{"id":76656,"date":"2018-03-09T23:22:03","date_gmt":"2018-03-09T23:22:03","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/diseno-de-catalizadores-polimericos-para-catalisis-soportada-enantioselectiva\/"},"modified":"2018-03-09T23:22:03","modified_gmt":"2018-03-09T23:22:03","slug":"diseno-de-catalizadores-polimericos-para-catalisis-soportada-enantioselectiva","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/diseno-de-catalizadores-polimericos-para-catalisis-soportada-enantioselectiva\/","title":{"rendered":"Dise\u00f1o de catalizadores polimericos para catalisis soportada enantioselectiva."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Alejandro Presa Soto <\/strong><\/h2>\n<p>Con el objetivo de evaluar la actividad enantioselectiva de centros catal\u00edticos situados en los \u00abbolsillos quirales\u00bb que contienen los polifosfacenos con unidades r-2,2\u00c2\u00bf-dioxi-1,1\u00c2\u00bf-binaftil,  se ha desarrollado la s\u00edntesis de complejos polim\u00e9ricos lineales o entrecruzados formados por la coordinaci\u00f3n de fragmentos de tipo [ru(ii)(p-cimeno)] (neutros o cati\u00f3nicos) sobre los grupos ligantes de polibinaftoxifosfacenos quirales de composici\u00f3n general {[np(o2c20h12)]1-x[n(o-r-l)2]x} (0.1  menor que  x  menor que  0.2, l = py, pph2) o {[np(o2c20h10-f2)]0.8[n(o-c6h4-pph2)2]0.2}, con f =br, sime3, siphme2, siph2me, siph4, snme3, y snph3, situados en las posiciones 6,6\u00c2\u00bf del binaftilo.  para ello, se han sintetizado de nuevos polifosfacenos copol\u00edmeros con grupos r-2,2\u00c2\u00bf-dioxi-,1,1\u00c2\u00bf-binaftil y se ha logrado su derivaci\u00f3n qu\u00edmica por funcionalizaci\u00f3n directa sobre las posiciones 6,6\u00c2\u00bf del binaftilo.  los polifosfacenos preparados son \u00f3pticamente activos y han sido completamente caracterizados, encontr\u00e1ndose que en disoluci\u00f3n presentan estructuras helicoidales con sentido preferencial de la h\u00e9lice distribuidos a lo largo de las cadenas, y en estado s\u00f3lido son mesom\u00f3rficos de estructura esm\u00e9ctica con una separaci\u00f3n entre planos que var\u00eda sistem\u00e1ticamente en funci\u00f3n de los substituyentes. su estabilidad configuracional es muy elevada ya que s\u00f3lo experimentan procesos de atropisomerizaci\u00f3n en las proximidades de la temperatura de transici\u00f3n v\u00edtrea (del orden de 300\u00c2\u00bac).  los complejos preparados resultaron muy activos como catalizadores en la transferencia de hidr\u00f3geno entre isopropanol y acetofenona, pero en ning\u00fan caso se observ\u00f3 enantioselectividad,  por lo que cabe concluir que el \u00abbolsillo quiral\u00bb no es estereoqu\u00edmicamente activo en esta reacci\u00f3n.  con el fin de desarrollar un nuevo modelo de catalizador, se han sintetizado otros polifosfacenos \u00f3pticamente activos portadores de grupos pph2 situados en las posic<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Dise\u00f1o de catalizadores polimericos para catalisis soportada enantioselectiva.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Dise\u00f1o de catalizadores polimericos para catalisis soportada enantioselectiva. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Alejandro Presa Soto <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Oviedo<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/10\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li> Carriedo Ule Gabino Alejandro<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: victor Riera gonz\u00e1lez <\/li>\n<li>Mar\u00eda  \u00ed\u00a0ngels Serra albet (vocal)<\/li>\n<li>Antonio Laguna castrillo (vocal)<\/li>\n<li> Miguel san Jos\u00e9 daniel (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Alejandro Presa Soto Con el objetivo de evaluar la actividad enantioselectiva de centros catal\u00edticos situados en los [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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