| http://www.w3.org/ns/prov#value | - Compounds of the formula I, wherein R1 is a substituted alkyl group, can be obtained from the compounds of the formula Ar--CO--CH(R2)--X]n by reaction with aldehydes (R1 =hydroxyalkyl) or with a vinyl compound which is capable of addition, for example with acrylates or acrylonitrile.
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