REACTIONS OF CARBENE INTERMEDIATES FROM THE REACTION OF TRIALKYL PHOSPHITES WITH DIALKYL BENZOYLPHOSPHONATES - PREPARATION AND REACTIONS OFDIMETHYL 2-(N-TERT-BUTYL-N-METHYLAMINO)BENZOYLPHOSPHONATE AND DIMETHYL 2-(METHYLAMINO)BENZOYLPHOSPHONATE

Dimethyl 2-(methylamino)benzoylphosphonate has been prepared by the th ermal decomposition of dimethyl 2-(N-tert-butyl-N-methylamino)benzoylp hosphonate formed by the action of triethylamine on imethoxyphosphinyl )-1-methyl-2,1-benzisoxazolinium hexafluorophosphate, The reactions of both benzoylphosphonates with trimethyl phosphite proceed via carbene intermediates 4 to initially give ylidic phosphonates 5, which for 5( X = 2-MeNH) undergoes cyclisation and rearrangement to give the novel 2-oxophosphorindoline 11.dagger