Publication: Nuevos complejos metálicos de carbenos mesoiónicos
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2017-05-18
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Universidad Complutense de Madrid
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Abstract
Se denominan carbenos a aquellas especies químicas neutras que poseen un carbono divalente con seis electrones de valencia. Esta configuración electrónica no cumple la regla del octete, haciendo que estas sustancias sean reactivas e inestables. Durante mucho tiempo, los carbenos se han considerado como intermedios en distintas transformaciones orgánicas, y su aislamiento y caracterización es y ha sido un importante desafío. Arduengo consiguió uno de los grandes hitos en la química de carbenos libres a principio de los años noventa. En este trabajo se resolvió la primera estructura cristalina de un carbeno libre. Se trataba de un anillo de imidazolilideno con un grupo adamantilo unido a cada uno de los átomos de nitrógeno que se encontraban en las posiciones adyacentes al carbono carbénico (Esquema IX.2.1)...
Carbenes are neutral compounds with a divalent carbon that has six valence electrons. Their incomplete octet electron makes these species highly reactive and unstable. They have been considered as transient intermediates in organic transformations, making their isolation and characterisation a major challenge. A milestone in the chemistry of carbenes was achieved in the early 1990s by Arduengo. In this work, the crystalline structure of a free carbene was resolved for the first time. It was an imidazolylidene bearing two adamantyl groups binding the nitrogen atoms adjacent to the carbene carbon (Scheme IX.1.1)...
Carbenes are neutral compounds with a divalent carbon that has six valence electrons. Their incomplete octet electron makes these species highly reactive and unstable. They have been considered as transient intermediates in organic transformations, making their isolation and characterisation a major challenge. A milestone in the chemistry of carbenes was achieved in the early 1990s by Arduengo. In this work, the crystalline structure of a free carbene was resolved for the first time. It was an imidazolylidene bearing two adamantyl groups binding the nitrogen atoms adjacent to the carbene carbon (Scheme IX.1.1)...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Química Orgánica I, leída el 25-10-2016