title: Fused bispentacenequinone and its unexpected Michael addition.
abstract: Fused bispentacenequinone 2 was synthesized by photocyclization of bispentacenequinone 1. Unusual regioselective Michael addition was observed for 2 when excess aryl Grignard reagent was used. Subsequent acidification and oxidation in air gave diaryl-substituted bispentacenequinone 3. Tetra-aryl-substituted fused bispentacenequinone 4 was obtained from 3 after the second Michael addition followed by oxidation in air.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Zhang
authors.forename: Jinling
authors.initials: J
authors.lastname: Li
authors.forename: Hemi
authors.initials: H
authors.lastname: Qu
authors.forename: Chunyan
authors.initials: C
authors.lastname: Chi
authors.forename: Jishan
authors.initials: J
authors.lastname: Wu