105-106" C) in 51 and 38%, respectively. Not surprisingly, attempted reactions with isopropyl and tert-butyl halides afforded only anthracene itself after aqueous workup. Quenching of 9, lO-dilithioanthracene with CO, has been reported previously to provide the corresponding dicarboxylic acid., Conversion to the diacid chloride with SOCl, and workup with methanol afforded 9, lO-dicarbomethoxyanthracene (2c), made previously by ...
[Tolbert, Laren M.; Khanna, Rajive K.; Popp, Ann E.; Gelbaum, Leslie; Bottomley, Lawrence A. Journal of the American Chemical Society, 1990 , vol. 112, # 6 p. 2373 - 2378]