Search results for "Crafts"
showing 10 items of 101 documents
9,10-Phenanthrenedione as Visible-Light Photoredox Catalyst: A Green Methodology for the Functionalization of 3,4-Dihydro-1,4-Benzoxazin-2- Ones thro…
2018
A visible-light photoredox functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones through a Friedel-Crafts reaction with indoles using an inexpensive organophotoredox catalyst is described. The reaction uses a dual catalytic system that is formed by a photocatalyst simple and cheap, 9,10-phenanthrenedione, and a Lewis acid, Zn(OTf)2. 5W white LEDs are used as visible-light source and oxygen from air as a terminal oxidant, obtaining the corresponding products with good yields. The reaction can be extended to other electron-rich arenes. Our methodology represents one of the most valuable and sustainable approach for the functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones, as compared to th…
Beyond Health and Happiness : An Exploratory Study Into the Relationship Between Craftsmanship and Meaningfulness of Sport
2021
Meaning in movement is an enduring topic in sport social sciences, but few studies have explored how sport is meaningful and for whom. The authors examined the relationships between demographic variables, meaningfulness of sport, and craftsmanship. Athletes (N = 258, 61.6% male, age ≥18) from the United Kingdom completed a demographic questionnaire, the Work and Meaning Inventory modified for sport, and the Craftsmanship Scale. Older age and individual sport significantly correlated with higher craftsmanship. Craftsmanship and religion were two independent predictors of meaningfulness, but emphasized somewhat different meaning dimensions. Meaningfulness in sport seems to be related to how a…
Teacher educators' collective professional agency and identity : Transforming marginality to strength
2017
Abstract This study investigated teacher educators' collective professional agency and identity within an identity coaching programme. The participants in the programme were teacher educators from the field of arts and crafts education. Through a shared process involving increased trust and togetherness, the teacher educators became empowered in terms of their collective identity and agency. The study points to the importance of addressing individual narratives and learning pathways in seeking to understand emergent collective agency and identity in professional contexts. Our theoretical contribution includes an advanced understanding of collective identity and agency, and of their close re…
L'alimentation carnée à Aventicum/Avenches capitale des Helvètes (Ier s. - IVe s. apr. J.-C.) Suisse, canton de Vaud
2010
This first synthesis concerns the animal bones, discovered since 1975 in Aventicum, the capital of Roman Switzerland. It is supported by the analysis of several residential districts, public sectors and suburbs, which represent five hundred chronological complexes and 74000 animal bones, dated from the Ist, to the IVth Century AD. During these centuries, Aventicum was incorporated to the Roman province of Gallia Belgica, then was raised to the status of a colonia and finally declined with the Empire.The analysis of bones was made to study various mutations which occurred during the occupation of the city. They include an improvement of breeding techniques, a new internal city organisation, …
ChemInform Abstract: Organocatalytic Enantioselective Friedel-Crafts Alkylation of 1-Naphthol Derivatives and Activated Phenols with Ethyl Trifluorop…
2016
Financial support from the MINECO [Gobierno de Espana and FEDER (EU)] (CTQ2013-47949-P) and from Generalitat Valenciana (ISIC2012/001) is gratefully acknowledged. M.M.-M. thanks the Universitat de Valencia for a predoctoral grant. C. V. thanks MINECO for JdC contract. Access to NMR and MS facilities from the Servei central de support a la investigacio experimental (SCSIE)-UV is also acknowledged.
Organocatalytic asymmetric addition of naphthols and electron-rich phenols to isatin-derived ketimines: highly enantioselective construction of tetra…
2015
A quinine-derived thiourea organocatalyst promoted the highly enantioselective addition of naphthols and activated phenols to ketimines derived from isatins. The reaction afforded chiral 3-amino-2-oxindoles with a quaternary stereocenter in high yields (up to 99%) with excellent enantioselectivity (up to 99% ee). To the best of our knowledge, this transformation is the first highly enantioselective addition of naphthols to ketimines
Arte Textil y tradición en la Provincia de Catamarca, Noroeste Argentino
2019
espanolLas tradiciones textiles en la Provincia de Catamarca, constituyen parte de una identidad cultural conformada a partir de elementos muy pujantes provenientes de distinto origen. Estos se traslucen tanto en estilos y tecnicas de piezas de exquisita estetica y calidad. Evidencian ademas, la historia de las industrias y manufacturas textiles que aportaron al desarrollo de esta actividad, considerada por sus habitantes como parte de su idiosincracia que -lamentablemente- con los anos tiende a desaparecer. EnglishThe textile traditions in the province of Catamarca, are part of a cultural identity formed from very vigorous elements from different origins. These are permeated both styles an…
Synthesis of Functionalized Indoles with an α-Stereogenic Ketone Moiety Through an Enantioselective Friedel-Crafts Alkylation with (E)-1,4-Diaryl-2-b…
2009
Chiral complexes of BINOL-based ligands with hafnium tert-butoxide catalyze the enantioselective Friedel-Crafts alkylation of indoles with (E)-1,4-diaryl-2-butene-1,4-diones at room temperature, with good yields and ee up to 94%. Hafnium(IV) was found to be a more effective Lewis acid than other frequently used metal ions such as titanium(IV) or zirconium(IV). Unlike the enantioselective Friedel-Crafts alkylation of indoles with α,β-unsaturated compounds where the stereogenic center is generated in the β-position to a carbonyl group, the Friedel-Crafts alkylation with 2-butene-1,4-diones described here generates an α-stereogenic center with respect to one of the carbonyl groups. This can be…
Vierzehnter Jahresbericht des Gewerbevereins zu Riga für das Jahr 1879: vorgelegt der Generalversammlung des Vereins am 25. Februar 1880
1880
Tandem Organocatalytic Cycloaromatization/Intramolecular Friedel-Crafts Alkylation Sequence for the Synthesis of Indolizinones and Pyrrolo-azepinone …
2019
The organocatalytic synthesis of indolizinones and pyrrolo-azepinones has been accomplished in a tandem fashion through a sequence that comprises initial cycloaromatization followed by intramolecular Friedel-Crafts alkylation. The process takes place under Bronsted acid catalysis, giving rise to final products in moderate to good yields. Attempts to carry out the tandem protocol in an enantioselective fashion were performed with chiral (R)-BINOL-derived N-triflyl phosphoramides. After initial optimization, the tandem process took place with moderate levels of enantioselectivity.