Hydrocarbures arylaliphatiques. Synthèse et aromatisation des cétones β,γ éthyléniques à squelette benzo[c]phénanthrénique

Synthesis of chrysenes and other a-fused phenanthrenes by a palladium(0) coupling—electrocyclic ring closure sequence

“…( f ) (g) 1 l- 7,11,12,t 5,7,15, (17) hj. Flash Vucuirni Pj~rolj-sis of the Ketone (5a).-The trienone (Sa) (85 mg, 0.34 mmol) was distilled at 0.03 mmHg during 1.5 h through a tube heated at 750 "C. The pyrolysate was collected o n a cooled surface at the exit of the tube.…”