10 resultados para conformal transformations


Relevância:

10.00% 10.00%

Publicador:

Resumo:

Contributed to: Virtual Retrospect 2007 (Pessac, France, Nov 14-16, 2007)

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Traducido por Iñaki Villoslada Fernández

Relevância:

10.00% 10.00%

Publicador:

Resumo:

[ES]Este artículo pretende analizar la situación de la actividad siderometalúrgica guipuzcoana durante el siglo XVII y testar la verdadera repercusión de la crisis del siglo XVII en dicho sector. Para ello se ha utilizado un amplio elenco documental procedente tanto de archivos locales como regionales y nacionales, que responde a una amplia variedad tipológica.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Actas de la XII Reunión Científica de la Fundación Española de Historia Moderna, celebrada en la Universidad de León en 19-21 de junio de 2012.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Dedicated to Prof. Julio Alvarez-Builla on the occasion of his 65th anniversary.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

During the research that it is summarized in the present memory, the activation of enals via iminium ion catalysis in different transformations has been studied. Firstly, a 1,3-dipolar cycloaddition between stable azomethine ylides and a,b-unsaturated aldehydes catalyzed by a chiral imidazolidinone derivative has been optimized. Employing this methodology we have synthesized a large range of densely substituted pyrroloisoquinolines and pyrrolophthalazines with good yields and high values of diastereo- and enantioselectivity. Moreover, a mechanistic study has been carried out based on DFT calculations and experimental data which have allowed us to propose that the (3+2) cycloaddition reaction follows a sequential Michael addition/Mannich cyclization pathway. The formation of the iminium ion as a result of the condensation between the a,b-unsaturated aldehyde and the catalyst plays an essential role, regarding both reactivity and stereoselectivity. On the other hand we have developed a methodology to carry out a cascade Michael/Henry reaction followed by a sequential dehydration. Starting from simple substrates (2-nitromethylacrilates and a,b-unsaturated aldehydes) and employing a prolinol-derivative catalyst a series of quiral nitrocyclohexadienes have been synthesized.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

[EUS] Gorbeako Mendi Taldeko haran atlantiarretako baserria eta paisaia. Aldakuntza Gorbeako Mendi Taldeko haran atlantiarretan izandako paisai aldaketa berria aurkeztu nahi da, horretan XX. mendearen erdian nagusitzen zen baserri intentsibotik gaur egun askoz estentsiboagoa den beste batera pasatzeak zerikusi handia duelarik. Erabili diren informazio iturri printzipalak argazki aereoa eta inkesta izan dira.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

1000 p. (Anexos: 929-965 p.; bibliografía 965-1000 p.). Capítulos de discusión y conclusiones en castellano y francés.