Optically active N-.alpha.-fluoroacryloylamino acid polymers for the resolution of racemates

An optically active polymer containing at least 40 mol % of structural units of the formula (V) ##STR10## in which R.sub.1 represents a straight-chain or branched C.sub.1 -C.sub.8 -alkyl, a C.sub.7 -C.sub.12 -aralkyl, a C.sub.3 -C.sub.10 -cycloalkyl, a C.sub.6 -C.sub.14 -aryl or a furyl, thienyl or pyridyl radical, which are unsubstituted or substituted by benzyloxycarbonyl, alkoxycarbonyl of up to 6 C atoms, hydroxyl, alkyl, cycloalkyl or alkoxy each having up to 6 C atoms, halogen, phenoxy, benzoxy, acylamino of up to 8 C atoms or by carbonylalkoxy of up to 6 C atoms,

• R.sub.3 represents hydrogen or C.sub.1 -C.sub.4 -alkyl or together with R.sub.1 forms a tri- or tetramethylene group,
• X is oxygen or an NR group, in which
• R.sub.4 represents hydrogen or straight-chain or branched C.sub.1 -C.sub.4 -alkyl or together with R.sub.2 and the nitrogen atom forms a 5- or 6-membered ring which is unsubstituted or substituted by an alkoxycarbonyl group of up to 6 carbon atoms or by one or two alkyl groups each having 1 to 4 carbon atoms, and
• R.sub.2 represents a straight-chain or branched C.sub.1 -C.sub.22 -alkyl, C.sub.7 -C.sub.12 -aralkyl, C.sub.3 -C.sub.10 -cycloalkyl, C.sub.6 -C.sub.14 -aryl or a terpenyl radical, each of which is unsubstituted or substituted by halogen, alkyl or alkoxy each having to 4 C atoms.