| 摘要 |
PURPOSE:In halogenating a 2,3-dihalogeno-3-phenylpropionaldehyde, to obtain the titled compound useful as an intermediate mainly for agricultural chemicals industrially advantageously in high yield, by adding a specific azo compound to it. CONSTITUTION:1mol 2,3-dihalogeno-3-phenylpropionaldehyde is halogenated in the presence of 50-500mg, especially 100-200mg azo compound, especially alpha,alpha'- azobisisobutylonitrile shown by the formula I (R are R' are lower alkyl, or cycloalkyl; A is CN, or alkoxycarbonyl) at 30-80 deg.C, preferably 40-60 deg.C, to give a 2,3-dihalogeno-3-phenyl-propionic acid halide shown by the formula II (X is halogen) by a common reactor economically, safely and industrially in high yield. |
