title: An unusually unstable ortho-phosphinophenol and its use to prepare benzoxaphospholes having enhanced air-stability.
abstract: The primary phosphine 3,5-di-tert-butyl-2-phosphinophenol has been prepared and characterized. Oddly, the presence of a sterically demanding tert-butyl group adjacent to the PH2 centre renders the molecule very sensitive to loss of PH3 and formation of 3,5-di-tert-butyl-phenol in chloroform solutions in the presence of air. The process was catalyzed by HCl and dependent on the purity of CDCl3. Despite the instability of 3,5-di-tert-butyl-2-phosphinophenol, this material could be employed to produce a series of luminescent 2-R-4,6-di-tert-butyl-1,3-benzoxaphospholes having greater air stability than corresponding less bulky 2-R-1,3-benzoxaphospholes.
authors.affiliation: Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA. protasiewicz@case.edu.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Wu
authors.forename: Nihal
authors.initials: N
authors.lastname: Deligonal
authors.forename: John D
authors.initials: JD
authors.lastname: Protasiewicz