| Journal: | Brazilian journal of chemical engineering |
| Database: | PERIÓDICA |
| System number: | 000308785 |
| ISSN: | 0104-6632 |
| Authors: | Aranda, D.A.G1 Carneiro, J.W.M2 Oliveira, C.S.B Passos, F.B3 Souza, P.R.N Antunes, O.A.C4 |
| Institutions: | 1Universidade Federal do Rio de Janeiro, Escola de Quimica, Rio de Janeiro. Brasil 2Universidade Federal Fluminense, Instituto de Quimica, Niteroi, Rio de Janeiro. Brasil 3Universidade Federal Fluminense, Escola de Engenharia, Niteroi, Rio de Janeiro. Brasil 4Universidade Federal do Rio de Janeiro, Instituto de Quimica, Rio de Janeiro. Brasil |
| Year: | 2001 |
| Season: | Sep |
| Volumen: | 18 |
| Number: | N |
| Pages: | 287-298 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Hydrogenation of methyl pyruvate on a palladium or platinum surface in the presence of cinchona alkaloids leads to a high degree of enantiodifferentiation. In the present study, the semiempirical AM1 and PM3 methods are employed to perform a detailed analysis of the conformational behavior of cinchonidine and to study its interaction with methyl pyruvate. Nine different minima were located on the potential energy surface for cinchonidine by both the AM1 and the PM3 methods. Some barriers to interconversion between them are relatively high; however, it is always possible to connect two minima through barriers lower than 3.0 kcal/mol so most of the minima can interact with the substrate. The interaction between cinchonidine and methyl pyruvate was calculated by placing methyl pyruvate near the cinchonidine molecule in different orientations and optimizing the final complex. The calculated interaction energy is lower than 3.5 kcal/moland is predominantly due to van der Waals noncovalent interactions. An analysis of the structure of possible pro-R and pro-S complexes indicates that interaction between cinchonidine and methyl pyruvate alone is not enough to induce enantiodifferentiation |
| Disciplines: | Química |
| Keyword: | Química organometálica, Ingeniería química, Metil piruvato, Hidrogenación, Catálisis, Alcaloides, Enantioselectividad, Modelado molecular |
| Keyword: | Chemistry, Organometallic chemistry, Chemical engineering, Methyl pyruvate, Hydrogenation, Catalysis, Alkaloids, Enantioselectivity, Molecular modelling |
| Full text: | Texto completo (Ver HTML) |
