- Reusable rhodium catalyst for the selective transvinylation of sp2-C linked carboxylic acid
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The vinyl benzoate derivatives were successfully synthesized by the transvinylation reactions that vinyl group transferred from vinyl acetate to aromatic carboxylic acids with the recoverable catalyst RhCl3·3H2O. This catalyst features air stable and tolerance of water, good reusable ability, meanwhile, shows high selectivity for aromatic carboxylic acid in the presence of phenolic hydroxyl. With this method, a variety of vinyl benzoate derivatives can be produced with up to 95% yield.
- Jiang, Ruihang,Chen, Zhangpei,Zhan, Kun,Liu, Lei,Zhou, Junjie,Ai, Yongjian,Li, Shuang,Bao, Hongjie,Hu, Ze'nan,Qi, Li,Wang, Jingting,Sun, Hong-bin
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p. 3279 - 3282
(2018/07/21)
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- Process for Preparing Vinyl Carboxylates
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The present invention relates to a process for preparing vinyl carboxylates, wherein a carboxylic acid is reacted with an alkyne compound in the presence of a catalyst which is selected from carbonyl complexes, halides and oxides of rhenium, of manganese, of tungsten, of molybdenum, of chromium and of iron and rhenium metal at a temperature of ≦300° C. The process gives the desired vinyl esters with high yield.
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Page/Page column 6
(2009/01/24)
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- METHOD FOR PRODUCING CYCLIC UNSATURATED COMPOUND
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The present invention provides a method for producing a cyclic unsaturated compound, which sufficiently suppresses generation of acyclic unsaturated compounds and permits excellent yield and reaction rate. Such a method for producing a cyclic unsaturated compound is a method for producing a cyclic unsaturated compound by reacting an a, ?-unsaturated carboxylic acid with an unsaturated organic compound, wherein the method comprises a step of reacting the a, ?-unsaturated carboxylic acid with the unsaturated organic compound in the presence of a catalyst.
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Page/Page column 75-76, 84-85; 91; 93
(2008/06/13)
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- Transvinylation process for the preparation of thermally labile vinyl compounds and for vinyl compounds prepared from thermally labile acids
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A process for the transvinylation of a vinyl derivative of a Bronsted acid with a different Bronsted acid which comprises providing a liquid phase mixture containing said vinyl derivative and said Bronsted acid in the presence of a ruthenium compound at a temperature at which transvinylation occurs and recovering as a product of transvinylation the vinyl derivative of the different Bronsted acid. The process is most favorably employed using carboxylic acids to make vinyl esters of carboxylic acids.
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- Method for the preparation of alkenyl esters of carboxylic acids
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A novel and effective catalyst system is provided for application in the preparation of alkenyl esters of carboxylic acids by transesterification reaction. The catalyst system consists of a palladium compound as the main ingredient and a cocatalyst formed of an alkali metal compound and a copper compound, at least one of which is a halide. The catalyst ingredients are adsorbed on a solid catalyst carrier, so that repeated use of the combined catalyst or a continuous operation of the reaction can easily be facilitated.
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- HYDROCHLORINATION OF VINYL AND ALLYL ACRYLATES AND TRANS-CROTONATES
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Different orders of addition were established for the addition of hydrogen chloride to vinyl and allyl acrylates and trans-crotonates.The hydrochlorination of vinyl and allyl acrylates takes place regioselectively at the double bond of the acrylic system.The hydrochlorination of vinyl and allyl trans-crotonates takes place at the double bond of the alkenoxy group.Vinyl β-chloropropionate and β-chlorobutyrate were also obtained by transvinylation of the acids with vinyl acetate.The ability of the obtained chloroesters to undergo certain chemical transformations was demonstrated.
- Komarova, L. I.,Zhuravleva, E. I.
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p. 455 - 457
(2007/10/02)
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