Base-Mediated Cyclization Reaction of 2-Alkynylphenylphosphine Oxides: Synthesis and Photophysical Properties of Benzo[b]phosphole Oxides
摘要:
The base-mediated intramolecular cyclization reaction of 2-alkynylphenylphosphine oxides affords benzo[b]phosphole oxides, which show intense blue-green fluorescence. Benzo[b]phospholes are also prepared by the reduction of benzo[b]phosphole oxides.
Comparison of 2-Arylnaphtho[2,3-<i>b</i>]phospholes and 2-Arylbenzo[<i>b</i>]phospholes: Effects of 2-Aryl Groups and Fused Arene Moieties on Their Optical and Photophysical Properties
Suzuki-Miyaura cross-coupling reactions were used in the divergent synthesis of a series of 2-arylnaphtho[2,3-b]phosphole P-oxides and their benzo[b]phosphole counterparts. We elucidated the electronic and steric effects of the 2-aryl groups and fused arene moieties on the optical and photophysical properties of these two types of phosphole-based pi-systems.