In a reaction with the 1 : 2 condensate of cis-Ru(phen) 2 Cl 2 , benzil dihydrazone and 2-formylpyridine or 2-acetylpyridine is found to undergo an electrocyclic rearrangement to yield the cation [ Ru(phen) 2 {5,6-diphenyl-3-(pyridin-2-yl)-1,2,4which has been isolated as its hexaÑuoro-triazine} ]2', phosphate salt and characterised by X-ray crystallography.
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