204,922 research outputs found
Agelenopsis riechertii Bosco & Chuang 2018, sp. nov.
No full textAgelenopsis riechertii sp. nov. Figures 1–7Published as part of Bosco, Jennifer M. & Chuang, Angela, 2018, A new species of grass spider, Agelenopsis riechertii, from the Southwestern USA, with notes on its courtship behavior (Araneae: Agelenidae), pp. 579-583 in Zootaxa 4442 (4) on page 580, DOI: 10.11646/zootaxa.4442.4.6, http://zenodo.org/record/130489
»Bosco-Crème«, Frankfurt a. M., Opernhaus
No full text»BOSCO-CRÈME«, FRANKFURT A. M., OPERNHAUS
»Bosco-Crème«, Frankfurt a. M., Opernhaus ( -
»Bosco-Crème«, Frankfurt a. M., Brückenmühle
No full text»BOSCO-CRÈME«, FRANKFURT A. M., BRÜCKENMÜHLE
»Bosco-Crème«, Frankfurt a. M., Brückenmühle ( -
»Bosco-Crème«, Frankfurt a. M., Saalhof
No full text»BOSCO-CRÈME«, FRANKFURT A. M., SAALHOF
»Bosco-Crème«, Frankfurt a. M., Saalhof ( -
APPLICATIONS OF PERCHLORATES IN ORGANIC SYNTHESIS. A NEW AND GENERAL ROUTE TO t-BUTYL ETHERS
No full textAPPLICATIONS OF PERCHLORATES IN ORGANIC SYNTHESIS. A NEW AND GENERAL ROUTE TO t-BUTYL ETHERS
Giuseppe Bartoli, Marcella Bosco, Manuela Locatelli, Paolo Melchiorre and Letizia Sambri
Dipartimento di Chimica Organica “A. Mangini”, v.le Risorgimento 4, Bologna, Italy
[email protected]
In the last few years, we were interested in the use of various metallic perchlorates as Lewis acid promoters in various organic transformations.1 In particular, perchlorate salts have shown a high ability to activate 1,3-dicarbonyl systems.
We surprisingly found that anhydrous Mg(ClO4)2 promotes the reaction of alcohols with t-butyl dicarbonate (Boc2O) to give t-butyl ethers.2 This reaction appears extremely interesting, as it represents a potential solution to a longstanding problem in organic synthesis namely, t-butyl ether formation. The t-butyl ether in fact is “one of the most underused alcohol protecting groups”,3 although it is one of the few ethers stable under strongly basic conditions.
We set up a new protocol for the synthesis of t-butyl ethers from a large variety of functionalized aromatic and aliphatic alcohols. Selective mono-protection of symmetric and asymmetric diols can also be achieved.
At the same time, a convenient deprotection protocol was set up. In fact, t-butyl ethers were easily reconverted in the corresponding alcohols by simple treatment with the CeCl3/NaI system.4
Scheme 1.
1. Bartoli, G.; Boeglin, J.; Bosco, M.; Locatelli, M.; Massaccesi, M.; Melchiorre, P.; Sambri, L. Adv. Synth. Catal. 2005, 347, 33-38. and references herein cited.
2. Bartoli, G.; Bosco, M.; Locatelli, M.; Marcantoni, E.; Melchiorre, P.; Sambri, L. Org. Lett. 2005, 7, 427-430.
3. Greene, T. W.; Wuts, P. G. M in Protective Groups in Organic Synthesis, Wiley, New York, 3rd Ed., 1999, pp. 65-67.
4. Bartoli, G.; Marcantoni, E.; Sambri, L. Synlett, 2003, 2101-2116
Estudio para certificación leed en energía y atmósfera y eficiencia en el uso del agua para el campus de postgrados de la Universidad Don Bosco en Antiguo Cuscatlán.
No full textEn el presente documento se presenta un estudio detallado para verificar la factibilidad de la obtención de una certificación LEED para la Universidad don Bosco – Campus de Postgrados en Antiguo Cuscatlán, El Salvador. La certificación LEED permitiría a dicha institución validar su compromiso con el medio ambiente mediante el método cuantitativo que se sigue con dicha certificación.
El estudio en cuestión está centrado en el tipo de certificación Edificaciones Existentes Operación y Mantenimiento para recintos escolares (LEED EB O+M: Schools). Se utiliza el sistema de calificación y procedimientos más reciente, el LEED v4, el cual se ha comenzado a implementar desde el año 2013. El análisis se ha centrado en dos categorías, en las cuales se estimó que era posible obtener la mayor cantidad de puntos en el corto y mediano plazo
EXPLORING THE GREAT DIVIDE. ANIMALS AND HUMANS IN THE GERMANLANGUAGE LITERATURE
No full textThe recent emergence of the discipline of literary animal studies regards literature in itself as constitutive element of a history of knowledge. The discipline has led not only to the expansion of the corpus of texts traditionally connected with animals, but also established new concepts and methods for revising conventional cultural dichotomies (subject and object, human and animal). The 10 essays collected in this volume are devoted to a wide range of case studies on the relationship between animality and poetics in German-speaking literature since the 18th century. They display a variety of theoretical and methodological approaches to a number of texts packed with references to animals, considered not primarily as objects of literature, but as agents endowed with an active role in the production of literature, and which have left repressed or forgotten traces in texts
On Nahuat-Pipil hermeneutics: a Salvadoran native language under erasure
No full textThis paper examines how a literary national canon is consolidated excluding the study of the most important Native language of the country. Adapting Natives to a folkloric figure and assimilating Otherness to the Same, Nahuat-Pipil linguistic legacy was ignored during the 20th century. The paper reveals a huge disparity between foreign and Salvadoran linguistics. It outlines a scientific discrepancy, as well as it sketches the nationalistic perspectives that timidly approach the study of the Nahuat-Pipil language: P. Arauz (1926/1960) T. Fidias Jiménez (1935), J. Todd (1953), M. de Baratta (1959), P. Geoffroy Rivas (1961). Salvadoran artistic canon invents the figure of a Native without a mother tongue. Indeed, two foreigners accomplished the main grammatical and mythological compilations: Leonhard Schultze-Jena (1935) and Lyle Campbell (1985). For this reason, the advance of Nahuatl-Mexicano studies —with more than four hundred and fifty works (M. León- Portilla in T. Sullivan, 1976) — has barely affected Salvadoran monolingual canon. At the verge of the civil war, the Native’s image was reduced to an ancient inhabitant of Atlantis (Salarrué, 1974) or to a guerrilla fighter (Dalton, 1974), according to the philosophy and politics of the author. Nowadays, despite a new intellectual sphere, current works on Native linguistics (R. Andrews (2003), M. Launay (1994), J. Lockhart (2001), etc.), and ethno-history (L. Matthew and S. Romero, 2012) have not yet produced a radical change in the viewpoint that Salvadoran intellectual history bestows on Nahuat-Pipil language and literature. As a political being —but barely gifted with language— Nahuat-Pipil research is still missing, despite the rise of Central American Cultural Studies. Its hermeneutics —grammatical categories, syntax and poetics— continue to be unexplored
L'evoluzione del complesso monastico nelle aree Sud e Nord
No full textIllustrazione e sintesi dei dati di scavo del monastero di San Benedetto di Len
La palma e la corona.Cultura artistica del secondo settecento a Santa Maria del Bosco
No full textil saggio ripercorre le vicende storico-artistiche dell'abbazia seicentesca di Santa Maria del Bosco, rintracciando le opere disperse in musei, gallerie e sedi istituzional
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