Process for preparing ionones
    3.
    发明授权
    Process for preparing ionones 失效
    紫罗兰酮的制备方法

    公开(公告)号:US6140542A

    公开(公告)日:2000-10-31

    申请号:US147262

    申请日:1998-11-13

    CPC分类号: C07C403/16 C07C2101/16

    摘要: Process for the continuous preparation of .alpha.- and/or .beta.-ionone or homologous compounds using concentrated sulfuric acid at temperatures from 20 to 90.degree. C., in the presence of organic solvents or diluents with cooling and by subsequent termination of the reaction by hydrolysis of the reaction mixture with water or dilute sulfuric acid, wherein both the cyclization of pseudoionones and the subsequent hydrolysis of the reaction mixture are carried out in a virtually adiabatic reaction in one or more reaction mixing pump(s) which are connected in series and each of which consists essentially of a rotationally symmetrical mixing chamber formed from a peripheral wall and two end walls and of a mixing rotor made of material inert to sulfuric acid and with rotational drive, where the mixing chamber has at least one inlet opening for each component and one outlet opening for the reaction mixture, and annular channels in fluid connection to one another in the end walls, and wherein the heat of the two reactions is in each case partly or wholly removed with the aid of a downstream heat exchanger.

    摘要翻译: PCT No.PCT / EP97 / 02249 Sec。 371日期:1998年11月13日 102(e)1998年11月13日日期PCT提交1997年5月2日PCT公布。 出版物WO97 / 43254 日期1997年11月20日使用浓硫酸在20〜90℃的温度下连续制备α-和/或β-戊二酮或同系化合物的方法,在有机溶剂或稀释剂存在下进行冷却和后续终止 反应混合物与水或稀硫酸水解反应,其中假戊烯酮的环化和随后的反应混合物的水解都在一个或多个反应混合泵中实质上绝热的反应中进行,所述反应混合泵是 串联连接,每个主要由旋转对称的混合室组成,该混合室由周壁和两个端壁以及由硫酸惰性且具有旋转驱动的材料制成的混合转子,其中混合室具有至少一个入口 用于每个部件的开口和用于反应混合物的一个出口开口,以及在端壁中彼此流体连接的环形通道 ,并且其中两个反应的热量在每种情况下都借助于下游热交换器部分或全部去除。

    Reductive method for preparation of macrocyclic oligomer mixtures
    5.
    发明授权
    Reductive method for preparation of macrocyclic oligomer mixtures 失效
    制备大环低聚物混合物的还原法

    公开(公告)号:US5530090A

    公开(公告)日:1996-06-25

    申请号:US419565

    申请日:1995-04-10

    申请人: Farid F. Khouri

    发明人: Farid F. Khouri

    CPC分类号: C08G73/1021 C07B37/10

    摘要: Macrocyclic oligomer mixtures, particularly polyimide oligomer mixtures, are prepared by the treatment of a dihalo-substituted organic compound or the like under reducing conditions, preferably by a complex of a zerovalent Group VIII metal. Cyclization takes place by reductive dehalogenation.

    摘要翻译: 大环低聚物混合物,特别是聚酰亚胺低聚物混合物,通过在还原条件下优选用零价Ⅷ族金属络合物处理二卤代取代的有机化合物等来制备。 通过还原性脱卤进行环化。

    Palladium catalyzed akylative cyclization useful in syntheses of Vitamin
D and analogues
    7.
    发明授权
    Palladium catalyzed akylative cyclization useful in syntheses of Vitamin D and analogues 失效
    钯催化的烷基环化可用于维生素D和类似物的合成

    公开(公告)号:US5446225A

    公开(公告)日:1995-08-29

    申请号:US173172

    申请日:1993-12-23

    摘要: An alkylative cycloaddition method is provided that is particularly useful for the synthesis of many of the Vitamin D analogues with differing side chains. Thus, a preferred synthesis is of Vitamin D analogues having a side chain R.sub.1 where a first precursor having the structure ##STR1## with X being a halide or a pseudo halide, and a second precursor are provided, the second precursor being a 1,7 enyne. These precursors are reacted in the presence of a palladium catalyst to form compounds having the structure ##STR2## where R.sub.2 is hydrogen, hydroxyl, lower alkoxy, fluorine, or a protecting group, and R.sub.3 is hydrogen, hydroxyl, lower alkoxy, fluorine, or a protecting group.

    摘要翻译: 提供了对于合成具有不同侧链的许多维生素D类似物特别有用的烷基环加成方法。 因此,优选的合成是具有侧链R1的维生素D类似物,其中提供具有X为卤化物或假卤化物的结构的第一前体和第二前体,第二前体为1,7 恩乃恩 这些前体在钯催化剂的存在下反应形成具有结构的化合物,其中R2是氢,羟基,低级烷氧基,氟或保护基,R3是氢,羟基,低级烷氧基,氟或 一个保护组。