Pyramidal liquid crystals
    1.
    发明公开
    Pyramidal liquid crystals 失效
    金字塔形液晶

    公开(公告)号:EP0350842A3

    公开(公告)日:1990-05-16

    申请号:EP89112598.1

    申请日:1989-07-10

    申请人: MONTEDISON S.p.A.

    IPC分类号: C09K19/32 C07C69/33 C07C69/92

    摘要: Dodeca-substituted derivatives of macrocyclic tetramers, obtained by acid-catalyzed condensation of pyrogallol and an aliphatic aldehyde, wherein the substituents are alkanoyl groups, are described. These substituted tetramers are optically anisotropic in the molten state and, in particular, show mesophases of the pyramidal type.

    摘要翻译: 描述了通过邻苯三酚和脂肪族醛的酸催化缩合获得的大环四聚体的十二烷基取代的衍生物,其中取代基是烷酰基。 这些取代的四聚体在熔融状态下是光学各向异性的,并且特别是显示金字塔型的中间相。

    Process for the preparation of 2-Alkyl-Cyclopent-2-Enones
    5.
    发明公开
    Process for the preparation of 2-Alkyl-Cyclopent-2-Enones 失效
    Verfahren zur Herstellung von 2-烷基 - 环戊-2-烯酮。

    公开(公告)号:EP0194144A2

    公开(公告)日:1986-09-10

    申请号:EP86301568.1

    申请日:1986-03-05

    申请人: Montedison S.p.A.

    发明人: Dalcanale, Enrico

    摘要: The invention relates to a process for the preparation of 2-alkyl-cyclopent-2-enones of formula
    by the following steps. 1) An a-olefin of formula CH 2 =CH--CH 2 R is oxidized to the corresponding epoxide. 2) The epoxide is reacted with an alkylating agent of formula Na + (CH-(COOR") 2 ]- wherein R" is an ethyl, isopropyl or isobutyl radical, to obtain an α-carbalkoxy-γ-alkyl lactone. 3) The lactone is saponified to obtain the corresponding acid. 4) The acid is decarboxylated to obtain a γ-alkyl lactone of formula:
    5) The γ-alkyl lactone is reacted with a protic acid to thereby obtain, by cyclization, a 2-alkyl-cyclopent-2-enone of formula (I).

    摘要翻译: 本发明涉及通过以下步骤制备式... 的2-烷基 - 环戊-2-烯酮的方法。 1)将式CH 2 = CH-CH 2 R的α-烯烃氧化成相应的环氧化物。 2)将环氧化物与式Na + [CH(COOR sec)2]]和烷基化烷基化剂反应,其中R sec是乙基,异丙基或异丁基,得到α-碳烷氧基-γ-烷基内酯。 3)将内酯皂化,得到相应的酸。 4)将酸脱羧以得到下式的γ-烷基内酯:... 5)将γ-烷基内酯与质子酸反应,由此通过环化得到2-烷基 - 环戊-2-烯 式(I)的烯酮。

    Pyramidal liquid crystals
    6.
    发明公开
    Pyramidal liquid crystals 失效
    PyramidenförmigeFlüssigkristalle。

    公开(公告)号:EP0350842A2

    公开(公告)日:1990-01-17

    申请号:EP89112598.1

    申请日:1989-07-10

    申请人: MONTEDISON S.p.A.

    IPC分类号: C09K19/32 C07C69/33 C07C69/92

    摘要: Dodeca-substituted derivatives of macrocyclic tetramers, obtained by acid-catalyzed condensation of pyrogallol and an aliphatic aldehyde, wherein the substituents are alkanoyl groups, are described.
    These substituted tetramers are optically anisotropic in the molten state and, in particular, show mesophases of the pyramidal type.

    摘要翻译: 描述了通过邻苯三酚和脂族醛的酸催化缩合获得的十二烷取代的大环四聚体衍生物,其中取代基是烷酰基。 这些取代的四聚体在熔融状态下是光学各向异性的,特别是显示锥体型的中间相。