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    • 84. 发明授权
    • Preparation of pyrroles
    • 吡咯的制备
    • US6162928A
    • 2000-12-19
    • US553254
    • 2000-04-20
    • Joachim Wulff-DoringJoachim SimonMichael HessePeter Wahl
    • Joachim Wulff-DoringJoachim SimonMichael HessePeter Wahl
    • B01J23/44B01J23/63C07B61/00C07D207/32C07D207/323
    • C07D207/323B01J23/44B01J23/63
    • A process for preparing pyrroles of the formula I: ##STR1## where R.sub.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and are hydrogen atoms, alkyl groups having from 1 to 12 carbon atoms or cycloalkyl groups having from 3 to 12 carbon atoms, by dehydrogenation of pyrrolidines of the formula II: ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined above, in the presence of a supported noble metal catalyst is described. In this process, the dehydrogenation is carried out at from 150 to 300.degree. C. and pressures of from 0.01 to 50 bar and the noble metal catalyst comprises from 30 to 100% by weight of:a) palladium on an oxide of a rare earth or an oxide of an element of the 4.sup.th group (transition group IV) of the Periodic Table, orb) a platinum/palladium mixture on aluminum oxide, an oxide of a rare earth or an oxide of an element of the 4.sup.th groupand from 0 to 70% by weight of alkali metal oxide or alkaline earth metal oxide.
    • 制备式I的吡咯的方法:其中R 1,R 2,R 3和R 4相同或不同,为氢原子,具有1至12个碳原子的烷基或具有3至12个碳原子的环烷基,通过脱氢 描述了在负载的贵金属催化剂的存在下,式II的吡咯烷(其中R 1,R 2,R 3和R 4如上定义)。 在该方法中,脱氢在150-300℃,压力为0.01至50巴,贵金属催化剂包含30-100重量%的:a)在稀土氧化物上的钯 或元素周期表第4族元素(过渡组IV)的氧化物,或b)在氧化铝上的铂/钯混合物,稀土的氧化物或第4族元素的氧化物, 0〜70重量%的碱金属氧化物或碱土金属氧化物。
    • 90. 发明授权
    • Preparation of acylated imidazoles
    • 酰化咪唑的制备
    • US4924000A
    • 1990-05-08
    • US321110
    • 1989-03-09
    • Michael HesseWolfgang HoelderichToni DocknerHermann Koehler
    • Michael HesseWolfgang HoelderichToni DocknerHermann Koehler
    • B01J21/00B01J21/04B01J21/06B01J21/08B01J23/20B01J27/18B01J29/04C07B61/00C07D233/54C07D233/64
    • C07D233/64
    • Acylated imidazoles of the formula ##STR1## where R.sup.1 and R.sup.3 are each H, alkyl of from 1 to 12 carbon atoms, alkenyl of from 1 to 12 carbon atoms, aryl, aralkyl or alkylaryl, R.sup.4 is H, alkyl of from 1 to 12 carbon atoms, alkenyl of from 1 to 12 carbon atoms, aryl, aralkyl or alkylaryl, and R.sup.5 is alkyl of from 1 to 12 carbon atoms, alkenyl of from 1 to 12 carbon atoms, aryl, aralkyl, alkylaryl or carboxyl, are prepared by reacting imidazoles of the formula ##STR2## where R.sup.1, R.sup.2 and R.sup.3 are each alkyl of from 1 to 12 carbon atoms, alkenyl of from 1 to 12 carbon atoms, aryl, aralkyl or alkylaryl, at least one of the radicals R.sup.1, R.sup.2 and R.sup.3 being hydrogen, and R.sup.4 is H, alkyl of from 1 to 12 carbon atoms, alkenyl of from 1 to 12 carbon atoms, aryl, aralkyl or alkylaryl, with widely used acylating agents of the formula ##STR3## where R.sup.5 is as defined above and Y is halide, alkoxy, acyloxy or hydroxyl, in the presence of acidic metal oxides and/or phosphates, preferably in the gas phase.
    • 其中R 1和R 3各自为H,具有1至12个碳原子的烷基,1至12个碳原子的烯基,芳基,芳烷基或烷基芳基,R 4为H,1至12的烷基, 碳原子,1至12个碳原子的烯基,芳基,芳烷基或烷基芳基,R5是1至12个碳原子的烷基,1至12个碳原子的烯基,芳基,芳烷基,烷基芳基或羧基, 使式(Ia)的咪唑与R1,R2和R3各自为1至12个碳原子的烷基,1至12个碳原子的烯基,芳基,芳烷基或烷基芳基,基团R1,R2和 R3为氢,R4为H,1至12个碳原子的烷基,1至12个碳原子的烯基,芳基,芳烷基或烷基芳基,以及广泛使用的通式为“IMAGE”的酰化剂,其中R5如上定义 在酸性金属氧化物和/或磷酸盐的存在下,优选在气相中,Y是卤化物,烷氧基,酰氧基或羟基。