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|Type:||Artigo de periódico|
|Title:||An in situ NMR study of the reactions of cyclohexanone promoted by solid acid catalysts: acetalization versus deuteration|
|Abstract:||The effect of different catalysts (NaY, Cr-VPI-5, acidic kaolinite clay, clayfen, and p-toluenesulfonic acid) on the reaction between cyclohexanone and methanol-d(4) was investigated using GC-MS and in situ NMR spectroscopy at room temperature. An in situ IR spectroscopy analysis of pyridine adsorbed on the clay and NaY samples showed that they are both weakly acidic. Depending on the catalyst employed, acetalization, alpha-carbon deuteration, or both of these reactions occurred. With the clays only acetalization proceeded to yield 1, 1-dimethoxycyclohexane with 90% conversion at room temperature. When zeolite Y was used, only deuteration of the cyclohexanone alpha-carbon was observed, while with the homogeneous p-toluenesulfonic acid catalyst, both deuteration of the alpha-carbons and the acetalization reaction proceeded. (C) 2003 Elsevier Science B.V. All rights reserved.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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