The synthesis and application of a dibenzyl-functionalized bispidine, in combination with 1-(3,5bis(trifluoromethyl)phenyl)-3-cyclohexylthiourea (TU) co-catalyst, has been demonstrated to be an excellent catalyst for the controlled ring-opening polymerisation (ROP) of lactide and cyclic carbonate monomers. Notably, the polymerisation proceeds with negligible transesterification or epimerisation, with the polymerisation of stereopure L-lactide affording highly crystalline poly(lactide) with a T m of 156 C. ROP of racemic lactide results in the observation of a modest degree of stereocontrol such that the probability of isotactic enchainment, P m ¼ 0.74. Comparison of a range of alternative hydrogen bond donor co-catalysts revealed that TU displayed the highest polymerisation rates in combination with the dibenzyl-functionalized bispidine.

The present text sets out to determine the relationships between the concepts of despair and selfhood in Søren Kierkegaard's Sikness unto Death. For this, a hermeneutic, as exhaustive as possible, is applied to the discernment of the concept itself, to later relate it to what the Danish calls despair. After clarifying the relationship between both concepts, examples of the desperate Kierkegaardian man abound in order to verify the irremediable discordance between the constituent elements of the self-given, his unresolved relationship with God.

El objetivo de este ensayo es lograr comprender, en la Fenomenología del espíritu, como se da el primer movimiento dialéctico que acontece en la conciencia en cuanto esta se reconoce como autoconciencia. El análisis que Hegel realiza en los primeros tres capítulos: la certeza sensible, la percepción y la fuerza y el entendimiento, serán abordados aquí, pero solo como antecedentes de la autoconciencia, de ahí que el análisis que se les dedique no sea tan exhaustivo en su abordaje conceptual como el concepto de autoconciencia, núcleo de este apartado.