A new oxapalladacycle generated via ortho C–H activation of phenylphosphinic acid: an efficient catalyst for Markovnikov-type additions of E–H bonds to alkynes
作者:Qing Xu、Ruwei Shen、Yutaka Ono、Ritsuko Nagahata、Shigeru Shimada、Midori Goto、Li-Biao Han
DOI:10.1039/c0cc03436c
日期:——
A new oxapalladacycle 3 can be conveniently prepared via direct ortho palladation of diphenylphosphinic acid with palladium acetate. Catalysts derived from 3 can efficiently catalyze Markovnikov-type additions of EâH bonds (P(O)âH, SâH and spCâH) to alkynesvia a unique catalytic cycle.
Herein, we report a straightforward three-component synthesis of novel dioxaphosphorane-fused diphosphacycles with distinctive photophysical properties. Based on their unique structure and properties, a novel fluorescent switch for pH sensing was revealed by a dynamic ring-opening/ring-closing mechanism.