• Dimetallated derivatives react with electrophiles preferentially at the terminal position; e.g. arylation by 2-chloroquinoline: J. Org. Chem., 37, 3199 (1972); J. Am. Chem. Soc., 97, 374 (1975). Reaction with aromatic esters gives 1,3-diaryl-1,3,5-pentanetriones, which can be cyclized with acid to -pyrones: Org. Synth. Coll., 5, 718, 721 (1973):