Process for preparation of fluorinated hydrocarbons
    43.
    发明授权
    Process for preparation of fluorinated hydrocarbons 失效
    氟化烃的制备方法

    公开(公告)号:US5770779A

    公开(公告)日:1998-06-23

    申请号:US778427

    申请日:1997-01-02

    CPC分类号: C07C17/206 C07C17/21

    摘要: This invention is a process for the selective preparation of fluorinated hydrocarbons from chlorinated hydrocarbons while minimizing formation of oligomeric and polymeric byproducts. The process comprises providing a liquid phase containing chlorinated hydrocarbon, HF, a tin catalyst, and at least one compound selected from the group consisting of metal and nonmetal alkoxides, and heating the mixture and isolating the fluorinated hydrocarbon formed.

    摘要翻译: 本发明是一种从氯化烃中选择性制备氟化烃的方法,同时最小化低聚物和聚合副产物的形成。 该方法包括提供含有氯化烃,HF,锡催化剂和至少一种选自金属和非金属醇盐的化合物的液相,并加热混合物并分离形成的氟化烃。

    .beta.-aminovinyl ketones, a preparation process and their use in the
preparation of .beta.-diketones
    45.
    发明授权
    .beta.-aminovinyl ketones, a preparation process and their use in the preparation of .beta.-diketones 失效
    β-氨基乙烯基酮,其制备方法及其在制备β-二酮中的应用

    公开(公告)号:US5684206A

    公开(公告)日:1997-11-04

    申请号:US569266

    申请日:1996-03-20

    摘要: Novel .beta.-aminovinyl ketones of the general formula ##STR1## wherein R.sup.1 is, in particular, an alkenyl, alkynyl, cycloalkyl or cycloalkenyl group; R.sup.2 is, in particular, an electron-attracting substituent such as nitro, acyl, ester, alkylthio, carbamoyl, thiocarbamoyl or haloalkyl; R.sup.3 is, in particular, an alkyl or alkoxy group or a halogen atom; n is 1 or 2 and m is 0, 1, 2 or 3. A method for preparing such compounds by carrying out a condensation reaction between ketone R.sup.1 --CO--CH.sub.3 and, in particular, benzonitrile substituted by (R.sup.2).sub.n and optionally (R.sup.3).sub.m, in the presence of a strong base, as well as a process employing said .beta.-aminovinyl ketones of general formula (VI) for preparing the corresponding .beta.-diketones, are also disclosed.

    摘要翻译: PCT No.PCT / FR94 / 00726 Sec。 371日期:1996年3月20日 102(e)1996年3月20日PCT 1994年6月16日PCT公布。 公开号WO95 / 00476 日期1995年1月5日通式(VI)的新型β-氨基乙烯基酮其中R 1特别是烯基,炔基,环烷基或环烯基; R2特别是吸电子取代基如硝基,酰基,酯,烷硫基,氨基甲酰基,硫代氨基甲酰基或卤代烷基; R3特别是烷基或烷氧基或卤素原子; n为1或2,m为0,1,2或3.通过进行酮R1-CO-CH3之间的缩合反应,特别是被(R 2)n取代的苄腈和任选( R3)m,在存在强碱的情况下,以及采用通式(VI)的β-氨基乙烯基酮制备相应的β-二酮的方法也被公开。

    Method for the preparation of difluoromethane
    49.
    发明授权
    Method for the preparation of difluoromethane 失效
    二氟甲烷的制备方法

    公开(公告)号:US5495057A

    公开(公告)日:1996-02-27

    申请号:US398965

    申请日:1995-03-02

    CPC分类号: C07C17/206

    摘要: There is disclosed a method for the preparation of difluoromethane wherein methylene chloride is reacted with. hydrogen fluoride in liquid phase, at a temperature of about 70.degree. to 90.degree. C. under a pressure of about 11 to 12 kg/cm.sup.2.g in the presence of antimony pentachloride. It is important that the concentration of quinquevalent antimony is maintained at a level of 85% or more with the feed mole ratio of hydrogen fluoride to methylene chloride ranging from about 2.0 to 2.3.Applicable to industrial scale, the method is operated in a batch system or in a continuous system. In addition, it exhibits superior conversion rate of the materials and production yield.

    摘要翻译: 公开了二氯甲烷与二氯甲烷反应制备二氟甲烷的方法。 氟化氢在液相中,在约70至90℃的温度下,在约11至12kg / cm 2的压力下,在五氯化锑存在下。 重要的是,将氟化氢与二氯甲烷的进料摩尔比在约2.0至2.3范围内,将五价锑的浓度保持在85%或更高的水平。 适用于工业规模,该方法以批量系统或连续系统运行。 此外,它表现出优异的材料转化率和产量。

    .delta..sup.1,4 -pregnadiene-3,20-diones
    50.
    发明授权
    .delta..sup.1,4 -pregnadiene-3,20-diones 失效
    δ1,4-孕二烯-3,20-二酮

    公开(公告)号:US5434258A

    公开(公告)日:1995-07-18

    申请号:US190881

    申请日:1994-02-02

    CPC分类号: C07J71/0031 C07J5/0092

    摘要: A compound of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, acyl of an organic carboxylic acid of 1 to 8 carbon atoms, allyloxycarbonyl, alkoxycarbonyl and aralkoxycarbonyl of up to 8 carbon atoms and alkylsulfonyl and arylsulfonyl of up to 8 carbon atoms and their use to prepare substituted 16,17-methylenedioxy-steroids and novel intermediates.

    摘要翻译: 式Ⅰ化合物,其中R选自氢,碳原子数1〜8的有机羧酸的酰基,高达8个碳原子的烷氧羰基和芳烷氧基羰基,烷基磺酰基和芳基磺酰基 至8个碳原子,并用于制备取代的16,17-亚甲二氧基类固醇和新型中间体。