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    • 7. 发明授权
    • Process for making trans-isocarveol
    • 制备反异构体的方法
    • US07884252B1
    • 2011-02-08
    • US12799119
    • 2010-04-19
    • Gennadiy G. KolomeyerDouglas A. Ferone
    • Gennadiy G. KolomeyerDouglas A. Ferone
    • C07C35/18
    • C07C29/56C07B2200/07C07C2601/14C07C35/17
    • A process for making trans-isocarveol, an intermediate useful in the manufacture of perillyl alcohol, is disclosed. The process comprises isomerizing a mixture comprising cis-limonene oxide (cis-LMO) and trans-limonene oxide (trans-LMO) in the presence of a phenolic modifier and a chromium catalyst. The process is performed at a temperature less than 220° C. to convert more than 50% of the cis-LMO to trans-isocarveol and less than 50% of the trans-LMO to cis-isocarveol. We surprisingly found that a mixture of cis- and trans-LMO can be selectively isomerized to produce mostly trans-isocarveol, which we discovered is the preferred isomer for making perillyl alcohol by direct isomerization.
    • 公开了制备反式 - 异环素的方法,其是可用于制备香叶醇的中间体。 该方法包括在酚类改性剂和铬催化剂存在下异构化包含顺式柠檬烯氧化物(顺式 - LMO)和反式柠檬烯氧化物(反式 - LMO)的混合物。 该方法在低于220℃的温度下进行,以将超过50%的顺式 - 改性活生物体转化成反式异环素和小于50%的反式LMO转化成顺式 - 异环素。 我们惊奇地发现,可以选择性地将顺反异构体和反式LMO的混合物异构化以产生大多数反式异环素,我们发现它是通过直接异构化制备紫苏醇的优选异构体。