First Pre-Functionalised Polymeric Aromatic Framework from Mononitrotetrakis(iodophenyl)methane and its Applications
作者:Ester Verde-Sesto、Mercedes Pintado-Sierra、Avelino Corma、Eva M. Maya、Jose G. de la Campa、Marta Iglesias、Felix Sánchez
DOI:10.1002/chem.201304163
日期:2014.4.22
Starting frommononitrotetrakis(iodophenyl)methane as monomer, we report the preparation of the first pre‐functionalised porous aromaticframeworks (PAFs) and their application as supports for organometallic catalysts. Neutral coordinate imino‐pyridine Schiff base (PAF‐NPy) or chiral bis‐amino (PAF‐NPro) ligands were obtained by post‐synthetic treatment of PAF‐NH2 and treated with copper(I) or rhodium(I)
Poly(methylhydrosiloxane) as a reductant in the catalytic base-free Wittig reaction
作者:Jan Tönjes、Lars Longwitz、Thomas Werner
DOI:10.1039/d1gc00953b
日期:——
catalytic, base-free Wittigreaction forming highly functionalized alkenes with PMHS as a terminal reductant and butylacetate as a green solvent. Poly(methylhydrosiloxane) (PMHS) is a non-toxic, enviromentally friendly, inexpensive and easy to handle reductant. However, the inherent low reactivity hampers its applicability in catalytic reactions, such as P(III)/P(V) redox cycling reactions. Most of these
Pd-Catalyzed Desulfitative Heck Coupling with Dioxygen as the Terminal Oxidant
作者:Xianya Zhou、Jiaying Luo、Jing Liu、Shengming Peng、Guo-Jun Deng
DOI:10.1021/ol200101x
日期:2011.3.18
A Pd-catalyzed desulfitativeHeck-typereaction of aromatic sulfinicacid sodium salts with various olefins is developed with O2 as the terminal oxidant under mild conditions. The presence of phosphane ligand DPEphos in anisole can significantly enhance the reaction selectivity.
Phosphine-Catalyzed Reaction between 2-Aminobenzaldehydes and Dialkyl Acetylenedicarboxylates: Synthesis of 1,2-Dihydroquinoline Derivatives and Toward the Development of an Olefination Reaction
reacting 2-aminobenzaldehyde derivatives and dialkyl acetylenedicarboxylates with catalytic amounts of phosphine. This reaction was rendered catalytic by the selective in situ phosphine oxide reduction with the use of phenylsilane. Furthermore, with the same starting materials and with an additional role of the reducing agent, a new olefination reaction was discovered. Hydrogen/deuterium (H/D) exchange
New chiral ligands bearing two N-heterocyclic carbene moieties at a dioxolane backbone. Gold, palladium and rhodium complexes as enantioselective catalysts
Biscarbene ligands with two imidazolin-2-ylidene moieties at a chiral dioxolane backbone were used as ligands for gold, rhodium and palladium complexes. All new complexes showed varying degrees of enantioselectivity toward hydrogenation of prochiral alkenes with ees up to 95%.