Process for synthesis of azacycloalkane-2,2-diphosponic acids
    22.
    发明授权
    Process for synthesis of azacycloalkane-2,2-diphosponic acids 失效
    氮杂环烷-2,2-二磷酸的合成方法

    公开(公告)号:US4876339A

    公开(公告)日:1989-10-24

    申请号:US322328

    申请日:1989-03-10

    IPC分类号: C07F9/553 C07F9/572 C07F9/59

    摘要: A reaction medium of ethanol condensed with 1-20, most preferably 4-6 moles, of ethylene or propylene oxide per mole of ethanol greatly improves the practicality of the preparation of azacycloalkane-2,2-diphosphonic acids of the general formula I: ##STR1## where R means a hydrogen or a lower alkyl radical with from 1 to 3 carbon atoms, and n means an integer between 3 and 11, by phosphonylating the corresponding lactams with phosphonic acid and phosphorous trihalides in the presence of water.

    摘要翻译: 每摩尔乙醇与1-20,最优选4-6摩尔乙烯或环氧丙烷缩合的乙醇的反应介质大大提高了制备通式I的氮杂环烷-2,2-二膦酸的实用性: (I)其中R表示氢或具有1至3个碳原子的低级烷基,n表示3至11之间的整数,通过在水存在下使膦酸和三卤化磷膦酸化相应的内酰胺。

    Process of stabilization of anhydrous dibasic calcium phosphate against
fluorine ions with azacycloalkane-2,2-diphosphonic acids
    26.
    发明授权
    Process of stabilization of anhydrous dibasic calcium phosphate against fluorine ions with azacycloalkane-2,2-diphosphonic acids 失效
    用氮杂环烷-2,2-二膦酸稳定无水磷酸氢钙与氟离子的工艺

    公开(公告)号:US4108961A

    公开(公告)日:1978-08-22

    申请号:US636736

    申请日:1975-12-01

    摘要: A process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions comprising treating an aqueous suspension of anhydrous dibasic calcium phosphate at a pH of from 5 to 10 with an azacycloalkane-2,2-diphosphonic acid of the formula ##STR1## wherein n is an integer from 3 to 5, or a water-soluble salt thereof, in an amount of from 0.01% to 5% by weight with reference to the anhydrous dibasic calcium phosphate; as well as tooth cleaning preparation containing the stabilized anhydrous dibasic calcium phosphate.RELATED ARTAnhydrous dibasic calcium phosphate having the formula CaHPO.sub.4 is a polishing substance frequently utilized in tooth cleaning preparations as, for example, toothpastes and powders. For this purpose it may be used alone or in admixture with other polishing substances as, for example, silica gel or plastics cleaning substances. If soluble fluorides or other compounds providing fluorine ions are added to these tooth cleaning preparations as anti-caries substances, the fluorine contained therein may be inactivated by conversion into the soluble and inactive calcium fluoride. The process thereby occurring may be represented by the following empirical reaction:CaHPO.sub.4 + 2 NaF .fwdarw. CaF.sub.2 + Na.sub.2 HPO.sub.4the speed of this inactivation reaction is influenced by several circumstances such as temperature, pH value of the mixture and its composition.For the use of a polishing agent as cleaning material in toothcleaning preparations, its abrasive behavior is of decisive importance, since products to be used for this purpose must only have an abrasive power which does not cause damage to the teeth. Owing to its favorable abrasive behavior, anhydrous dibasic calcium phosphate already enjoys great popularity as a cleaning material in tooth cleaning preparations. Its property of making the fluorine-containing compounds used for control of caries in the tooth cleaning preparation inactive or at least strongly reducing their action is, however, extremely undesirable. The problem, therefore, exists of finding ways and means largely to stop this inactivation of the fluorine-containing added substances.OBJECTS OF THE INVENTIONAn object of the present invention is the development of a process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions consisting essentially of suspending anhydrous dibasic calcium phosphate in an aqueous medium at a pH of from 5 to 10, containing from 0.01% to 5% by weight based on the content of dibasic calcium phosphate of an azacycloalkane-2,2-diphosphonic compound selected from the group consisting of (A) compounds of the formula ##STR2## wherein n is an integer from 3 to 5, and (B) water-soluble salts thereof, and separating said stabilized anhydrous dibasic calcium phosphate.Another object of the present invention is the obtaining of a stabilized anhydrous dibasic calcium phosphate.A further object of the present invention is the obtaining of tooth cleaning preparations containing a stabilized anhydrous dibasic calcium phosphate.These and other objects of the present invention will become more apparent as the description thereof proceeds.

    摘要翻译: 一种用于稳定无水磷酸氢钙与氟离子反应的方法,其包括用pH为5至10的无水磷酸氢钙的水性悬浮液,用式为“IMAGE”的氮杂环烷-2,2-二膦酸