:2]1.[CH-:9]1[CH:13]=[CH:12][CH:11]=[CH:10]1.[Fe+2:14]Ferrocene carboxylic acid (5.0 g, 21.7 mmol) was suspended in 40 mL of toluene containing a catalytic amount of DMF; oxalyl chloride (3.08 g, 24 mmol) was added dropwise (approx. addition time 30 min.). The resulting mixture was stirred at room temperature for 3 hours, filtered and the resulting solution used as such in Examples 3,4 and 5.
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