Syntheses of some polymers containing cyclopropane rings in the main chain

Polyesters, polyamides, and polyurethanes containing cyclopropane rings in the main chains were prepared, using 1,2‐dimethylol‐cyclopropanedicarboxylic acid or 1,2‐dimethylol‐cyclopropane as one component. 1,2‐Cyclopropane dicarboxylic acid and its homologs were synthesized according to the method of McCoy. The separation of the cis and trans isomers of these acids was performed by treatment with thionyl chloride, where the trans isomers were converted into acid chlorides, while the cis isomers into acid anhydrides. 1,2‐Dimethylol‐cyclopropane was prepared by the reduction of 1,2‐cyclopropane dicarboxylic chloride with LiAlH 4 . The polymerization was carried out by the interfacial technique, solution polycondensation or the ester interchange method. Some polymers and their films showed good technological properties.