Oxide, Sulfide, Selenide, and Borane Derivatives of Indenylphosphines

Abstract

We report the preparation, isolation and characterization of oxide, sulfide, selenide, and borane derivatives of a series of indenylphosphines. Some members of the series had already been prepared, and we have completed the series. We have prepared (indenyl)_xPh_3-xPO (x = 1–3) for the oxide series, (indenyl)_xPh_3-xPS (x = 3) for the sulfides, (indenyl)_xPh_3-xPSe (x = 1,2) for the selenides, and (indenyl)_xPh_3-xPBH₃ (x = 1–3) for the boranes. Linear relationships of the ³¹P NMR chemical shift with the number of indenyl groups were observed. The compounds were also characterized by ¹H and ¹³C NMR spectroscopy and mass spectrometry. The solid-state structure of diindenylphenylphosphine selenide was determined by X-ray crystallography and found to be isomorphous with diindenylphenylphosphine sulfide. The solid-state structure of triindenylphosphine sulfide was also determined by X-ray crystallography and the indenyl groups were confirmed to all be the inden-3-yl isomer. Additionally, pentacarbonyl(triindenylphosphine)molybdenum(0), 1,3-bis(diphenylphosphino)indene diborane, and rac-bis(1-(diphenylphosphino)indenyl)ironII) diborane were prepared, isolated, and characterized.