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. 2019 Oct 31;24(21):3951. doi: 10.3390/molecules24213951

Figure 9.

Figure 9

The preparation of 2,2′-bipyridine by the reaction of pyridine with FeCl3 at elevated temperatures provided a convenient access to the ligand in 52% yield, although the work-up was sometimes challenging because of the large amounts of metal salts [77].