Process for preparation of isoprene
    2.
    发明授权
    Process for preparation of isoprene 失效
    异戊二烯的制备方法

    公开(公告)号:US3972955A

    公开(公告)日:1976-08-03

    申请号:US505894

    申请日:1974-09-13

    CPC分类号: C07C11/18 C07D319/06

    摘要: In the preparation of isoprene by reacting isobutene with formaldehyde to produce 4,4-dimethyl-m-dioxane in a first stage, and decomposing the dioxane to isoprene and formaldehyde in a second stage, formaldehyde in the effluent streams of either or both of said stages is recovered. The formaldehyde-containing liquids are distilled to separate high boilers; the overhead, which is formaldehyde-rich, is extracted with isobutene feed to the process, whereby the isobutene extracts low boilers from the formaldehyde-containing liquid; and the formaldehyde-containing liquid, having at some point after said distillation been treated with an alkaline material, is subjected to rectification to produce as head product, the recovered formaldehyde.

    摘要翻译: 在通过使异丁烯与甲醛反应以在第一阶段中制备4,4-二甲基 - 间二恶烷制备异戊二烯并在第二阶段中将二恶烷分解成异戊二烯和甲醛的过程中,所述 阶段恢复。 将含甲醛的液体蒸馏以分离高锅炉; 富含甲醛的塔顶馏出物用异丁烯进料提取到该方法中,由此异丁烯从含甲醛的液体中提取低沸点物; 并且在所述蒸馏之后的某一点处,用碱性物质处理的含甲醛的液体经过精馏,作为回收的甲醛的头部产物。

    Process for the preparation of hexahydrophthalic acid anhydride
    5.
    发明授权
    Process for the preparation of hexahydrophthalic acid anhydride 失效
    六氢邻苯二甲酸酐的制备方法

    公开(公告)号:US4244877A

    公开(公告)日:1981-01-13

    申请号:US41547

    申请日:1979-05-23

    IPC分类号: C07C51/377 C07D307/89

    CPC分类号: C07C51/377

    摘要: A process for the preparation of hexahydrophthalic acid anhydride which comprises hydrogenation .DELTA..sup.4 -tetrahydrophthalic acid anhydride in the liquid phase at a temperature of from 70.degree. to 150.degree. C. and at a pressure of from 30 to 200 bar in the presence of a catalyst selected from palladium, ruthenium, nickel or mixtures thereof arranged in a fixed bed, wherein the catalyst is applied to a carrier of alumina of which at least 20% by weight has been converted into lithium aluminium spinel and the liquid phase is a mixture of .DELTA..sup.4 -tetrahydrophthalic acid anhydride and hexahydrophthalic anhydride in a proportion by weight of from 1:1 to 1:100.

    摘要翻译: 一种制备六氢邻苯二甲酸酐的方法,其包括在液相中在催化剂存在下,在70〜150℃,压力为30〜200巴的条件下氢化DELTA4-四氢邻苯二甲酸酐 选自钯,钌,镍或其混合物,其中催化剂被施加到其中至少20重量%已经转化为锂铝尖晶石的氧化铝载体,液相是DELTA的混合物 4-四氢邻苯二甲酸酐和六氢邻苯二甲酸酐,其重量比为1:1至1:100。

    Isoxazolidine insecticides and fungicides
    6.
    发明授权
    Isoxazolidine insecticides and fungicides 失效
    异恶唑烷类杀虫剂和杀真菌剂

    公开(公告)号:US4681892A

    公开(公告)日:1987-07-21

    申请号:US834169

    申请日:1986-02-27

    摘要: Insecticidally, arachnicidally and fungicidally active novel isoxazolidines of the formula ##STR1## in which n is 2 or 3,R.sup.1 is H or alkyl,R.sup.2 is optionally substituted alkyl, cycloalkyl, alkenyl, alkinyl, aryl or a heterocyclic radical which is optionally substituted, andA is a di- or trivalent aryl or heteroaryl radical which is optionally substituted by alkyl, cycloalkyl, aralkyl, alkoxy, alkylthio, aryloxy, arylthio, halogen, CN, OH, halogenoalkyl, halogenoalkoxy, halogenoalkylthio, alkoxyalkyl, optionally halogen-substituted methylenedioxy or ethylenedioxy.Some of the intermediates are also new.

    摘要翻译: 杀虫剂,具有式(Ⅰ)的鸟苷酸和杀真菌活性新型异恶唑烷,其中n为2或3,R 1为H或烷基,R 2为任选取代的烷基,环烷基,烯基,炔基,芳基或任选取代的杂环基 并且A是任选被烷基,环烷基,芳烷基,烷氧基,烷硫基,芳氧基,芳硫基,卤素,CN,OH,卤代烷基,卤代烷氧基,卤代烷硫基,烷氧基烷基,任选被卤素取代的二价或三价芳基或杂芳基 亚甲二氧基或亚乙二氧基。 一些中间体也是新的。