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    • 3. 发明授权
    • Process for the preparation of oxalyl chloride
    • 草酰氯的制备方法
    • US4341720A
    • 1982-07-27
    • US247186
    • 1981-03-24
    • Axel VogelGuido SteffanKarl MannesViktor Trescher
    • Axel VogelGuido SteffanKarl MannesViktor Trescher
    • C07C55/36C07C51/00C07C51/60C07C67/00C07C57/00
    • C07C51/60
    • In a process for the preparation of oxalyl chloride from an oxalic acid compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent hydrogen or a lower alkyl radical,and phosphorus pentachloride in the presence of phosphorus oxychloride, the improvement wherein the reaction is carried out in the presence of an amino compound of the formula ##STR2## wherein R.sup.3 represents alkyl, aralkyl, aryl or an acyl group, optionally substituted by amino or carboxamido andR.sup.4 and R.sup.5 are identical or different and represent hydrogen or alkyl, aralkyl, or aryl, optionally substituted by amino or carboxamido, orR.sup.4 and R.sup.5 are linked in an optionally substituted carbocyclic ring with 5 to 7 ring members, which optionally contains nitrogen, sulphur and/or oxygen and is optionally substituted by alkyl, aralkyl, aryl and/or amino groups, andR.sup.3 represents hydrogen or alkyl, which can be linked with R.sup.4 to form a carbocyclic ring, aralkyl or aryl, optionally substituted by an amino or carboxamido group, or optionally forms a double bond in one of the radials R.sup.4 or R.sup.5,and the oxalyl chloride formed is distilled off during the reaction.
    • 在通式“IMAGE”的草酸化合物(其中R 1和R 2相同或不同并且代表氢或低级烷基)和五氯化磷在磷酰氯存在下制备草酰氯的方法中, 该反应在下式的氨基化合物存在下进行:其中R 3表示烷基,芳烷基,芳基或酰基,任选被氨基或甲酰氨基取代,R 4和R 5相同或不同,表示氢或烷基 ,芳烷基或芳基,其任选被氨基或羧酰氨基取代,或R 4和R 5在任选取代的碳环中与5至7个环成员连接,所述环成员任选地含有氮,硫和/或氧并且任选地被烷基,芳烷基 ,芳基和/或氨基,并且R 3表示氢或烷基,其可以与R 4连接形成碳环,芳烷基或芳基,任选被上位体取代 或者在一个径向R4或R5中任选形成双键,并且在反应期间蒸馏形成的草酰氯。