| 摘要 |
The invention relates to the preparation of pyrocarbonic acid diesters by an improved process and to the novel pyrocarbonic acid diesters prepared according to said process as well as to the use thereof.The core of the invention is a process for the preparation of a pyrocarbonic acid diester of formula (I)wherein R1 and R1' are each independently of the other branched or straight-chain C1-C24alkyl, C3-C24alkenyl, C3-C24alkynyl, C4-C12cycloalkyl, C4-C12cycloalkenyl or C7-C24aralkyl, each of which is unsubstituted or substituted by one or more than one substituent which is inert under the reaction conditions,by reacting at least one ester carbonate of formula (II) with 40-50 mol % of a sulfochloride of formula (IV) in the presence of 0.8-5 mol % of a catalyst of formula (V)and with minor amounts of a heterocyclic aromatic amine in a nonpolar inert solvent,in which process the amount of heterocyclic aromatic amine is 1-3 mol % and the reaction is carried out in the temperature range from -10° C. to +25° C., all molar amounts being based on 100 mol % of ester carbonate of formula (II).
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