Results 151 to 160 of about 34,352 (289)
Catalytic Functionalization of Unactivated π‐Bonds Enabled by Bidentate Directing Auxiliaries
Angewandte Chemie, EarlyView.This review explores how bidentate directing auxiliaries have advanced transition‐metal catalysis for unactivated alkene/alkyne functionalization. By leveraging chelated intermediates, bidentate directing auxiliaries enable precise hydrofunctionalization, difunctionalization, and C─H activation of π‐bonds with unique selectivity and reactivity.
Seunghyeon Cho +4 more
wiley +2 more sources
Angewandte Chemie, EarlyView.We report a heterogeneous double hydrogen bond/photoredox synergistic catalysis, wherein the flexibility and spatial orientation of catalytic centers, rather than catalyst activity, play a dominant role in catalytic performance. ABSTRACT Catalyst activity is typically the primary priority in designing a catalytic system. The higher catalyst activity is
Jing Ouyang +8 more
wiley +2 more sources
Pyridine C─N Transposition via Cycloaddition–Cycloreversion
Angewandte Chemie, EarlyView.Transposition of pyridine nitrogen from the 4‐ to the 3‐position is described using two open and shut sequences: a nucleophile addition ring‐open ring‐closure, followed by a nitrile Diels–Alder cycloaddition cycloreversion. The nitrogen swap is particularly effective for tertiary alkyl substituents, transforming easily accessible para‐alkylated ...
Aífe Conboy, Michael F. Greaney
wiley +2 more sources
Sílabo de Precedentes Judiciales en Materia Penal [PDF]
Precedentes Judiciales en Materia Penal es una asignatura obligatoria y de especialidad para los estudiantes de la EAP de Derecho. Es prerrequisito de la asignatura Seminario de Derecho Penal y Procesal Penal y se ubica en el décimo primer período de ...
Universidad Continental
core
Angewandte Chemie, EarlyView.Induced by positive electrochemical potentials, thermocatalytic hydrogenation (TCH) of 3‐nitrostyrene with H2 delivers one single product with six‐fold enhanced yield. The enhanced selectivity and activity originate from changes in the adsorption geometry of 3‐nitrostyrene and in the surface concentration of 3‐nitrostyrene and hydrogen via a concurrent
Yunfei Jiao +2 more
wiley +2 more sources
, 2018 El análisis del precedente jurisprudencial de la Corte Constitucional colombiana respecto de su postura en relación con las áreas de acción estatal: verdad, justicia, reparación y garantías de no repetición, para la reparación de las víctimas del conflicto armado en el marco de la justicia transicional se desarrolla con base en veinte (20) sentencias ...
openaire +1 more source
Direct δ‐Lactone Synthesis From Free Alcohols via Photoinduced δ‐C(sp3)–H Carbonylation in Flow
Angewandte Chemie, EarlyView.Herein, we have developed a photo‐flow platform for the δ‐C(sp3)─H carbonylative lactonization of free alcohols with carbon monoxide. The transformation integrates alkoxyl radical generation, selective 1,5‐HAT, CO incorporation, and radical–polar crossover to enable direct access to δ‐lactones from simple alcohol precursors.
Prakash Chandra Tiwari +2 more
wiley +2 more sources
Precedentes administrativos no direito brasileiro
, 2013 O tema desta dissertação de mestrado são os precedentes administrativos, cujo estudo, apesar de escasso em nosso país, revelou ser um instrumento valioso para a consecução do espírito que norteia o Direito Administrativo: a garantia dos cidadãos contra ...
Carvalho, Gustavo Marinho de
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, 2016 El precedente en el ordenamiento colombiano, como principio general en el cual se apoyan los jueces para dictar sus decisiones, tanto en materia constitucional como en materia contencioso administrativa, no es uno solo, corresponde actualmente a dos corrientes, que generan tensión y conflicto, en un permanente «choque de trenes».
openaire +2 more sources