- Polyacrylonitrile fiber mat supported solid acid catalyst for acetalization
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A novel polyacrylonitrile hybrid fiber mat supported solid acid catalyst was prepared by electrospin-ning, and its catalytic activities were carefully investigated through acetalization reactions. The results showed that this hybrid fiber mat exhibits high activity for the reactions, with average yields over 95%. Besides having catalytic activities similar to the solid acid, the heterogeneous solid acid/polyacrylonitrile mat can be reused in six runs without significant loss of catalytic activities. The large size of the hybrid fiber mat greatly facilitates recovery of the catalyst from the reaction mixture. The high and stable catalytic activities of the hybrid fiber mat hold great potential for green chemical processes and preparation of membrane reactors in the future.
- Shao, Linjun,Du, Yijun,Xing, Guiying,Lv, Weixi,Liang, Xuezheng,Qi, Chenze
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experimental part
p. 1199 - 1203
(2012/10/07)
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- Acid catalysed reaction of estrones with neopentyl glycol under forced conditions
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Upon reaction with an excess of 2,2-dimethylpropane-1,3-diol (neopentyl glycol) under acid catalysis, estrones form 17-O-[2',2'-dimethyl-2'-(5", 5"-dimethyl-1",3"-dioxanyl)ethyl] substituted estra-3,17β-diols. The reaction represents a formal reduction of a keto function under acidic conditions in the absence of a metal.
- Oliveira, Cristina,Morais, Goreti Ribeiro,Imai, Masao,Inohae, Eiko,Yamamoto, Chishou,Mataka, Shuntaro,Thiemann, Thies
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body text
p. 158 - 162
(2010/08/06)
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- 3,3,9,9-Tetramethyl-1,5,7,11-tetraoxaspiro[5.5]undecane as a reagent for protection of carbonyl compounds
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3,3,9,9-Tetramethyl-1,5,7,11-tetraoxaspiro[5.5]undecane is introduced as a new, stable and chemoselective reagent for the protection of aldehydes and ketones under mild reaction condition in high yield.
- Rahimizadeh, Mohammad,Bakavoli, Mehdi,Shiri, Ali,Eshghi, Hossein,Saberi, Sattar
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experimental part
p. 704 - 706
(2009/09/25)
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- An efficient procedure for protection of carbonyls in Br?nsted acidic ionic liquid [Hmim]BF4
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Protection of carbonyls as acetals or ketals using Br?nsted acidic ionic liquid [Hmim]BF4 as catalyst as well as solvent was investigated. Satisfactory results were obtained for the protection of carbonyls as cycloacetals or ketals with diols. The product can be separated conveniently from the reaction system, and the ionic liquid can be reused after removal of water.
- Wu, Hai-Hong,Yang, Fan,Cui, Peng,Tang, Jie,He, Ming-Yuan
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p. 4963 - 4965
(2007/10/03)
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- Solid supported reactions and reagents XIV [1]: Envirocat EPZG as a novel catalyst for selective acetalization of aldehydes and ketones
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Envirocat EPZG is an efficient reusable catalyst for acetalization of aldehydes and ketones. The isolation of pure products in high yields by simple filtration and evaporation of the solvent is an important feature of this method.
- Bandgar, Babasaheb P.,Gaikwad, Nandkumar B.
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p. 719 - 722
(2007/10/03)
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- Efficient Synthesis of Acetals Promoted by a Yttria-Zirconia Based Strong Lewis Acid Catalyst
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A variety of carbonyl compounds react with 2,2-dimethylpropane-1,3-diol in the presence of a catalytic amount of a novel yttria-zirconia based strong Lewis acid to afford the corresponding acetals in excellent yields.
- Pals, Godwin C. G.,Keshavaraja,Saravanan,Kumar, Pradeep
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p. 426 - 427
(2007/10/03)
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