Facile Syntheses of 1,8-Bis(diphenylphosphino)anthracene and 1,8-Bis(dimethylamino)anthracene by Nucleophilic Substitution of 1,8-Difluoroanthracene - Haenel, Matthias W; Oevers, Stephan; Bruckmann, Joachim; Kuhnigk, Jörg; Krüger, Carl (Synlett, 1998)