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    • 6. 发明授权
    • Preparation of alpha-substituted upsilon-butyrolactones
    • 制备α-取代的上升 - 丁内酯
    • US4831166A
    • 1989-05-16
    • US47131
    • 1987-05-08
    • Heinz EckhardtWalter GramlichWalter BestKlaus Halbritter
    • Heinz EckhardtWalter GramlichWalter BestKlaus Halbritter
    • B01J27/10B01J27/18B01J27/232B01J31/02C07B61/00C07D307/33C07D315/00
    • C07D307/33C07D315/00
    • .gamma.-butyrolactones of the general formula I ##STR1## where R.sup.1 is hydrogen or alkyl of 1 to 4 carbon atoms which may be substituted by lower alkoxy or acyloxy and R.sup.2 is hydrogen or straight-chain or branched alkyl which is unsubstituted or substituted by a functional group or is aryl, are prepared by reacting an alkylene oxide of the general formula II ##STR2## with an acylacetate of the general formla III ##STR3## where R.sup.1 and R.sup.2 have the above meanings and R.sup.3 and R.sup.4 are each alkyl of 1 to 6 carbon atoms or aryl, and R.sup.4 may furthermore be hydrogen, in the presence of a catalyst at elevated temperatures, by a process in which the reaction is carried out in the presence of an alkali metal halide, of an ammonium halide, preferably a quaternary ammonium halide, of a phosphonium halide, of an alkali metal phosphate or of an alkali metal carbonate at from 20.degree. to 200.degree. C. and under from 1 to 50 bar.
    • 通式I(I)的γ-丁内酯,其中R 1是氢或可以被低级烷氧基或酰氧基取代的具有1至4个碳原子的烷基,R 2是氢或未被取代的直链或支链烷基, 被官能团取代或是芳基,通过使通式II(II)的烯化氧与一般形式III(III)的酰基乙酸酯反应制备,其中R 1和R 2具有上述含义, R 3和R 4各自为1至6个碳原子的烷基或芳基,并且R 4还可以在催化剂存在下在升高的温度下通过其中反应在碱金属卤化物 卤化铵,碱金属磷酸盐或碱金属碳酸盐的卤化铵,优选季铵卤化物,在20至200℃和1至50巴之间。