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-One Compounds, .alpha.-Halo-Acetoacetic Esters Prepared from Such Compounds and Process for their Preparation Disclosed are 5-halo-4H-1,3-dioxin-4-ones and their preparation by treating a compound having the formula 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 -40.degree.C. to about 50.degree.C. to provide an .alpha.-haloaceto-acetic ester.