Process to make 2,3-dihalopropanols
    22.
    发明授权
    Process to make 2,3-dihalopropanols 失效
    制备2,3-二卤丙醇的方法

    公开(公告)号:US5744655A

    公开(公告)日:1998-04-28

    申请号:US667526

    申请日:1996-06-19

    摘要: A 2,3-dihalopropanol is made by reacting 2,3-dihalopropanal with a hydrogenating agent in the presence of a transition metal-containing catalyst, under conditions such that 2,3-dihalopropanol is formed. The reaction is particularly useful as Step (3) in a process to make epihalohydrin by: (1) reacting a 3-carbon hydrocarbon with an oxidizing agent to form acrolein; (2) reacting acrolein with a molecular halogen to form 2,3-dihalopropanal; (3) reducing 2,3-dihalopropanal to form 2,3-dihalopropanol; and (4) cyclizing 2,3-dihalopropanol to make epihalohydrin. The process produces epihalohydrin using only about one mole of halogen per mole of epihalohydrin. It also uses substantially less water than existing processes.

    摘要翻译: 在含过渡金属的催化剂存在下,在形成2,3-二卤丙醇的条件下,通过2,3-二卤代丙醛与氢化剂反应制备2,3-二卤丙醇。 在通过以下步骤制备表卤代醇的方法中,作为步骤(3)特别有用:(1)使3-碳烃与氧化剂反应形成丙烯醛; (2)使丙烯醛与分子卤素反应形成2,3-二卤代丙醛; (3)还原2,3-二卤丙醛以形成2,3-二卤丙醇; 和(4)环化2,3-二卤丙醇以制备表卤代醇。 该方法使用每摩尔表卤代醇仅使用约1摩尔卤素产生表卤代醇。 它还使用比现有工艺少得多的水。

    Process for preparing hydroxyalkylbenzocyclobutenes
    23.
    发明授权
    Process for preparing hydroxyalkylbenzocyclobutenes 失效
    制备羟烷基苯并环丁烯的方法

    公开(公告)号:US5349095A

    公开(公告)日:1994-09-20

    申请号:US982213

    申请日:1992-11-25

    摘要: A process for preparing a substituted or unsubstituted 3- or 4-hydroxyalkylbenzocyclobutene compound comprises reducing a corresponding 3- or 4-formyl or ketobenzocyclobutene compound with a hydride at a temperature below that at which dimerization or oligomerization of the formyl- or ketobenzocycloutene compound or the thus-produced hydroxyalkylbenzocyclobutene compound is a significant side reaction, for a time sufficient to convert the formyl- or ketobenzocyclobutene compound to the hydroxyalkylbenzocyclobutene compound. In a two-step process, formylbenzocyclobutenes are prepared from bromobenzocyclobutenes in 90% yield or from benzocyclobutenes in a 70% yield, and then converted to hydroxymethylbenzocyclobutenes for an overall yield of about 85% from a bromobenzocyclobutene or of about 65% from a benzocyclobutene. In a two-step process, ketobenzocyclobutenes from bromobenzocyclobutene Grignard reagents and an N-alkanoyl- or N-aroyl-2-methylaziridine are converted to hydroxyalkylbenzocyclobutenes in high yields.

    摘要翻译: 取代或未取代的3-或4-羟基烷基苯并环丁烯化合物的方法包括在低于甲酰基或酮基苯并环丁烯化合物的二聚或低聚的温度下用氢化物还原相应的3-或4-甲酰基或酮基苯并环丁烯化合物或 因此产生的羟烷基苯并环丁烯化合物是足够将甲酰基或酮基苯并环丁烯化合物转化为羟烷基苯并环丁烯化合物的显着副反应。 在两步法中,甲酰基苯并环丁烯由90%产率的溴代苯并环丁烯或70%产率的苯并环丁烯制备,然后从溴代苯并环丁烯转化为羟甲基苯并环丁烯,总产率为约85%,或从苯并环丁烯转化为约65%。 在两步法中,来自溴苯并环丁烯格氏试剂和N-烷酰基或N-芳酰基-2-甲基氮丙啶的酮基苯并环丁烯以高产率转化为羟基烷基苯并环丁烯。

    Process and intermediates for the preparation of 2,6-difluoroaniline
    25.
    发明授权
    Process and intermediates for the preparation of 2,6-difluoroaniline 失效
    制备2,6-二氟苯胺的方法和中间体

    公开(公告)号:US5041674A

    公开(公告)日:1991-08-20

    申请号:US537975

    申请日:1990-06-14

    IPC分类号: C07C209/36 C07C211/52

    CPC分类号: C07C211/52 C07C209/365

    摘要: 1-Chloro-3,5-difluorobenzene is chlorinated to give 4,6-difluoro-1,2,3-trichlorobenzene which in turn is nitrated and reduced to the corresponding novel aniline, 2,6-difluoro-3,4,5-trichloroaniline. Further reduction of this aniline provides 2,6-difluoroaniline with high selectivity.

    摘要翻译: 氯化1-氯-3,5-二氟苯,得到4,6-二氟-1,2,3-三氯苯,然后将其硝化并还原成相应的新型苯胺,2,6-二氟-3,4,5 三氯苯胺 该苯胺的进一步还原提供了高选择性的2,6-二氟苯胺。

    Preparation of 3,4-difluorobenzotrifluoride
    28.
    发明授权
    Preparation of 3,4-difluorobenzotrifluoride 失效
    制备3,4-二氟三氟甲苯

    公开(公告)号:US4937396A

    公开(公告)日:1990-06-26

    申请号:US276711

    申请日:1988-11-28

    IPC分类号: C07C17/20 C07C255/50

    CPC分类号: C07C255/50 C07C17/208

    摘要: 3,4-Difluorobenzotrifluoride is prepared by contacting a 3,4-dihalobenzotrifluoride with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.

    摘要翻译: 通过在极性非质子溶剂中在高温下在基本上无水的条件下使3,4-二卤代三氟甲苯与有效量的KF或CsF接触来制备3,4-二氟三氟甲苯。 产物可以在其形成时被除去,或者反应可以在密封反应器中由反应混合物产生的自生压力下进行。

    1-acyl-1-(2-pyridinyl)semicarbazides
    29.
    发明授权
    1-acyl-1-(2-pyridinyl)semicarbazides 失效
    1-酰基-1-(2-吡啶基)氨基脲

    公开(公告)号:US4681943A

    公开(公告)日:1987-07-21

    申请号:US840359

    申请日:1986-03-17

    CPC分类号: C07D213/77 C07D401/04

    摘要: 5-Alkyl-1-(2-pyridinyl)-1H-1,2,4-triazol-3-ols are prepared in good yield by reacting an appropriate 1-acyl-1-(2-pyridinyl)-semicarbazide with a base in the presence of a non-nucleophilic solvent. The compounds so prepared are intermediates used in the preparation of insecticides. The starting semicarbazide materials are novel compounds.

    摘要翻译: 通过使适当的1-酰基-1-(2-吡啶基) - 氨基脲与碱反应,以良好的收率制备5-烷基-1-(2-吡啶基)-1H-1,2,4-三唑-3-醇 在非亲核溶剂的存在下。 如此制备的化合物是用于制备杀虫剂的中间体。 起始氨基脲材料是新型化合物。

    Process for preparing substituted benzotrihalides
    30.
    发明授权
    Process for preparing substituted benzotrihalides 失效
    取代苯并三卤化物的制备方法

    公开(公告)号:US4334111A

    公开(公告)日:1982-06-08

    申请号:US878845

    申请日:1978-02-17

    CPC分类号: C07C17/363 C07C51/58

    摘要: Benzotrihalides are prepared by pyrolyzing a substituted phenyl trihaloacetate of the formula ##STR1## wherein each X is halo, nitro, alkyloxy, aryloxy, aralkyoxy, cyano, lower alkyl, haloalkyl, haloalkyloxy, alkenyl, haloalkenyl, carbamoyl, N,N-dialkylcarbamoyl, N,N-diarylcarbamoyl, or N,N-diaralkyloxy;Y is halo; andn is an integer of from 1 to 5. As an example, 4-chlorophenyl trichloroacetate is pyrolyzed at 550.degree. C. to 4-chlorobenzotrichloride.

    摘要翻译: 苯并三卤化物是通过热分解式为“IMAGE”的取代的三卤代苯基苯,其中每个X是卤素,硝基,烷氧基,芳氧基,芳烷氧基,氰基,低级烷基,卤代烷基,卤代烷氧基,烯基,卤代烯基,氨基甲酰基,N,N-二烷基氨基甲酰基, N,N-二芳基氨基甲酰基或N,N-二芳烷氧基; Y是卤素; n为1〜5的整数。作为实例,将三氯乙酸4-氯苯酯在550℃下热解成4-氯三氯甲苯。