| 摘要 |
A process for the preparation of orthoesters of the general formula I, where the radicals have the following meaning R<1>: hydrogen, C1- to C20-alkyl, C2- to C20-alkenyl, C2- to C20-alkynyl, C3- to C12-cycloalkyl, C4- to C20-cycloalkylalkyl or C4- to C10-aryl R<2>, R<3>: C1- to C20-alkyl, C3- to C12-cycloalkyl, and C4- to C20-cycloalkylalkyl or R<2 >and R<3 >together form C2- to C10-alkylene R<4>: C1- to C4-alkyl, by electrochemically oxidizing a compound of the general formula II in which the radicals R<1 >to R<3 >have the same meaning as in the general formula I and R<5 >is a saturated or unsaturated 5- or 6-membered heterocycloalkyl radical or heterocycloaryl radical having up to 2 heteroatoms selected from the group consisting of N, O and S, where this radical is bonded to the remaining part of the molecule via a carbon atom which is situated in the adjacent position to a heteroatom, in the presence of C1- to C4-alcohols (alcohols A).
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