Patent ID: 7102016

Claim:
Process for preparing compounds of the general formula (I) where A is an optionally substituted C 2 –C 4 -alkylene radical, R is one or more, identical or different, linear or branched, optionally substuituted C 1 –C 18 -alkyl radical(s), optionally substituted C 5 –C 12 -cycloalkyl radical(s), optionally substituted C 6 –C 14 -aryl radical(s), optionally substituted C 1 –C 4 -hydroxyalkyl radical(s) or one or more hydroxyl radical(s), x is an integer from 0 to 8, comprising reacting compounds of the general formula (II) where A, R and x are each as defined for the compounds of the general formula (I) with a dehydrogenating agent.