University of Seville

About: University of Seville is a education organization based out in Seville, Andalucía, Spain. It is known for research contribution in the topics: Population & Context (language use). The organization has 20098 authors who have published 47317 publications receiving 947007 citations. The organization is also known as: Universidad de Sevilla.

C2-symmetric bis-hydrazones as ligands in the asymmetric Suzuki-Miyaura cross-coupling.

Abstract: Glyoxal bis-hydrazone derived from (S,S)-1-amino-2,5-diphenylpyrrolidine behaves as an excellent ligand for phosphine-free, asymmetric Suzuki-Miyaura cross couplings, thereby affording a variety of enantiomerically enriched biaryls with different substitution patterns. The high catalytic activity of the [PdCl2(bis-hydrazone)] complex allows reactions to be performed at room temperature, affording products with excellent enantioselectivities in all cases.

Low Pressure CO2 Hydrogenation to Methanol over Gold Nanoparticles Activated on a CeOx/TiO2 Interface

Abstract: Capture and recycling of CO2 into valuable chemicals such as alcohols could help mitigate its emissions into the atmosphere. Due to its inert nature, the activation of CO2 is a critical step in improving the overall reaction kinetics during its chemical conversion. Although pure gold is an inert noble metal and cannot catalyze hydrogenation reactions, it can be activated when deposited as nanoparticles on the appropriate oxide support. In this combined experimental and theoretical study, it is shown that an electronic polarization at the metal-oxide interface of Au nanoparticles anchored and stabilized on a CeO(x)/TiO2 substrate generates active centers for CO2 adsorption and its low pressure hydrogenation, leading to a higher selectivity toward methanol. This study illustrates the importance of localized electronic properties and structure in catalysis for achieving higher alcohol selectivity from CO2 hydrogenation.

A review of case studies publishing in Management Decision 2003‐2004

Abstract: Purpose – This paper aims to specify a set of methodological stages to conduct case studies. It presents a graphical representation of these stages, describes how it assists management researchers to build theory from data gathered in the field, and outlines its value for achieving sound management research.Design/methodology/approach – A sample of nine cases published in Management Decision within the last two years (2003‐2004) is selected in order to illustrate these processes.Findings – The paper's major contribution to research methodology is to specify a set of guidelines for conducting case studies and being explicit in how to apply a series of quality criteria for evaluating case studies in practice. The proposal not only helps to conduct research, but also documents the links between the research topics (in the conceptual framework), data (observations and interpretations in the field), data analysis (coding using the concepts in the conceptual framework and emergent themes) and the theory and kno...

The influence of perceptions on potential entrepreneurs

Abstract: Much research has tried to explain why some people, but not others, choose to become entrepreneurs. The cognitive approach provides a useful insight to explore the entrepreneur-related phenomena through perceptions and intentions. Cross-national studies of this kind are rare, since large international surveys are needed. In this sense, the GEM-project questionnaire includes some questions about entrepreneurial perceptions of the adult population. Thus, the main objective of this paper is building a theoretical framework of entrepreneurial perceptions and testing their influence on entrepreneurial intentions with GEM data. This may allow overcoming some of the weaknesses of previous studies in entrepreneurial intentions. Three kinds of perceptions are identified: individual perceptions, perceptions about entrepreneurial opportunities, and socio-cultural perceptions. Their effect on intentions is tested along with some control variables. Results confirm that these perceptions are relevant variables in explaining the entrepreneurial intention of individuals across nations. At the same time, results from this paper would contribute to the opening up of a new line of analysis using GEM-project data: the conception stage of the new venture process; that is, the study of potential entrepreneurs.