| [PMID]: | 25238594 |
| [Au] Autor: | Zhao J; Wang D; Autenrieth B; Buchmeiser MR |
| [Ad] Endereço: | Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart. |
| [Ti] Título: | First acyclic diene metathesis polymerization under biphasic conditions using a dicationic ruthenium alkylidene: access to high-molecular-weight polymers with very low ruthenium contamination. |
| [So] Source: | Macromol Rapid Commun;36(2):190-4, 2015 Jan. |
| [Is] ISSN: | 1521-3927 |
| [Cp] País de publicação: | Germany |
| [La] Idioma: | eng |
| [Ab] Resumo: | The acyclic diene metathesis (ADMET) polymerization of 6-hydroxy-1,10-undecadiene (M1) and 6-acetoxy-1,10-undecadiene (M2) by the action of two different catalysts, i.e., the second-generation Grubbs-Hoveyda system ([RuCl2(IMesH2)(CH-2-(2-PrO-C6H4)]) (1) and the dicationic ruthenium alkylidene [Ru(DMF)3(IMesH2)(CH-2-(2-PrO-C6H4)] (2, IMesH2 = 1,3-dimesitylimidazolin-2-ylidene) is reported. Biphasic conditions using 1-butyl-2,3-dimethylimidazolium tetrafluoroborate ([BDMIM(+)BF4(-)]) and 1,2,4-trichlorobenzene (TCB) are applied. Under the chosen conditions (T = 75 °C, 20 mbar), the use of catalyst 1 results only in the formation of low-molecular-weight polymers (Mn ≤ 10,000 g mol(-1)), while catalyst 2 allows for the high yield synthesis of high-molecular-weight polymers (Mn ≤ 40,000 g mol(-1), yields ≤ 99%). Irrespective of the catalyst used, all polymers display a high trans-content (>95%). Notably, Ru-contamination of the target polymers without any additional purification is as low as 1.2 ppm with catalyst 2. Together with the high yields and high molecular weights, the low Ru-contaminations clearly illustrate the advantages of the biphasic setup. |
| [Mh] Termos MeSH primário: |
Hidrocarbonetos Acíclicos/química
Polienos/química
Polimerização
Polímeros/química
Rutênio/química
|
| [Mh] Termos MeSH secundário: |
Boratos
Ácidos Bóricos/química
Catálise
Cátions/química
Clorobenzenos/química
Imidazóis/química
Espectroscopia de Ressonância Magnética
Modelos Químicos
Estrutura Molecular
Peso Molecular
Polímeros/síntese química
Espectrofotometria Infravermelho
|
| [Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (1-butyl-2,3-dimethylimidazolium); 0 (Borates); 0 (Boric Acids); 0 (Cations); 0 (Chlorobenzenes); 0 (Hydrocarbons, Acyclic); 0 (Imidazoles); 0 (Polyenes); 0 (Polymers); 05IQ959M1N (1,2,4-trichlorobenzene); 7UI0TKC3U5 (Ruthenium); H429WZ9FBQ (fluoroboric acid) |
| [Em] Mês de entrada: | 1509 |
| [Cu] Atualização por classe: | 171116 |
[Lr] Data última revisão:
| 171116 |
| [Sb] Subgrupo de revista: | IM |
| [Da] Data de entrada para processamento: | 140920 |
| [St] Status: | MEDLINE |
| [do] DOI: | 10.1002/marc.201400413 |
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