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The term "nonlinear effect" is somewhat unfortunate, as other correlations such as the product selectivity as a function of the optical purity of a catalyst are also nonlinear. An example is the dependence of the logarithmic product ratio of selective reactions as a function of the reciprocal temperature (isoinversion principle): a) H. Buschmann, H.-D. Scharf, N. Hoffmann, P. Esser, Angew. Chem. 1991, 103, 480- 515: Angew. Chem. Int. Ed. Engl. 1991, 30, 477-515. b) D. Heller, H. Buschmann, Top. Catal. 1998, 5, 159-176. This nonlinear temperature dependence - the first work was carried out by Pracejus (H. Pracejus. Justus Liebigs Ann. Chem. 1960, 634, 9-22) - should be typical for all reactions displaying nonlinear effects in the "Kaganian" sense. The product enantiomers result from various reaction pathways.
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The term "nonlinear effect" is somewhat unfortunate, as other correlations such as the product selectivity as a function of the optical purity of a catalyst are also nonlinear. An example is the dependence of the logarithmic product ratio of selective reactions as a function of the reciprocal temperature (isoinversion principle): a) H. Buschmann, H.-D. Scharf, N. Hoffmann, P. Esser, Angew. Chem. 1991, 103, 480- 515: Angew. Chem. Int. Ed. Engl. 1991, 30, 477-515. b) D. Heller, H. Buschmann, Top. Catal. 1998, 5, 159-176. This nonlinear temperature dependence - the first work was carried out by Pracejus (H. Pracejus. Justus Liebigs Ann. Chem. 1960, 634, 9-22) - should be typical for all reactions displaying nonlinear effects in the "Kaganian" sense. The product enantiomers result from various reaction pathways.
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13
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0032372177
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This nonlinear temperature dependence - the first work was carried out by Pracejus
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The term "nonlinear effect" is somewhat unfortunate, as other correlations such as the product selectivity as a function of the optical purity of a catalyst are also nonlinear. An example is the dependence of the logarithmic product ratio of selective reactions as a function of the reciprocal temperature (isoinversion principle): a) H. Buschmann, H.-D. Scharf, N. Hoffmann, P. Esser, Angew. Chem. 1991, 103, 480- 515: Angew. Chem. Int. Ed. Engl. 1991, 30, 477-515. b) D. Heller, H. Buschmann, Top. Catal. 1998, 5, 159-176. This nonlinear temperature dependence - the first work was carried out by Pracejus (H. Pracejus. Justus Liebigs Ann. Chem. 1960, 634, 9-22) - should be typical for all reactions displaying nonlinear effects in the "Kaganian" sense. The product enantiomers result from various reaction pathways.
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should be typical for all reactions displaying nonlinear effects in the "Kaganian" sense. The product enantiomers result from various reaction pathways
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The term "nonlinear effect" is somewhat unfortunate, as other correlations such as the product selectivity as a function of the optical purity of a catalyst are also nonlinear. An example is the dependence of the logarithmic product ratio of selective reactions as a function of the reciprocal temperature (isoinversion principle): a) H. Buschmann, H.-D. Scharf, N. Hoffmann, P. Esser, Angew. Chem. 1991, 103, 480- 515: Angew. Chem. Int. Ed. Engl. 1991, 30, 477-515. b) D. Heller, H. Buschmann, Top. Catal. 1998, 5, 159-176. This nonlinear temperature dependence - the first work was carried out by Pracejus (H. Pracejus. Justus Liebigs Ann. Chem. 1960, 634, 9-22) - should be typical for all reactions displaying nonlinear effects in the "Kaganian" sense. The product enantiomers result from various reaction pathways.
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3 model, the heterochiral species is not a meso compound, and this has a corresponding effect on product formation
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3 model, the heterochiral species is not a meso compound, and this has a corresponding effect on product formation.
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A symposium of the German Chemical Society (GDCh) was held in Rostock/Warnemünde on June 21 and 22, 1999 on the occasion of Langenbeck's 100th birthday
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W. Langenbeck (1899-1967) together with G. Rienäcker founded the "Institut für Katalyseforschung der Akademie der Wissenschaften" in Rostock, Germany in 1951. This was the first institute for catalysis research in Europe. He is famous above all for his work on enzyme models as well as his text book of organic chemistry. For a detailed summary of Langenbeck's work, see A. Schellenberger, Chem. Ber. 1990, 123, I-XV. A symposium of the German Chemical Society (GDCh) was held in Rostock/Warnemünde on June 21 and 22, 1999 on the occasion of Langenbeck's 100th birthday.
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2 with 0.015% ethanol in hexane as the cluent. The separation of bis-D-menthyl oxalate from bis-L-menthyl oxalate and the meso form was successful on a stationary phase Chiralcel OD-H (Daicel) with hexane as the eluent. Area factors between the optically pure diesters and the meso compound were disregarded, as these did not change the qualitative results.
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26
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85035332030
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(Eds.: E. L. Eliel, S. H. Wilen), Wiley, New York
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Amplification effects for a reaction of second or higher order that did not proceed with full conversion to products and which are not reducible to diastereomeric units were not investigated further due to the complexity of the problem. For example, if a nonracemic enantiomeric mixture reacted exclusively to give a homodimer product (2A - AA or 2B - BB) and if the conversion is less than 100%, the enantiomeric excess of the product is always larger than that of the starting material. Many examples of this type of amplification are discussed by a variety of authors in "Origins of Chiral Homogeneity in Nature": W. A. Bonner in Topics in Stereochemistry, Vol. 18 (Eds.: E. L. Eliel, S. H. Wilen), Wiley, New York, 1988, pp. 1-96.
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