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113 条记录 (耗时 0.036 秒)

    Process for the manufacture of 5-cyano-4-lower alkyl-oxazoles
    61.
    发明授权
    Process for the manufacture of 5-cyano-4-lower alkyl-oxazoles 失效
    制备5-氰基-4-低级烷基 - 恶唑的方法

    公开(公告)号：US5910594A

    公开(公告)日：1999-06-08

    申请号：US8793

    申请日：1998-01-20

    申请人： Klaus Behringer ,  Werner Bonrath ,  Horst Pauling

    发明人： Klaus Behringer ,  Werner Bonrath ,  Horst Pauling

    IPC分类号： B01J31/02 ,  C07B61/00 ,  C07D263/34 ,  C07D263/30 ,  C07D263/36 ,  C07D263/44

    CPC分类号： C07D263/34

    摘要： A process for the manufacture of a 5-cyano-4-lower alkyl-oxazole by the dehydration of a 5-carbamoyl-4-lower alkyl-oxazole is disclosed. The reaction is carried out by dehydrating the oxazole with silicon tetrachloride in the presence of an amine in an aprotic organic solvent. 5-Carbamoyl-4-methyl-oxazole may be dehydrated by the process in accordance with the invention to obtain 5-cyano-4-methyl-oxazole, which is a valuable intermediate in the synthesis of pyridoxine.

    摘要翻译： 公开了通过5-氨基甲酰基-4-低级烷基 - 恶唑脱水制备5-氰基-4-低级烷基恶唑的方法。 该反应通过在胺存在下在四氢呋喃中在非质子有机溶剂中脱水来进行。 5-氨基甲酰基-4-甲基恶唑可以通过本发明的方法脱水得到5-氰基-4-甲基恶唑，它是合成吡哆醇的有价值的中间体。

    Manufacture of gamma-delta-unsaturated ketones
    64.
    发明授权
    Manufacture of gamma-delta-unsaturated ketones 有权
    制造γ-δ-不饱和酮

    公开(公告)号：US08664450B2

    公开(公告)日：2014-03-04

    申请号：US13125083

    申请日：2009-09-28

    申请人： Fabrice Aquino ,  Werner Bonrath ,  Rolf Kuenzi

    发明人： Fabrice Aquino ,  Werner Bonrath ,  Rolf Kuenzi

    IPC分类号： C07C49/20

    CPC分类号： C07C45/511 ,  C07C49/203

    摘要： A process for the manufacture of gamma-delta-unsaturated ketones of formula (R1)(R2)C═CH—CH2—CH2—CO—R3 (I), wherein R1 is methyl or ethyl; R2 is a saturated or unsaturated linear or cyclic hydrocarbon residue and R3 is methyl or ethyl, by reacting a tertiary vinyl carbinol of formula (R1)(R2)C(OH)—CH═CH2 (II) with an isopropenyl methyl or ethyl ether of formula H3C—C(OR3)═CH2 (III) in the pre-sence of an ammonium salt as catalyst.

    摘要翻译： 制备式（R1）（R2）C = CH-CH2-CH2-CO-R3（Ⅰ）的γ-δ-不饱和酮的方法，其中R1是甲基或乙基; 通过使式（R1）（R2）C（OH）-CH = CH2（II）的叔乙烯基甲醇与异丙烯基甲基或乙基醚反应，R2是饱和或不饱和的直链或环状烃残基，R3是甲基或乙基 的式IIIC-C（OR3）= CH2（Ⅲ）的铵盐作为催化剂。