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    • 5. 发明授权
    • Process for preparing .alpha., .beta.-unsaturated aldehydes
    • 制备α,β-不饱和醛的方法
    • US4745229A
    • 1988-05-17
    • US15095
    • 1987-02-13
    • Junzo OteraShigeaki SuzukiTakashi OnishiYoshiji Fujita
    • Junzo OteraShigeaki SuzukiTakashi OnishiYoshiji Fujita
    • C07C45/27C07C45/28C07C45/56C07C47/21C07C69/145
    • C07C47/21C07C45/27C07C45/28C07C45/56C07C67/29
    • A process for preparing .alpha.,.beta.-unsaturated aldehydes of the general formula (I) ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are independently a hydrogen atom, or an alkyl or alkenyl group with or without being substituted with a lower acyloxy group. The aldehyde of the general formula (I) is prepared by reaction between an allylic chloride of the following general formula (IIa) ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 have, respectively, the same meanings as defined above, and an amine oxide selected from the group consisting of tri(lower alkyl)amine N-oxides of the formula,R.sub.3.sup.4 N.sup.+ O.sup.-,in which R.sup.4 represents a lower alkyl group having from 2 to 4 carbon atoms, and N-lower alkylmorpholine N-oxides of the following formula ##STR3## in which R.sup.5 represents a lower alkyl group having from 1 to 4 carbon atoms. Alternatively, the aldehyde of the formula (I) is obtained by reaction between an allylic chloride of the following general formula (IIb) ##STR4## in which R.sup.1, R.sup.2 and R.sup.3 have, respectively, the same meanings as defined above, and an amine oxide selected from the group consisting of tri(lower alkyl)amine N-oxides of the formula,R.sub.3.sup.4 N.sup.+ O.sup.-,in which R.sup.4 has the same meaning as defined above, and N-lower alkylmorpholine N-oxides of the following formula ##STR5## in which R.sup.5 has the same meaning as defined above, in the presence of an alkali metal iodide or a copper halide.
    • 制备通式(I)的α,β-不饱和醛的方法,其中R 1,R 2和R 3独立地为氢原子,或具有或不具有低级烷基或烯基的烷基或烯基 酰氧基。 通式(I)的醛通过以下通式(IIa)的烯丙基氯与其中R 1,R 2和R 3分别具有与上述相同的含义和 选自下列的三(低级烷基)胺N-氧化物的氧化胺,其中R 4表示具有2至4个碳原子的低级烷基的式R 34 N + O-,和N-低级烷基吗啉N- 下式“IMAGE”的氧化物,其中R 5表示具有1至4个碳原子的低级烷基。 或者,式(I)的醛通过以下通式(IIb)的烯丙基氯(IIb)(其中R1,R2和R3分别具有与上述相同的含义) 和选自下式的三(低级烷基)胺N-氧化物的氧化胺,其中R 4具有与上述相同的含义的R 34 N + O-,以及下述的N-低级烷基吗啉N-氧化物 在碱金属碘化物或卤化铜存在下,其中R 5具有与上述相同的含义的式“IMAGE”。