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    • 6. 发明授权
    • Process for the preparation of cyclopropyl alkyl ketones
    • 制备环丙基烷基酮的方法
    • US6002046A
    • 1999-12-14
    • US263876
    • 1999-03-08
    • Manfred KaufholdWolfgang KleemissUdo JegelkaMichael Korell
    • Manfred KaufholdWolfgang KleemissUdo JegelkaMichael Korell
    • C07B61/00C07C45/59C07C45/67C07C45/82C07C45/85C07C49/293C07C45/54
    • C07C45/82C07C45/676C07C45/85
    • Cyclopropyl alkyl ketones are separated from 3-acyltetrahydrofuran-2-ones by adding an alcohol, water or a water/alcohol mixture to a reaction product containing C.sub.1-4 -alkyl cyclopropyl ketone and 4,5-dihydro-2-alkylfuran by-product and an acid catalyst and reacting the by-product with the added alcohol, water of water/alcohol mixture before, during or after distilling said reaction product; and effectively separating C.sub.1 -.sub.4 -alkyl cyclopropyl ketone from reaction by-products.In the preparation of cyclopropyl alkyl ketones from 3-acyltetrahydrofuran-2-ones very reactive 4,5-dihydro-2-alkylfurans are also produced. By reacting such compounds with nucleophilic compounds, such as alcohols or water, before, during or after distillation of the reaction products, it is possible reliably to separate off the 4,5-dihydro-2-alkylfurans as high-boiling addition compounds. The offgas which is produced in the production process for cyclopropyl alkyl ketones can be simply and reliably purified by reactive washing. The byproducts, which are difficult to handle for a production process, can thus be reliably eliminated.
    • 通过向含有C 1-4 - 烷基环丙基酮和4,5-二氢-2-烷基呋喃副产物的反应产物中加入醇,水或水/醇混合物将环丙基烷基酮与3-酰基四氢呋喃-2-酮分离 和酸催化剂,在蒸馏所述反应产物之前,期间或之后使副产物与所加入的醇,水/醇混合物的水反应; 并有效地将C1-4烷基环丙基酮与反应副产物分离。 在制备3-酰基四氢呋喃-2-酮的环丙基烷基酮时,也产生非常活泼的4,5-二氢-2-烷基呋喃。 通过使这些化合物与亲核化合物如醇或水反应,在反应产物蒸馏之前,期间或之后,可以可靠地将4,5-二氢-2-烷基呋喃分离成高沸点加成化合物。 在环丙基烷基酮的生产过程中生产的废气可以通过反应性洗涤简单可靠地纯化。 因此,可以可靠地消除对生产过程难以处理的副产物。