Preparation of .alpha.-substituted acrylamides
    72.
    发明授权
    Preparation of .alpha.-substituted acrylamides 失效
    α-取代丙烯酰胺的制备

    公开(公告)号:US4597907A

    公开(公告)日:1986-07-01

    申请号:US677309

    申请日:1984-12-03

    CPC分类号: C07C231/10 C07C249/08

    摘要: .alpha.-substituted acrylamides of the general formula I ##STR1## where R.sup.1 is a straight-chain, branched or cyclic alkyl radical of not more than 15 carbon atoms which can be unsubstituted or further substituted, are prepared by a process in which the corresponding .alpha.-substituted acrolein oximes are heated at from 40.degree. to 250.degree. C. in the presence of a copper(II) carboxylate.

    摘要翻译: 其中R 1是不大于15个碳原子的直链,支链或环状烷基,其可以是未取代的或进一步取代的通式Ⅰ的α-取代的丙烯酰胺,其中R1是可以被未取代或进一步取代的直链,支链或环状的烷基, 在羧酸铜(II)存在下,将相应的α-取代的丙烯醛肟在40-250℃下加热。

    Preparation of formaldehyde
    77.
    发明授权
    Preparation of formaldehyde 失效
    甲醛的制备

    公开(公告)号:US4354045A

    公开(公告)日:1982-10-12

    申请号:US221822

    申请日:1980-12-31

    摘要: Formaldehyde is prepared by dehydrogenation of methanol in the presence of a catalyst containing copper, zinc and tellurium, at from 300.degree. to 750.degree. C.The formaldehyde obtainable by the process of the invention is a disinfectant, tanning agent, reducing agent and valuable starting material for the preparation of synthetic resins, adhesives, plastics and auxiliaries in numerous sectors of industry.

    摘要翻译: 甲醛通过甲醇在含有铜,锌和碲的催化剂存在下在300℃至750℃下脱氢而制备。通过本发明方法获得的甲醛是消毒剂,鞣剂,还原剂和有价值的起始物 用于制造许多行业的合成树脂,粘合剂,塑料和助剂的材料。

    Process for the manufacture of mixtures of diphenylmethane diisocyanates
and polyphenyl polymethylene polyisocyanates
    78.
    发明授权
    Process for the manufacture of mixtures of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates 失效
    制备二苯基甲烷二异氰酸酯和聚苯基多亚甲基多异氰酸酯的混合物的方法

    公开(公告)号:US4349484A

    公开(公告)日:1982-09-14

    申请号:US197890

    申请日:1980-10-17

    CPC分类号: C07C263/04 C07C271/06

    摘要: A process for the production of mixtures of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates comprising the steps ofA. reacting aniline and an O-alkyl carbamate to form N-phenylurethanes;B. isolating the N-phenylurethanes;C. condensing, in the presence of an acid, the N-phenylurethanes with formaldehyde or bifunctional compounds having the formulaX--CH.sub.2 --X in which X stands for a RO--, RS-- or ROCO radical and R denotes an alkyl radical, to form mixtures of methylene bis(phenylurethanes) and polymethylene polyphenylurethanes;D. cleaving the mixtures of methylene bis(phenylurethanes) and polymethylene polyphenylurethanes at temperatures of 175.degree. C. to 600.degree. C.; andE. isolating the mixtures of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate resulting from step D.

    摘要翻译: 制备二苯基甲烷二异氰酸酯和聚苯基多亚甲基多异氰酸酯的混合物的方法,其包括以下步骤:A.使苯胺和氨基甲酸O-烷基酯反应形成N-苯基氨基甲酸酯; B.分离N-苯基氨基甲酸酯; C.在酸存在下,将N-苯基氨基甲酸酯与具有式X-CH 2 -X的甲醛或双官能化合物缩合,其中X代表RO-,RS-或ROCO基团,R表示烷基,至 形成亚甲基双(苯基氨基甲酸酯)和多亚甲基多苯基氨基甲酸酯的混合物; D.在175℃至600℃的温度下切割亚甲基双(苯基氨基甲烷)和多亚甲基多苯基氨基甲酸酯的混合物。 和E.分离由步骤D得到的二苯基甲烷二异氰酸酯和聚苯基多亚甲基多异氰酸酯的混合物。

    Preparation of .alpha.,.beta.-unsaturated nitriles
    79.
    发明授权
    Preparation of .alpha.,.beta.-unsaturated nitriles 失效
    制备α,β-不饱和腈

    公开(公告)号:US4315869A

    公开(公告)日:1982-02-16

    申请号:US143446

    申请日:1980-04-24

    IPC分类号: C07C255/34 C07C120/10

    CPC分类号: C07C255/00

    摘要: .alpha.,.beta.-Unsaturated nitriles are prepared by reacting an aldehyde with formamide in the presence of an acid and the presence or absence of a non-aromatic solvent to give an N-alkenyl-formamide, which is then passed, in the gas phase, over a dehydration catalyst at an elevated temperature.The nitriles obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents, plasticizers and drugs.

    摘要翻译: α,β-不饱和腈通过使醛与甲酰胺在酸的存在下和存在或不存在非芳族溶剂下反应制备,得到N-烯基 - 甲酰胺,然后在气相中通过, 在高温下脱水催化剂。 通过本发明的方法可获得的腈是用于制备染料,作物保护剂,增塑剂和药物的有价值的起始材料。