申请人:Ciba Specialty Chemicals Corporation
公开号:US06359122B1
公开(公告)日:2002-03-19
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).
该发明涉及通过改进的方法制备吡碳酸二酯以及根据该方法制备的新型吡碳酸二酯的用途。该发明的核心是一种制备式(I)的吡碳酸二酯的方法,其中R1和R1'各自独立地为分支或直链的C1-C24烷基,C3-C24烯基,C3-C24炔基,C4-C12环烷基,C4-C12环烯基或C7-C24芳基烷基,每种基团未被取代或被一个或多个在反应条件下是惰性的取代基取代,通过将至少一种式(II)的酯碳酸与40-50摩尔%的式(IV)的磺酰氯在0.8-5摩尔%的式(V)的催化剂存在下,以及微量的杂环芳香胺在非极性惰性溶剂中反应,其中杂环芳香胺的量为1-3摩尔%,反应在-10°C至+25°C的温度范围内进行,所有摩尔量均基于100摩尔%的酯碳酸的基础。