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You searched for subject:(Pyridinium compounds Synthesis). Showing records 1 – 2 of 2 total matches.

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Georgia Tech

1. Shotwell, Sandra Leigh. Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.

Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech

In the first part of this thesis, the synthesis, characterization and investigation of ortho-phenyleneethynylenes containing heterocycles, are presented. These compounds display changes in absorption and emission spectra varying with their functionalization and size. These compounds also have the ability to coordinate with metals. The synthesis of coordination compounds and their crystallographic data are reported. The synthesis and characterization of tetraethynyl thiophene compounds containing pyridines are also presented. These compounds exhibit differences in absorption and emission spectra upon exposure to various metal salts. The final topic to be discussed is the synthesis and characterization of diphenyl amine polymers. These polymers could in principle be used in NLO applications or light emitting devices. Advisors/Committee Members: Dr. Uwe Bunz (Committee Chair), Dr. Anselm Griffin (Committee Member), Dr. David Collard (Committee Member), Dr. Joseph Perry (Committee Member), Dr. Laren Tolbert (Committee Member).

Subjects/Keywords: Polymers; Thiophenes Synthesis; Pyridinium compounds Synthesis; Ligands; Diphenylamine Synthesis; Oligomers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shotwell, S. L. (2006). Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/10449

Chicago Manual of Style (16th Edition):

Shotwell, Sandra Leigh. “Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.” 2006. Doctoral Dissertation, Georgia Tech. Accessed March 08, 2021. http://hdl.handle.net/1853/10449.

MLA Handbook (7th Edition):

Shotwell, Sandra Leigh. “Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.” 2006. Web. 08 Mar 2021.

Vancouver:

Shotwell SL. Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1853/10449.

Council of Science Editors:

Shotwell SL. Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/10449

2. Lucchese, Angélica Maria. Síntese de sais de piridínio novos catalisadores de transferência de fase.

Degree: PhD, Química Orgânica, 1997, University of São Paulo

Neste trabalho foi preparada uma série de sais de piridínio, com subsequente investigação da sua atividade catalítica e indução assimétrica em reações de adição de Michael e alquilações de metilenas ativas. Os sais de piridínio foram preparados pela reação de tetrafluorborato de 2,4,6-trifenilpirílio e 2,4,6-trimetilpirílio com aminas, aminoálcoois e/ou aminoácidos. As reações em que se efetuou o teste catalítico destes sais foram: a) adição de cianoacetato de etila, N-acetamidomalonato de dietila e nitrometano à chalcona e de tiofenol à 2-ciclohexenona; b) alquilação de cianoacetato de etila e de fenilcianoacetato de etila com cloreto de benzila. Os sais de piridínio testados atuaram como catalisadores nas alquilações de metilenas ativas e nas adições de Michael, com exceção da reação de N-acetamidomalonato de dietila com chalcona. No que tange à eficiência como indutores de assimetria, foram feitas reações comparativas entre os sais de piridínio quirais, o brometo de N-benzil-N-metilefedrínio ou o cloreto de N-benzilquinínio, sendo que os catalisadores por nós sintetizados se mostraram menos eficientes. A conformação preferencial de três sais de piridínio, em que a cadeia alquílica ligada ao átomo de nitrogênio possue um substituinte aromático, foi determinada através de experimentos de NOE-diff. Para dois destes sais há evidências da formação de complexos de transferência de carga intramolecular. A atividade catalítica e a indução assimétrica destes três catalisadores foi interpretada com base no estudo conformacional acima mencionado.

In the presente work, a series of pyridinium salts was prepared and their catalytic activity evaluated, as well as their ability to induce asymmetry in Michael additions and alkylation of organic carbon acids. Such pyridinium salts were prepared by reacting 2,4,6-triphenyl or 2,4,6-trimethylpyrilium tetrafluoroborates with amines, α-aminoalcohols or α-aminoacids. The catalytic activity of the prepared salts was evaluated in the folIowing PTC reactions: a) Michael addition of ethylcyanoacetate, diethyl N-acetamidomalonate or nitromethane to chalcone and of thiophenol to 2-cyclohexenone; b) alkylation of ethylcyanoacetate or ethyl phenylcyanoacetate, using benzyl chloride as eletrophile. In alI cases, except 1,4-addition of diethyl N-acetamidomalonate to chalcone, the prepared pyridinium salts displayed catalytic activity although with inferior asymmetric induction efficiency as compared to the classicalIy used efedrinium and quininium salts. The preferencial conformation of three pyridinium salts bearing aromatic rings in the nitrogen substituent aliphatic chain was determined by NOE diff experiments. In two cases some evidences for charge transfer was provided by uv measurements. The catalytic result and the asymmetric induction were interpreted on the basis of the well accepted substrate/catalyst interaction model and conformational analysis data.

Advisors/Committee Members: Marzorati, Liliana.

Subjects/Keywords: Asymmetric synthesis; Catálise; Catalysis; Compostos de nitrogênio; Nitrogen compounds; Organic chemistry; Organic synthesis (Chemistry); Pyridinium salts; Química orgânica; Sais de piridínio; Síntese assimétrica; Síntese orgânica (química)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lucchese, A. M. (1997). Síntese de sais de piridínio novos catalisadores de transferência de fase. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/46/46135/tde-05092014-165559/ ;

Chicago Manual of Style (16th Edition):

Lucchese, Angélica Maria. “Síntese de sais de piridínio novos catalisadores de transferência de fase.” 1997. Doctoral Dissertation, University of São Paulo. Accessed March 08, 2021. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-05092014-165559/ ;.

MLA Handbook (7th Edition):

Lucchese, Angélica Maria. “Síntese de sais de piridínio novos catalisadores de transferência de fase.” 1997. Web. 08 Mar 2021.

Vancouver:

Lucchese AM. Síntese de sais de piridínio novos catalisadores de transferência de fase. [Internet] [Doctoral dissertation]. University of São Paulo; 1997. [cited 2021 Mar 08]. Available from: http://www.teses.usp.br/teses/disponiveis/46/46135/tde-05092014-165559/ ;.

Council of Science Editors:

Lucchese AM. Síntese de sais de piridínio novos catalisadores de transferência de fase. [Doctoral Dissertation]. University of São Paulo; 1997. Available from: http://www.teses.usp.br/teses/disponiveis/46/46135/tde-05092014-165559/ ;

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