{"id":118691,"date":"2022-07-11T18:08:39","date_gmt":"2022-07-11T18:08:39","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudi-teoric-del-mecanisme-de-les-cicloaddicions-22\/"},"modified":"2022-07-11T18:08:39","modified_gmt":"2022-07-11T18:08:39","slug":"estudi-teoric-del-mecanisme-de-les-cicloaddicions-22","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/estudi-teoric-del-mecanisme-de-les-cicloaddicions-22\/","title":{"rendered":"Estudi teoric del mecanisme de les cicloaddicions 2+2."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Miguel Duran Portas <\/strong><\/h2>\n<p>Mediante el metodo semiempirico minao\/3 se estudia la reaccion de dimerizacion del etileno  realizandose tambien algunos calculos ab inido sto-36. Mediante el primer metodo  se analiza la influencia de substituyentes dadores y aceptores de electrones en dicha reaccion  asi como el efecto de la soluatacion y de la catalisis sobre algunas reacciones 2+2 polares. Dos tipos de mecanismos son encontrados. Para las reacciones con poco caracter polar  el mecanismo transcurre a una sola etapa con la formacion de un estado de transicion que presenta una interaccion tricentrica. Para las reacciones mas polares el mecanismo es a dos etapas con una segunda barrera determinante de la barrera de la reaccion. En este caso aparece una gran transferencia de carga  presentando el intermedio cierto caracter zwitterionico. Cuando se a\u00f1ade el efecto de un disolvente polar o de catalizadores (acidos de cewis)  disminuye la barrera y aumenta la tr.  carga.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudi teoric del mecanisme de les cicloaddicions 2+2.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudi teoric del mecanisme de les cicloaddicions 2+2. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Miguel Duran Portas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1984<\/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>Juan Bertr\u00e1n Rusca<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan Bertr\u00e1n Rusca <\/li>\n<li>Jaime Olivella Nello (vocal)<\/li>\n<li>Marcial Moreno Ma\u00f1as (vocal)<\/li>\n<li>Antonio Oliva Cuy?s (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Miguel Duran Portas Mediante el metodo semiempirico minao\/3 se estudia la reaccion de dimerizacion del etileno realizandose [&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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