Patent ID: 7723550

Claim:
Process for preparing a compound of the formula I in which R 1 is a linear or branched C 1 -C 8 -alkoxy-C 1 -C 8 -alkoxy radical, R 2 is a linear or branched C 1 -C 8 -alkyl radical or a linear or branched C 1 -C 8 -alkoxy radical, and R 3 is isopropyl, which is characterized in that a) a compound of the formula II in which R 1 and R 2 are each as defined above and X is Br, I, triflate, toyslate or mesylate is reacted with prop-2-yn-1-ol to give the compound of the formula III b) the compound of the formula III is reacted with an alkyl-metal compound in which “alkyl” is as defined above for R 3 to give a compound of the formula I.