| 摘要 |
A process for the preparation of compounds of formula wherein R1 is C1-C6alkyl and X is hydrogen, a hydrocarbon radical or a cation, wherein a compound of formula wherein R1 is as defined above and R2 is hydrogen or a hydrocarbon radical, is reduced, the resulting compound of formula is reacted with a compound that introduces the radical of formula -CH2-COOR3, wherein R3 has the meanings given above for R2, and the resulting compound of formula is reduced and optionally hydrolysed.
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