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    • 3. 发明申请
    • Process for preparing alkyl- or aryloxyacetaldehydes
    • 制备烷基或芳氧基乙醛的方法
    • US20010053852A1
    • 2001-12-20
    • US09897390
    • 2001-07-03
    • Karlheinz GiselbrechtRudolf Hermanseder
    • C07D237/02C07C045/42
    • C07C45/56C07C47/198C07C47/277
    • A process for preparing alkyl- or aryloxyacetaldehydes of the formula 1 where R can be an unsubstituted or mono- or polysubstituted alkyl, aryl, heteroaryl, alkaryl, alkylheteroaryl or aralkyl radical or an unsubstituted or mono- or polysubstituted heterocycle or alkyl heterocycle, which comprises reacting a compound of the formula RnullOMnullnull(II) where R is as defined above and M can be an alkali metal atom or an alkaline earth metal atom, with a compound of the formula 2 where R1 and R2 independently of one another are a C1-C6-alkyl radical or together are a C2-C6-alkylene radical and X is a halogen atom, to form the corresponding dialkylacetal of the formula 3 where R, R1 and R2 are as defined above, whereupon acetal cleavage is carried out to give the desired alkyl- or aryloxyacetaldehydes of the formula (I).
    • 制备下式的烷基 - 或芳氧基乙醛的方法,其中R可以是未取代的或单取代或多取代的烷基,芳基,杂芳基,烷芳基,烷基杂芳基或芳烷基或未取代或单取代或多取代的杂环或烷基杂环, 式(I)所示的化合物,其中R如上定义,M可以是碱金属原子或 碱土金属原子与下式的化合物反应,其中R 1和R 2彼此独立地为C 1 -C 6烷基或一起为C 2 -C 6亚烷基,X为卤素原子,形成相应的二烷基缩醛 其中R,R 1和R 2如上所定义,由此进行缩醛裂解,得到所需的式(I)的烷基 - 或芳氧基乙醛,