5-HALO-4H-1,3-DIOXIN-4-ONE COMPOUNDS, alpha -HALO-ACETOACETIC ESTERS PREPARED FROM SUCH COMPOUNDS AND PROCESS FOR THEIR PREPARATION

摘要

5-halo-4H-1,3-dioxin-4-ones and their preparation by treating a compound having formula (I), with X2 or SO2X2 wherein X is Cl or Br. The 5-halo-4H-1,3-dioxin-4-ones can then be reacted with an alkali metal alkoxide at a temperature of about -40C. to about 50C. to provide an alpha -haloaceto-acetic ester.