Ammonium Chloride → 2,2'-Bis(diisobutylphosphinomethyl)-1,1'-biphenyl

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Reaction Steps

Diisobutylphosphine (1.66 grams, 11.37 mmol) was dissolved in THF (25 ml) under nitrogen and cooled with a dry ice/acetone bath. n-Butyllithium (7.11 ml of a 1.6M solution in hexane, 11.37 mmol) was added dropwise to the stirring solution which was then allowed to stir for 1 hour in the cold bath. 2,2'-Bis(bromomethyl)-1,1'-biphenyl (1.89 grams, 5.55 mmol) in THF (10 ml) was added dropwise at -70° C. The solution was allowed to stir overnight at room temperature and was then heated at reflux for 1 hour. Saturated aqueous NH4Cl was added to the solution at room temperature. Diethyl ether was added and the layers were separated in a separatory funnel. The aqueous layer was extracted twice with diethyl ether, and the combined organic solution was then washed twice with water. The solvent was removed on a steam bath under a stream of nitrogen. The oily residue was then placed on a Kugelrohr distillation apparatus to remove low boiling material at about 175° C. and 1 mm Hg leaving 1.88 grams (72% yield) of a thick orange glassy product. 1H NMR (CDCl3): δ0.65-1.67 (complex, 36H, aliphatic); 2.42 (s, 4H, benzylic); 6.67-7.30 (complex, 8H aromatic). 31P NMR (CDCl3): δ+31.

Provenance & Evidence