An improved synthesis of functionalized biphenyl-based phosphine ligands

J Org Chem. 2000 Aug 25;65(17):5334-41. doi: 10.1021/jo000691h.

Abstract

Functionalized dicyclohexyl- and di-tert-butylphosphinobiphenyl ligands are prepared by the reaction of arylmagnesium halides with benzyne, followed by the addition of a chlorodialkylphosphine. This one-pot procedure is considerably less expensive and time-consuming than the method used previously to prepare such ligands. The cost of introducing the dicyclohexylphosphine group can be decreased by preparing chlorodicyclohexylphosphine from PCl3 and cyclohexylmagnesium chloride, and using the reagent without further purification. The new method is significant, as a variety of ligands can be produced in useful amounts by a procedure that is simple, with starting materials that are relatively inexpensive, and, in most cases, without chromatographic purification.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Biphenyl Compounds / chemical synthesis*
  • Biphenyl Compounds / chemistry
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Phosphines / chemistry*
  • Spectrophotometry, Infrared

Substances

  • Biphenyl Compounds
  • Ligands
  • Phosphines
  • phosphine