2-Alkyl-2,4-diacyloxy-but-3-enals
    4.
    发明授权
    2-Alkyl-2,4-diacyloxy-but-3-enals 失效
    2-烷基-2,4-二酰氧基 - 丁-3-烯醛

    公开(公告)号:US4506096A

    公开(公告)日:1985-03-19

    申请号:US473773

    申请日:1983-03-10

    CPC分类号: C07C69/007 C07C67/29

    摘要: 2-Alkyl-2,4-diacyloxy-but-3-enals of the formula ##STR1## where R.sup.1 is alkyl and R.sup.2 is hydrogen, alkyl, a cycloaliphatic radical or an aromatic radical, are prepared by reacting a buta-1,3-diene of the formula ##STR2## with an oxygen donor. The new compounds are valuable intermediates in the preparation of terpenes, e.g. retinal, .beta.-carotin and apocarotinoids.

    摘要翻译: 其中R 1是烷基且R 2是氢,烷基,脂环族基团或芳族基团,其中R1是2-烷基-2,4-二酰氧基 - 丁-3-烯,其中R1是烷基,R2是氢,烷基, 具有式(III)的3-二烯与氧供体。 新化合物是制备萜烯的有价值的中间体,例如 视网膜,β-胡萝卜素和去角质素。

    Preparation of 2-alkyl-4,4-diacyloxybut-2-enals
    6.
    发明授权
    Preparation of 2-alkyl-4,4-diacyloxybut-2-enals 失效
    2-烷基-4,4-二酰氧基丁-2-烯的制备

    公开(公告)号:US4650896A

    公开(公告)日:1987-03-17

    申请号:US730686

    申请日:1985-05-03

    CPC分类号: C07C67/00

    摘要: 2-Alkyl-4,4-diacyloxybut-2-enals of the formula ##STR1## where R.sup.1 is alkyl and R.sup.2 is hydrogen or an aliphatic, cycloaliphatic or aromatic radical, are prepared by a process in which a 2-alkyl-1,4-diacyloxy-1,3-butadiene of the formula ##STR2## is reacted with oxygen or an oxygen donor in the presence of an acidic ion exchanger.

    摘要翻译: 其中R 1是烷基且R 2是氢或脂族,脂环族或芳族基团的通式Ⅰ的2-烷基-4,4-二酰氧基丁-2-烯通过其中2-烷基-1 在酸性离子交换剂存在下,使式II的4-二酰氧基-1,3-丁二烯与氧或氧供体反应。

    Preparation of cyclic acetals of 3-formyl-2-butenyltriphenylphosphonium
chloride
    9.
    发明授权
    Preparation of cyclic acetals of 3-formyl-2-butenyltriphenylphosphonium chloride 失效
    制备3-甲酰基-2-丁烯基三苯基氯化鏻的环状缩醛

    公开(公告)号:US5344995A

    公开(公告)日:1994-09-06

    申请号:US85903

    申请日:1993-07-06

    CPC分类号: C07F9/6552 C07D319/06

    摘要: An improved process for preparing cyclic acetals of 3-formyl-2-butenyltriphenylphosphonium chloride by acetalization of 3-formyl-2-butenyl acetate with an aliphatic 1,3-diol, conversion of the resulting 4-acetoxy acetal into the corresponding 4-hydroxy acetal, Vilsmeier chlorination to give the corresponding 4-chloro acetal and subsequent reaction with triphenylphosphine entails carrying out the first 3 steps in an aliphatic or cycloaliphatic hydrocarbon or mixture of hydrocarbons with 6-8 carbons and the reaction with triphenylphosphine in an alkanol with 1-3 carbons and/or in aliphatic or cycloaliphatic hydrocarbon with 6-8 carbons or a corresponding mixture of hydrocarbons. The process is particularly advantageous when conversion of the 4-acetoxy acetal into the 4-hydroxy acetal is carried out with an aqueous alkali metal hydroxide solution in the presence of phase-transfer catalysts, and the first three, or all four, reaction stages are carried out in the same C.sub.6 -C.sub.8 -hydrocarbon.

    摘要翻译: 通过用脂肪族1,3-二醇缩醛化3-甲酰基-2-丁烯基乙酸酯与3-甲酰基-2-丁烯基三苯基氯化鏻的环状缩醛的改进方法,将得到的4-乙酰氧基缩醛转化为相应的4-羟基 缩醛,Vilsmeier氯化,得到相应的4-氯缩醛,随后与三苯基膦反应需要在脂族或脂环族烃或碳原子数为6〜8的混合物中进行前3个步骤,并与三苯基膦在链烷醇中与1- 3个碳原子和/或具有6-8个碳原子的脂族或脂环族烃或相应的烃混合物。 当在相转移催化剂存在下,用碱金属氢氧化物水溶液进行4-乙酰氧基缩醛转化为4-羟基缩醛时,该方法是特别有利的,而前三个或所有四个反应阶段是 在相同的C6-C8-烃中进行。

    Preparation of .beta.-hydroxycarboxylates
    10.
    发明授权
    Preparation of .beta.-hydroxycarboxylates 失效
    β-羟基羧酸盐的制备

    公开(公告)号:US5294731A

    公开(公告)日:1994-03-15

    申请号:US36023

    申请日:1993-03-23

    CPC分类号: C07C67/343

    摘要: A process for the preparation of .beta.-hydroxycarboxylates of the general formula I ##STR1## in which R.sup.1 and R.sup.2 individually denoteC.sub.1 -C.sub.20 alkyl optionally substituted by C.sub.1 -C.sub.8 alkoxy and/or halogen, C.sub.3 -C.sub.20 alkoxycarbonylalkyl, C.sub.2 -C.sub.20 alkenyl, C.sub.5 -C.sub.30 acetalalkenyl, aryl optionally mono- to penta-substituted by C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, and/or halogen, C.sub.7 -C.sub.20 aralkyl, C.sub.7 -C.sub.20 aralkenyl, hetaryl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl,or together denote a C.sub.2 -C.sub.8 alkylene chainand one or other of R.sup.1 and R.sup.2 denotes hydrogen, andR.sup.3 denotes hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, aryl optionally mono- to penta-substituted by C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, and/or halogen, C.sub.7 -C.sub.20 aralkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl, andR.sup.4 denotes C.sub.1 -C.sub.20 alkyl, C.sub.4 -C.sub.20 alkenyl, C.sub.7 -C.sub.20 aralkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl,by the reaction of carbonyl compounds of the general formula II ##STR2## in which R.sup.1 and R.sup.2 have the meanings stated above, with .alpha.-bromocarboxylates of the general formula III ##STR3## in which R.sup.3 and R.sup.4 have the meanings stated above, wherein the reaction with zinc is carried out in methylene chloride at a temperature ranging from 0.degree. to 50.degree. C.

    摘要翻译: 制备通式I(I)的β-羟基羧酸盐的方法,其中R 1和R 2各自表示任选被C 1 -C 8烷氧基和/或卤素取代的C 1 -C 20烷基,C 3 -C 20烷氧基羰基烷基, C20烯基,C5-C30乙缩醛基,C1-C8烷基,C1-C8烷氧基和/或卤素任选被一至五取代的芳基,C 7 -C 20芳烷基,C 7 -C 20芳烯基,杂芳基,C 3 -C 20环烷基或 C 4 -C 20环烷基烷基,或一起表示C 2 -C 8亚烷基链,R 1和R 2中的一个或其中R 1表示氢,R 3表示氢,C 1 -C 20烷基,C 2 -C 20链烯基,任选地被C1任意单 - 五取代的芳基 C 8烷基,C 1 -C 8烷氧基和/或卤素,C 7 -C 20芳烷基,C 3 -C 20环烷基或C 4 -C 20环烷基烷基,R 4表示C 1 -C 20烷基,C 4 -C 20烯基,C 7 -C 20芳烷基, C20环烷基或C4-C20环烷基烷基,通过其中R1和R2具有上述含义的通式II(II)的羰基化合物与α-溴代羰基 通式III的化合物(III)其中R3和R4具有上述含义,其中与二氯甲烷的反应在0℃至50℃的温度下进行。