D. Pena et al., Synthesis of polycyclic aromatic hydrocarbons by cocyclization of arynes and dimethyl acetylenedicarboxylate (DMAD), SYNLETT, (7), 2000, pp. 1061-1063
In a study of the palladium-catalyzed cocyclization of polycyclic arynes wi
th DMAD, Pd-2(dba)(3) led selectively to cocyclization of one molecule of a
ryne and two molecules of DMAD, while Pd(PPh3)(4) induced the cocyclization
of two molecules of aryne with one molecule of DMAD. This allowed the sele
ctive preparation of several polycyclic aromatic hydrocarbons in good to ex
cellent yield.