Production of cyclopentenones by enzyme resolution
    2.
    发明授权
    Production of cyclopentenones by enzyme resolution 失效
    通过酶分解制备环戊烯酮

    公开(公告)号:US4957867A

    公开(公告)日:1990-09-18

    申请号:US055362

    申请日:1987-05-29

    IPC分类号: C12P7/42 C12P7/62

    CPC分类号: C12P7/42 C12P7/62

    摘要: A process for preparing an optically active cyclopentenone of the formula: ##STR1## wherein R is a hydrogen atom or a lower alkyl group and n is an integer of 4 to 8, which comprises contacting a dl-cyclopentenone ester of the formula: ##STR2## wherein R and n are each as defined above and R' is a lower alkyl group optionally substituted with halogen on an enzyme having a capability of hydrolyzing selectively either one of the d- or l-form isomer in the dl-cyclopentenone ester (II) in an aqueous medium for asymmetric hydrolysis.

    摘要翻译: 一种制备下式的光学活性环戊烯酮的方法:其中R是氢原子或低级烷基,n是4至8的整数,其包括使下式的dl-环戊烯酮与式 (II)其中R和n各自如上所定义,R'是任选被卤素取代的低级烷基,该酶具有选择性地水解d-或l-型异构体中的任一种的能力 dl-环戊烯酮酯(II)在不溶性水解的水性介质中。

    Method for inversion of optically active 4-hydroxy-2-cyclopentenones
    4.
    发明授权
    Method for inversion of optically active 4-hydroxy-2-cyclopentenones 失效
    光学活性4-羟基-2-环戊烯酮的反转方法

    公开(公告)号:US4683323A

    公开(公告)日:1987-07-28

    申请号:US758801

    申请日:1985-07-25

    摘要: By hydrolyzing a sulfonic acid ester or a nitric acid ester of an optically active 4-hydroxy-2-cyclopentenone, the steric inversion of the hydroxyl group at the 4-position of the cyclopentenone mentioned above is effected.4-hydroxy-2-cyclopentenone is useful as a raw material of prostaglandins (natural substance is an (R)-substance) having stimulative action to uterine muscle and vasodilator action. For instance, 4(S)-hydroxy-2-cyclopentenone can be configurationally inverted to R-isomer. Accordingly, this method is extremely meaningful in the synthesis of prostaglandins.

    摘要翻译: 通过水解光学活性的4-羟基-2-环戊烯酮的磺酸酯或硝酸酯,可以实现上述环戊烯酮在4-位的羟基的立体倒置。 4-羟基-2-环戊烯酮可用作具有对子宫肌肉和血管扩张剂作用的刺激作用的前列腺素(天然物质是(R))的原料。 例如,可以将4(S) - 羟基-2-环戊烯酮构型反转成R-异构体。 因此,这种方法在前列腺素的合成中是非常有意义的。

    Process for preparing optically active 4-hydroxy-2-cyclopentenones
    5.
    发明授权
    Process for preparing optically active 4-hydroxy-2-cyclopentenones 失效
    光学活性4-羟基-2-环戊烯酮的制备方法

    公开(公告)号:US4714782A

    公开(公告)日:1987-12-22

    申请号:US700890

    申请日:1985-02-12

    摘要: A process for preparing an optically active 2-substituted or unsubstituted-4-hydroxy-2-cyclopentenone of the formula: ##STR1## wherein R is a hydrogen atom, an allyl group or a propargyl group, which comprises reacting the corresponding 2-substituted or unsubstituted-4-hydroxy-2-cyclopentenone of the formula: ##STR2## wherein R is defined above with a lactone chosen from (1R,5S)-6,6-dimethyl-4-hydroxy-3-oxabicyc lo[3.1.0]hexan-2-one or (1S,5R)-6,6-dimethyl-4-hydroxy-3-oxabicyclo[3.1.0]hexan-2-one in a molar ratio of 1.5 - 2:1 in the presence of p-toluenesulfonic acid or benzenesulfonic acid in the coexistence of an organic solvent under elimination of water as an azeotropic mixture with the organic solvent to obtain a reaction mixture comprising (1R,5S)-6,6-dimethyl-3-oxa-4(R)-[1(R)-4-oxo-2-substituted or unsubstituted-2-cyclopentenyloxy]bicyclo[3.1.0]hexan-2-one or (1S,5R)-6,6-dimethyl-3-oxa-4(S)-[1(S)-4-oxo-2-substituted or unsubstituted-2-cyclopentenyloxy]bicyclo[3.1.0]hexan-2-one of the formula: ##STR3## wherein R is as defined above, of which either one isomer is contained in a considerably larger amount than the other isomer, separating the isom er having the larger content from the reaction mix ture and hydrolyzing the separated isomer to give the optically active 2-substituted or unsubstituted-4-hydrox y-2-cyclopentenone.

    摘要翻译: 制备下式的光学活性2-取代或未取代的4-羟基-2-环戊烯酮的方法:其中R是氢原子,烯丙基或炔丙基,其包括使相应的2-取代的 或下式所示的未取代的4-羟基-2-环戊烯酮:其中R定义如上,其中内酯选自(1R,5S)-6,6-二甲基-4-羟基-3-氧杂双环[3.1。 0]己-2-酮或(1S,5R)-6,6-二甲基-4-羟基-3-氧杂双环[3.1.0]己烷-2-酮,其摩尔比为1.5-2:1 的对甲苯磺酸或苯磺酸在与有机溶剂的共沸混合物中除去水作为有机溶剂共存,得到包含(1R,5S)-6,6-二甲基-3-氧杂-4 (R) - [1(R)-4-氧代-2-取代或未取代的-2-环戊烯氧基]双环[3.1.0]己-2-酮或(1S,5R)-6,6-二甲基-3- 氧杂-4(S) - [1(S)-4-氧代-2-取代或未取代的-2-环戊烯氧基]双环[3.1.0]己-2-酮 其中R如上所定义,其中一种异构体的含量比其他异构体大得多,从反应混合物中分离具有较大含量的等分子并水解分离的异构体,得到 光学活性的2-取代或未取代的-4-羟基-2-环戊烯酮。

    HEAD-SLIDER INCLUDING THIN-FILM MAGNETIC-RECORDING HEAD HAVING REDUCED THERMAL PROTRUSION
    7.
    发明申请
    HEAD-SLIDER INCLUDING THIN-FILM MAGNETIC-RECORDING HEAD HAVING REDUCED THERMAL PROTRUSION 有权
    包括具有减少热导率的薄膜磁记录头的头部滑盖

    公开(公告)号:US20110116192A1

    公开(公告)日:2011-05-19

    申请号:US12642739

    申请日:2009-12-18

    IPC分类号: G11B5/60

    摘要: A head-slider. The head-slider includes a slider, and a thin-film magnetic-recording head. The thin-film magnetic-recording head includes: a read element; a write element; a non-magnetic insulating protective layer disposed around both read and write elements; a resist disposed at a position further away from an air-bearing surface than the read element; and, a hard-material member including a material selected from the group consisting of silicon carbide and tungsten, which is disposed at a position further away from the air-bearing surface than the read element and the write element. Both an end of the resist and an end of the hard-material member overlap the write element when viewed in a stacking direction. A ratio of a distance from the air-bearing surface to a deepest end of the hard-material member to a distance from the air-bearing surface to a deepest end of the resist is at least 0.9.

    摘要翻译: 头滑块。 磁头滑动器包括滑块和薄膜磁记录头。 薄膜磁记录头包括:读取元件; 写元素 设置在读取和写入元件周围的非磁性绝缘保护层; 设置在远离所述读取元件的空气轴承表面的位置处的抗蚀剂; 以及包括选自碳化硅和钨的材料的硬质材料构件,其被设置在比读取元件和写入元件更远离空气轴承表面的位置处。 当在堆叠方向上观察时,抗蚀剂的一端和硬质材料构件的一端与写入元件重叠。 从空气轴承表面到硬质材料构件的最深端的距离与从空气轴承表面到抗蚀剂的最深端的距离的比率至少为0.9。

    Purification of .beta.-naphthol
    10.
    发明授权
    Purification of .beta.-naphthol 失效
    纯化{62-萘酚

    公开(公告)号:US4021495A

    公开(公告)日:1977-05-03

    申请号:US588117

    申请日:1975-06-18

    CPC分类号: C07C37/84

    摘要: A process for purifying crude .beta.-naphthol obtained via an alkylnaphthalene hydroperoxide, comprising subjecting the crude .beta.-naphthol to a recrystallization treatment using (1) an aliphatic or alicyclic hydrocarbon solvent having 5 to 10 carbon atoms, or (2) a mixed solvent comprising the aliphatic or alicyclic hydrocarbon solvent and at least one other solvent selected from the group consisting of benzene, a benzene derivative, a ketone, an alcohol, an ether and an ester.

    摘要翻译: 一种纯化通过烷基萘氢过氧化物得到的粗β-萘酚的方法,包括使用(1)具有5至10个碳原子的脂族或脂环族烃溶剂对粗β-萘酚进行重结晶处理,或(2)包含 脂族或脂环烃溶剂和选自苯,苯衍生物,酮,醇,醚和酯的至少一种其它溶剂。