Search results for "ISOC"
showing 10 items of 301 documents
Reversible complexation of ethylene by a silylene under ambient conditions.
2014
Treatment of toluene solutions of the silylenes Si(SArMe6)2 (ArMe6 = C6H3-2,6(C6H2-2,4,6-Me3)2, 1) or Si(SArPri4)2 (ArPri4 = C6H3-2,6(C6H3-2,6-Pri2)2, 2) with excess ethylene gas affords the siliranes (ArMe6S)2tiebar above startSiCH2tiebar above endCH2 (3) or (ArPri4S)2tiebar above startSiCH2tiebar above endCH2 (4). Silirane 4 evolves ethylene spontaneously at room temperature in toluene solution. A Van’t Hoff analysis by variable-temperature 1H NMR spectroscopy showed that ΔGassn = −24.9(2.5) kJ mol–1 for 4. A computational study of the reaction mechanism using a model silylene Si(SPh)2 (Ph = C6H5) was in harmony with the Van’t Hoff analysis, yielding ΔGassn = −24 kJ mol–1 and an activatio…
Vergleichende kinetische untersuchungen über die basenkatalysierte reaktion von oligomethylen- und oligoäthylenglykolen mit phenylisocyanat
1961
Die durch Triathylamin katalysierte Reaktion von Oligomethylenglykolen und von Oligoathylenglykolen mit Phenylisocyanat in Dioxan bei 25°C wurde untersucht. Die Reaktionsgeschwindigkeit innerhalb der homologen bzw. polymerhomologen Reihe ist unter den angewandten Bedingungen unabhangig von der Kettenlange und der chemischen Struktur der Kette. The reaction of oligomethylene glycols (I) and oligooxyethylene glycols (II) with phenyl isocyanate in dioxane at 25°C. catalyzed by triethylamine was investigated. Under the applied conditions the reaction rate within the homologous and polymerhomologous series is independent of the chain length and the chemical constitution of the chain.
Non-Classical Transformation of Benzendiazonium Hydrogen Sulfates. Access to 1,3-Dimethylisochromeno[4,3-c]pyrazol-5(1H)-one, a Potential Benzodiazep…
2013
The compound 2-((1,3-dimethyl-1H-pyrazol-5-yl)(methyl)carbamoyl)benzene-diazonium hydrogen sulfate (10) was reacted with copper sulfate and sodium chloride, in the presence of ascorbic acid as reducing agent, to afford a mixture of the chlorinated epimers 4′-chloro-2,2′,5′-trimethyl-2′,4′-dihydrospiro[isoindoline-1,3′-pyrazol]-3-one (18) and (19), the epimers 4′-hydroxy-2,2′,5′-trimethyl-2′,4′-dihydrospiro[isoindoline-1,3′-pyrazol]-3-one (20) and (21), and N-(1,3-dimethyl-1H-pyrazol-5-yl)benzamide (22). Under the foregoing conditions, diazonium salt 10 affords neither the 2-chloro-N-(1,3-dimethyl-1H-pyrazol-5-yl)-N-methylbenzamide (23) nor the tricyclic derivative 24, the classical products…
Evaluación del riesgo de reincidencia en menores infractores: herramientas para la mejora de estrategias reeducativas en España
2016
El presente estudio trata de conocer las herramientas que actualmente se utilizan en el ámbito judicial en menores para evaluar el riesgo de reincidencia en España. Para abordar el trabajo se ha realizado una revisión de la literatura existente y se ha llevado a cabo un análisis comparativo de los instrumentos con mayor ascendencia, que permiten identificar dicho riesgo. Tras el análisis, y desde la perspectiva del Trabajo Social, se destaca la herramienta SAVRY puesto que es una herramienta que abarca una gran cantidad de factores y permite el desarrollo de actuaciones efectivas potenciando conductas prosociales que reduzcan el riesgo de de- lincuencia futura. El conocimiento de estas herr…
Fracture Toughness of PIR Foams Produced from Renewable Resources
2012
Rigid low-density closed-cell polyisocyanurate (PIR) foams are used primarily as a thermal insulation material. Traditionally, they are manufactured from constituents produced by petrochemical industry. Introducing renewable materials in PIR formulation brings definite economical and environmental benefits. Fracture toughness of PIR foams obtained from renewable resources (with the polyol system comprising up to 80% of rapeseed oil esters) and petrochemical PIR foams has been characterized experimentally, by compact tension tests, for mode I crack propagation along the rise direction of the foams.
A psychosocial reading of sport actors’ antisocial behaviours : the influence of identity processes
2021
This doctoral work is interested in stakeholder’s antisocial behaviors. This phenomenon is approached by means of the theories bound to the social categorization, and more precisely, the social identity approach and the conception of the social partitions. Following this theoretical development, two mainstudies were led, the second one drawing from the first. A third study was led to reinject the acquired knowledge in the field.The first study, articulating around five sub-studies, aimed at determining the content, the perceived causes, as well as the perceived consequences, of sport stakeholders’ antisocial behaviors. Regarding the content of antisocial behaviors, harm and disadvantage asp…
Use of triacylglycerol profiles established by high performance liquid chromatography with ultraviolet–visible detection to predict the botanical ori…
2011
A method for the determination of triacylglycerols (TAGs) in vegetable oils from different botanical origins by HPLC with UV–vis detection has been developed. Using a core-shell particle packed column (C18, 2.6 micron), TAG separation was optimized in terms of mobile phase composition and column temperature. Using isocratic elution with acetonitrile/n-pentanol at 10 °C, excellent efficiency with good resolution between most of the TAG peak pairs, within a total analysis time of 15 min, was achieved. Using mass spectrometry detection, a total of 15 peaks, which were common to oils of six different botanical origins (corn, extra virgin olive, grapeseed, hazelnut, peanut and soybean) were iden…
La riabilitazione nella ricostruzione del legamento crociato anteriore (seconda parte)
2001
Gli autori descrivono il trattamento riabilitaivo nella ricostruzione del L.C.A. dalla II alla III settimana dopo l'intervento, allorquando inizia la concessione del carico. Sottolineano l'importanza del trattamento propriocettivo per far acquistare al paziente la sensazione di stabilità del ginocchio operato. Rilevano che, agli effetti di un reiserimento ottimale nell'attività agonistica, il riallineamento allo sforzo ed agli stress risulta di rilevante significato. Infine sottolineano il valore degli aspetti psicologici di riabilitazione che non trascurano anche la personalità e le motivazioni del paziente.
Verso l’ottimizzazione dell’attività antiproliferativa di derivati pirroloisochinolinici
2013
On the isochronism of Galilei's horologium
2013
Measuring the passage of time has always fascinated the humankind throughout the centuries. It is amazing how the general architecture of clocks has remained almost unchanged in practice to date from the Middle Ages. However, the foremost mechanical developments in clock-making date from the seventeenth century, when the discovery of the isochronism laws of pendular motion by Galilei and Huygens permitted a higher degree of accuracy in the time measure.