Notesated phosphine. A possible sequence of events to account for the product is shown above. The transesterification may occur before or after the ring cleavage.
Experimental SectionGeneral. Reactions of phosphines were conducted under nitrogen. Mp values are corrected. Proton nmr spectra were taken with JEOL MH-100 or Varían T-60 spectrometers. Proton-decoupled 31P nmr spectra were taken on a Bruker HFX-10 system at 36.43 MHz; shifts are relative to external 85% H3PO4. The proton-decoupled 13C nmr spectrum was obtained by the Fourier transform technique on the Bruker spectrometer at 22.62 MHz utilizing C6Fe as external heteronuclear lock in a 3-mm coaxial capillary. Analyses were performed by MHW Laboratories, Garden City, Mich.Synthesis of Methyl(4-carboxybutyl)phosphine Oxide (3) from Methyl l-Methylphospholane-2-carboxylate (1). To 30
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