| 摘要 |
PCT No. PCT/JP97/00528 Sec. 371 Date Aug. 25, 1998 Sec. 102(e) Date Aug. 25, 1998 PCT Filed Feb. 25, 1997 PCT Pub. No. WO97/30962 PCT Pub. Date Aug. 28, 1997A process for preparing alpha -hydroxy acids by heating ammonium salts of alpha -hydroxy acids of general formula (I), removing the formed ammonia and water, adding water to the residue, and heating the obtained mixture, wherein R is hydrogen, C1-C6 alkyl, alkyl(C1-C6)thioalkyl (C1-C6), phenyl or the like. This process is freed from the problem of disposal of by-products such as ammonium bisulfate and makes it possible to prepare a free alpha -hydroxy acid from an ammonium salt thereof economically and in a high yield.
|
