C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 255/37 (2006.01) C07C 253/34 (2006.01)
Patent
CA 2162344
The present invention relates to the compounds cis- 4-(2,2,3,3-tetrafluoropropoxy)cinnamonitrile and trans- 4-(2,2,3,3-tetrafluoropropoxy)cinnamonitrile and to a process for their preparation. The process relates to the preparationofcis-4-(2,2,3,3-tetrafluoropropoxy)cinnamo- nitrile and trans-4-(2,2,3,3-tetrafluoropropoxy)cinnamo- nitrile or optionally one of these two compounds, by fractionally distilling a mixture containing cis- and trans-4-(2,2,3,3-tetrafluoropropoxy)cinnamontrile under reduced pressure, separating off a main fraction contain- ing at least 80% by weight of cis-4-(2,2,3,3-tetrafluoro- propoxy)cinnamonitrile and a main fraction containing at least 80% by weight of trans-4-(2,2,3,3-tetrafluoro- propoxy)cinnamonitrile, further purifying these main fractions by means of fractional crystallization or melt crystallization or adjusting one of these main fractions by isomerization to the cis/trans isomer ratio corre- sponding to the particular thermodynamic equilibrium and returning it to the process and returning the remaining fractions to the process directly or after isomerization.
Beller Matthias
Pfirmann Ralf
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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