Degussa Aktiengesellschaft

Doris Krammer

Thomas Güthner

A process is described for preparing 3-amino-4,4,4-trifluorocrotonic esters of the formula (I) or the E/Z isomers or tautomeric forms thereofwhere Rand Rare each independently hydrogen, an optionally substituted linear C&#x2013;C-alkyl radical or an optionally substituted benzyl radical and Ris methyl or ethyl, which comprises With the aid of this two-stage process, the 3-amino-4,4,4-trifluorocrotonic esters can be prepared in high yields without significant by-products.

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Truchtlaching, Germany

Doris Krammer