| abstract |
The present invention relates to a formula (1): R a -R 2 -R 1 -R b wherein: R a is COF, COOR 11 , CH 2 OH or CHO; R b is COF, COOR 11 , CH 2 OH or CHO; R 11 is each independently a hydrogen atom or an optionally substituted C1-C6 alkyl group; R 1 is an alkylene group having 2 to 10 carbon atoms which may be substituted with fluorine; R 2 is -R 6a -(OR 5a ) n -O-; R 5a is a linear or branched alkylene group having 2 to 10 carbon atoms which may be substituted with fluorine; R 6a is a linear or branched alkylene group having 1 to 9 carbon atoms which may be substituted with fluorine.]. |