| 摘要 |
PURPOSE:To obtain the titled compound useful as a raw material for preparing herbicides, etc. in high yield, by reacting an alkali metal salt of hydroquinone with an alpha-haloalkanoic acid ester in a specific alcohol. CONSTITUTION:An alkali metal salt of hydroquinone is reacted with a compound expressed by formula I (X is Cl or Br; R<1> is H or lower alkyl; R<2> is lower alkyl) in an alcohol expressed by the formula R<3>OH (R<3> is CH3, C2H5, CH3OCH2CH2 or C2H5OCH2CH2) to give the aimed compound expressed by formula II. The amount of the compound expressed by formula I is usually equimolar with the hydroquinone, but may be 40-80mol% for improving particularly the selectivity. The molar amount of the alkali metal salt to be used is 1.0-2.5 times that of the hydroquinone, but preferably 1.7 times or more for improving the selectivity. The reaction is carried out at 0-100 deg.C, preferably 30-60 deg.C.
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