ONE-STEP CONVERSION OF ACETOPHENONES TO α-HALOACETOPHENONE DIMETHYL ACETALS USING DCDMH/DBDMH AND MOLECULAR SIEVE IN METHANOL

Using DCDMH/DBDMH as N-halo reagent, piperidine as catalyst, and 4-A molecular sieve as water-removing agent, alpha-haloacetophenone dimethyl acetals were directly obtained from the solvent of methanol. As to the substrates with electron-withdrawing groups, the conversions were 80-100%.