Stereospecific synthesis of diastereoisomerically pure (–)-(R<sub>p</sub>)-O-menthyl methylphenylphosphinite and ethylphenylphosphinite: key intermediates in synthesis of chiral tertiary phosphines
The reaction of the diastereoisomericallypure (–)-(RP)-O-menthylmethylphenylphosphinite (9) and (–)-(RP)-O-menthylethylphenylphosphinite (2) with organolithium reagents has been found to give chiraltertiaryphosphines (10) and (11) with a very high optical purity.