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16 results on '"Gonsales, Stella A."'

2. Cyclic polyacetylene

Author

Miao, Zhihui, Gonsales, Stella A., Ehm, Christian, Mentink-Vigier, Frederic, Bowers, Clifford R., Sumerlin, Brent S., and Veige, Adam S.

Published
2021
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9. Synthesis, structural and magnetic characterization of a copper(II) complex of 2,6-di(1H-imidazol-2-yl) pyridine and its application in copper-mediated polymerization catalysis

Author

Arruda, Eduardo Guimarães Ratier de, 1990, Jannuzzi, Sergio Augusto Venturinelli, 1987, Gonsales, Stella de Almeida, 1987, Timm, Ronaldo Adriano, Sharma, Surender Kumar, 1976, Kubota, Lauro Tatsuo, 1964, Knobel, Marcelo, 1968, Formiga, André Luiz Barboza, 1978, and UNIVERSIDADE ESTADUAL DE CAMPINAS

Subjects
Catálise, Materiais ferromagnéticos, Square-pyramidal copper(II), Copper compounds, Imidazol-2-yl ligand, Artigo original, Ferromagnetic materials, Cu(I)-mediated ATRP, Catalysis, Compostos de cobre, Ferromagnetic coupling
Abstract

Agradecimentos: This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) [Grant Nos. 402627/2012-1, 202911/2014-4 and 131848/2013-5]; the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) [Grant Nos. 2012/12773-1 and 2013/22127-2]; the Instituto Nacional de C,T & I em Materiais Complexos Funcionais (INOMAT); the Nanomaterials and Nanotechnologies for Environment Protection and Sustainable Future (NanoEnviCz) [Grant No. LM2015073]; the Centro Nacional de Processamento de Alto Desempenho em São Paulo (CENAPAD-SP) Abstract: The 2,6-di(1H-imidazol-2-yl) pyridine (H(2)dimpy) ligand is synthesized and suggested as an alternative ligand for copper mediated catalysis. A Cu(II) complex was obtained with this ligand and characterized via ESI-MS, FT-IR, UV-vis and the structure was confirmed by single crystal XRD. The crystal showed the [Cu-2(H(2)dimpy)(2)(mu-Cl)(2)] (PF6)(2)] center dot 2H(2)O dimeric complex, in which Cu(II) is in a distorted square-pyramidal geometry (tau = 0.301). Ferromagnetic coupling with J = -11.1 cm(-1) was confirmed by experiment and corroborated by density functional calculations. In order to evaluate the applicability of H(2)dimpy in atom transfer radical polymerization (ATRP), polystyrene was produced in DMF solution at low polydispersity (1.3) while maintaining the livingness of the polymer chain. The good performance of the H(2)dimpy compared to a standard ligand for ATRP (5,5'-dimethyl-2,2'-dipyridyl) indicates that it is suitable for this reaction CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Fechado

Published
2017

10. Synthesis, structural and magnetic characterization of a copper(II) complex of 2,6-di(1H-imidazol-2-yl)pyridine and its application in copper-mediated polymerization catalysis

Author

Ratier de Arruda, Eduardo Guimarães, primary, de Farias, Marcelo Alexandre, additional, Venturinelli Jannuzzi, Sergio Augusto, additional, de Almeida Gonsales, Stella, additional, Timm, Ronaldo Adriano, additional, Sharma, Surender, additional, Zoppellaro, Giorgio, additional, Kubota, Lauro Tatsuo, additional, Knobel, Marcelo, additional, and Barboza Formiga, André Luiz, additional

Published
2017
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16. Catalytic and Stereoselective Transformations with Easily Accessible and Purchasable Allyl and Alkenyl Fluorides.

Author

Paioti PHS, Gonsales SA, Xu S, Nikbakht A, Fager DC, Liu Q, and Hoveyda AH

Subjects
Stereoisomerism, Catalysis, Ketones chemistry, Fluorides chemistry, Fluorine
Abstract

Stereochemically defined organofluorine compounds are vital to drug discovery and many applicable catalytic strategies have been introduced for accessing these entities stereoselectively. One approach entails incorporation of a fluorine atom (C-F bond formation) or an organofluorine moiety (e.g., CF 3 or CF 2 H), and another exploits commercially available compounds with one or more fluorine atoms. Here, we present the state-of-the-art regarding the use of alkenyl and allylic fluorides in preparation of stereochemically defined fluoro-organic molecules. Allylic and alkenyl fluorides may be purchased or generated from a commercially available acid, carboxylate salt, ester, aldehyde hydrate, or ketone bearing several fluorine atoms next to a carbonyl group. We underscore the untapped potential of purchasable organofluorine compounds, many allylic and alkenyl fluorides, as launching points for development of stereoselective processes that are of value to therapeutic science., (© 2022 Wiley-VCH GmbH.)

Published
2022
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