| 摘要 |
PCT No. PCT/JP98/03686 Sec. 371 Date Sep. 7, 1999 Sec. 102(e) Date Sep. 7, 1999 PCT Filed Aug. 20, 1998 PCT Pub. No. WO99/31050 PCT Pub. Date Jun. 24, 1999This invention has its objects to provide a process for producing a butyric acid ester derivative of the above general formula (2) which is capable of removing various impurity byproducts whose formation cannot be avoided by the prior art technology, particularly the compound of the above general formula (1), with good efficiency. This invention is related to a process for producing a butyric acid ester derivative of the general formula (2) which comprises treating a mixture containing a compound of the following general formula (1) with an addition reagent capable of adding itself to said ethylenic bond to thereby convert said compound of the general formula (1) to an addition product which can be easily separated from said butyric acid ester derivative of the general formula (2) and a process for producing a butyric acid ester derivative of the general formula (2) which comprises reacting a compound of the general formula (3) with a salt of prussic acid by a flow method. HOCH2-CH=CH-COOR(1)
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