15111-56-5Relevant articles and documents
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Toki
, p. 233 (1959)
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METHOD FOR PURIFYING 4-HALO CYCLOHEXANE-1-CARBOXYLIC ACID, AND METHODS FOR PRODUCING PRODUCTS CONTAINING 4- HALO CYCLOHEXANE-1-CARBOXYLIC ACID
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Paragraph 0037-0038, (2020/03/31)
To provide a method for purifying a 4-halo cyclohexane-1-carboxylic acid which can be highly purified without performing column purification, and a method for producing a product containing the 4-halo cyclohexane-1-carboxylic acid.SOLUTION: There is provided a method for purifying a 4-halo cyclohexane-1-carboxylic acid comprising a crystallization step of subjecting a mixture including a 4-halo cyclohexane-1-carboxylic acid and a 3-halo cyclohexane-1-carboxylic acid to a crystallization operation in a mixed solvent of water and a water-soluble organic solvent or a hydrocarbon solvent to increase a content of the 4-halo cyclohexane-1-carboxylic acid.SELECTED DRAWING: None
Erbium triflate in ionic liquids: A recyclable system of improving selectivity in Diels-Alder reactions
Bortolini, Olga,De Nino, Antonio,Garofalo, Angelo,Maiuolo, Loredana,Procopio, Antonio,Russo, Beatrice
experimental part, p. 124 - 129 (2011/02/16)
The efficiency of Er(OTf)3 in promoting the Diels-Alder reactions between different dienes and dienophiles in ionic liquids has been investigated. Compared with the analogous cycloadditions performed in conventional solvents shorter reaction times are required to obtain good/excellent yields. In most cases an enhancement of regio- and endo:exo selectivity was observed. The role of the ionic liquid, as a function of the cationic part, i.e. the imidazolium based or the pyridinium based, is discussed well. The ILs containing the catalyst can be readily separated from the reaction products and recovered in very high purity for direct reuse, up to six cycles.
A practical new chiral controller for asymmetric Diels-Alder and alkylation reactions
Sarakinos, Georgios,Corey
, p. 1741 - 1744 (2008/02/11)
(formula presented) The enantiomerically pure hydroxy sulfones (+)- and (-)-2 have been prepared from 1,2-epoxycyclohexane by a simple and practical procedure. The acrylate esters of these alcohols undergo BCl3-catalyzed Diels-Alder reactions with a variety of dienes at -78 to -55°C in CH2Cl2 or C7H8 with high dienophile face selectivity (Table 1). The chiral esters so formed are readily cleaved with recovery of the controllers (+)- or (-)-2. Esters of (+)- and (-)-2 can be converted to Z-polassium enolates and alkylated with high face selectivity.