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    • 4. 发明授权
    • Conversion of 1,3-dioxanes to 4-oxaaldehydes
    • 1,3-二恶烷转化为4-氧杂醛
    • US4939280A
    • 1990-07-03
    • US188416
    • 1988-04-29
    • Wolfgang HoelderichFranz MergerHelmut Lermer
    • Wolfgang HoelderichFranz MergerHelmut Lermer
    • C07C45/60C07C47/198C07C47/277C07D335/02
    • C07C47/198C07C45/60C07C47/277C07D335/02
    • 4-Oxaaldehydes of the formula ##STR1## are prepared by catalytic isomerization of 1,3-dioxanes by a process in which a 1,3-dioxane of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.4 and R.sup.5 are identical or different and are each hydrogen, a straight-chain or branched alkyl, alkenyl or alkynyl radical of not more than 18 carbon atoms, a cycloalkyl or cycloalkenyl radical of 5 to 8 carbon atoms, an aryl, alkylaryl, aralkyl or alkenylaryl radical of 5 to 16 carbon atoms or a heterocyclic radical, and furthermore R.sup.1 and R.sup.2 and/or R.sup.4 and R.sup.5 together with the carbon atom to which they are bonded may form a cycloalkane, a cycloalkene or a heterocyclic structure, and the stated radicals may furthermore carry substituents which are inert under the reaction conditions, and R.sup.3 is hydrogen or straight-chain or branched alkyl, is isomerized using a phosphate as a catalyst.
    • 通过其中R1,R2,R4和R5相同或不同的式“IMAGE”的1,3-二恶烷的方法,通过1,3-二恶烷的催化异构化制备式“IMAGE”的4-氧代醛, 各自为氢,不超过18个碳原子的直链或支链烷基,烯基或炔基,5至8个碳原子的环烷基或环烯基,5至16个碳的芳基,烷基芳基,芳烷基或烯基芳基 原子或杂环基团,此外,R 1和R 2和/或R 4和R 5与它们所键合的碳原子一起可以形成环烷烃,环烯烃或杂环结构,并且所述基团还可以携带惰性的取代基 在反应条件下,R 3为氢或直链或支链烷基,使用磷酸酯作为催化剂异构化。
    • 6. 发明授权
    • Conversion of 1,3-dioxanes to 4-oxaaldehydes
    • 1,3-二恶烷转化为4-氧杂醛
    • US5012005A
    • 1991-04-30
    • US385925
    • 1989-07-27
    • Wolfgang HoelderichFranz Merger
    • Wolfgang HoelderichFranz Merger
    • C07C45/60C07C47/198C07C47/277C07D335/02
    • C07C47/277C07C45/60C07C47/198C07D335/02
    • 4-oxaaldehydes of the formula ##STR1## are prepared by catalytic isomerization of 1,3-dioxanes by a process in which a 1,3-dioxane of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.4 and R.sup.5 are identical or different and are each hydrogen, a straight-chain or branched alkyl, alkenyl or alkynyl radical of not more than 18 carbon atoms, a cycloalkyl or cycloalkenyl radical of 5 to 8 carbon atoms, an aryl, alkylaryl, aralkyl, aralkenyl or alkenylaryl radical of 5 to 16 carbon atoms or a heterocyclic radical and furthermore R.sup.1 and R.sup.2 and/or R.sup.4 and R.sup.5 together with the carbon atoms to which they are bonded may form a cycloalkane, a cycloalkene or a heterocyclic structure, and the stated radicals may furthermore carry substituents which are inert under the reaction conditions, and R.sup.3 is hydrogen or straight-chain or branched alkyl, is isomerized using a metal oxide catalyst, which has been treated with an acid, and/or a silica phase having a zeolite structure.
    • 通过其中R1,R2,R4和R5是相同或不同的式“IMAGE”的1,3-二恶烷的方法,通过1,3-二恶烷的催化异构化制备式“IMAGE”的4-氧代醛, 各自为氢,不超过18个碳原子的直链或支链烷基,烯基或炔基,5至8个碳原子的环烷基或环烯基,芳基,烷基芳基,芳烷基,芳烯基或链烯基芳基,其5至 16个碳原子或杂环基团,此外,R 1和R 2和/或R 4和R 5与它们所键合的碳原子一起可以形成环烷烃,环烯烃或杂环结构,并且所述基团还可以具有取代基, 使用已用酸处理的金属氧化物催化剂和/或具有沸石结构的二氧化硅相异构化在反应条件下惰性的R 3为氢或直链或支链烷基。