Osmium catalyzed organic hydroperoxide hydroxylation of olefinic
compounds
    2.
    发明授权
    Osmium catalyzed organic hydroperoxide hydroxylation of olefinic compounds 失效
    锇催化有机氢过氧化物的烯烃化合物羟基化

    公开(公告)号:US4049724A

    公开(公告)日:1977-09-20

    申请号:US620436

    申请日:1975-10-07

    IPC分类号: C07D307/89 C11C1/00 C07C29/02

    摘要: Method for preparing polyols such as diols and triols by the homogeneous catalytic hydroxylation of an olefinic compound by contacting the olefinic compound with an organic hydroperoxide in an aqueous solution at an initial pH above 8 in the presence of a catalytic amount of a water soluble osmium compound as the catalyst.

    摘要翻译: 通过在催化量的水溶性锇化合物的存在下,在初始pH高于8的水溶液中使烯属化合物与有机氢过氧化物接触,通过烯烃化合物的均相催化羟基化制备多元醇如二醇和三醇的方法 作为催化剂。

    Preparation of polyisocyanates from polycarbamates
    3.
    发明授权
    Preparation of polyisocyanates from polycarbamates 失效
    从聚氨基甲酸酯制备聚异氰酸酯

    公开(公告)号:US4287132A

    公开(公告)日:1981-09-01

    申请号:US191543

    申请日:1980-09-29

    CPC分类号: C07C263/04

    摘要: In the process of producing a diisocyanate comprising(a) condensing and rearranging alkyl phenylcarbamate and formaldehyde under acidic conditions to form dialkyl methylene bis(phenylcarbamate) and(b) thermally decomposing the dialkyl methylene bis(phenylcarbamate) to diphenylmethane diisocyanate,the improvement comprises prior to step (b) treating the reaction product of (a) by first distilling the reaction product of (a) under reduced pressure at a temperature below 120.degree. C. until all solvent is removed and 65-85% of the unreacted alkyl phenylcarbamate present is removed, discontinuing the distillation, adding a polar solvent to undistilled distillation residue and selectively crystallizing and separating dialkyl methylene bis(phenylcarbamate) from the distillation residue.

    摘要翻译: 在制备二异氰酸酯的方法中,(a)在酸性条件下使苯基氨基甲酸烷基酯和甲醛缩合并重排,形成二烷基亚甲基双(苯基氨基甲酸酯)和(b)将二烷基亚甲基双(苯基氨基甲酸酯)热分解成二苯基甲烷二异氰酸酯, (b)处理(a)的反应产物,首先在低于120℃的温度下在减压下蒸馏(a)的反应产物,直至除去所有溶剂,并将65-85%的未反应的烷基苯基氨基甲酸铵存在 ,停止蒸馏,向未蒸馏残余物中加入极性溶剂,并选择性地从蒸馏残余物中结晶并分离二烷基亚甲基双(苯基氨基甲酸酯)。