Cephalosporin derivatives
    3.
    发明授权
    Cephalosporin derivatives 失效
    头孢菌素衍生物

    公开(公告)号:US4086341A

    公开(公告)日:1978-04-25

    申请号:US707853

    申请日:1976-07-22

    摘要: Penicillin and cephalosporin derivatives characterized by the presence of a nitroalkyl, nitrocycloalkyl, nitrophenylalkyl or nitroanilinoalkyl group in the side chain are antibacterial agents. The compounds, of which 6-(2-nitro-3,3-dimethylbutyrylamido)-penicillanic acid, 7-nitroacetamido-3-methyl-ceph-3-em-4-carboxylic acid, and 6-[D-.alpha.-(2-nitro-2-methylpropionylamido)phenylacetamido]-penicillanic acid are typical embodiments, are prepared by reacting 6-amino-penicillanic acid, 7-amino-cephalosporanic acid (or derivative thereof) or an .alpha.-substituted-.alpha.-amino-acetamido-penicillanic acid with an appropriate nitrated carboxylic acid or an equivalent nitrated acylating agent.

    摘要翻译: 特征在于在侧链中存在硝基烷基,硝基环烷基,硝基苯基烷基或硝基苯胺基烷基的青霉素和头孢菌素衍生物是抗菌剂。 其中6-(2-硝基-3,3-二甲基丁酰氨基) - 青霉烷酸,7-硝基乙酰胺基-3-甲基 - 头孢-3-烯-4-羧酸和6- [D-α - ( 2-硝基-2-甲基丙酰胺基)苯乙酰氨基] - 青霉烷酸是典型的实施方案,通过6-氨基 - 青霉烷酸,7-氨基 - 头孢烷酸(或其衍生物)或α-取代-α-氨基 - 乙酰氨基 - 适当的硝酸羧酸或等同的硝化酰化剂。

    Process for the production of cellular polyurethane elastomers
    5.
    发明授权
    Process for the production of cellular polyurethane elastomers 失效
    生产细胞聚氨酯弹性体的方法

    公开(公告)号:US4280007A

    公开(公告)日:1981-07-21

    申请号:US147905

    申请日:1980-05-08

    摘要: The instant invention is directed to a process for the production of a cellular polyurethane elastomer having a density of 0.45 to 0.8 g/cm.sup.3, comprising:(a) preparing a prepolymer having an isocyanate content of 10 to 25% by weight from aromatic polyisocyanates and a portion of one or more polyhydroxyl compounds having a molecular weight of from 400 to 6,000; and(b) reacting said prepolymer with the remainder of said polyhydroxyl compound and water;wherein the quantity of said water is 0.3 to 1% by weight and the equivalent ratio of isocyanate groups to isocyanate reactive compounds is in the range of 0.95:1 to 1.1:1, characterized in that from 0.1 to 0.8% by weight, based on the whole reaction mixture, of aromatic diprimary diamines having a molecular weight from 108 to 500 are also used in (a) or (b).

    摘要翻译: 本发明涉及一种生产密度为0.45至0.8g / cm 3的多孔聚氨酯弹性体的方法,包括:(a)制备异氰酸酯含量为芳族多异氰酸酯为10至25重量%的预聚物和 一部分一种或多种分子量为400至6000的多羟基化合物; 和(b)使所述预聚物与剩余的所述多羟基化合物和水反应; 其中,所述水的量为0.3〜1重量%,异氰酸酯基与异氰酸酯反应性化合物的当量比在0.95:1〜1.1:1的范围内,其特征在于,以0.1〜0.8重量% (a)或(b)也使用分子量为108-500的芳族二元二胺的整个反应混合物。