Chirality and catalysis with aromatic N-fused heterobicyclic carbenes
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چکیده
منابع مشابه
Chirality and catalysis with aromatic N-fused heterobicyclic carbenes.
The benzoannulation of the most common families of aromatic NHCs, imidazol-2-ylidenes and 1,2,4-triazol-3-ylidenes, results in heterobicyclic imidazo[1,5-a]pyridin-3-ylidenes ('s) and [1,2,4]triazolo[4,3-a]pyridin-3-ylidenes ('s), characterized by a bridged N atom. These are versatile platforms that offer multiple possibilities for the modulation of the steric and electronic properties of the c...
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N-heterocyclic carbenes are a class of persistent carbenes stabilized by adjacent heteroatoms that are part of a heterocycle. They play a central role in multiple enzymatic biosynthetic reactions that involve thiamine diphosphate. Inspired by this biocatalysis machinery, N-heterocyclic carbenes have emerged as one of the most versatile classes of organocatalysts for organic reactions. However, ...
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N–heterocyclic carbenes (NHCs), first isolated by Arduengo et al. in 1991, have become a well-studied and well-utilized class of ligands in the field of transition metal-catalyzed reactions.1 Their proficiency in catalysis, variable electronic properties, and ease of translation into complex architectural structures have allowed for the development of unique reactivity and targeted selectivity....
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The Diels-Alder cycloaddition of dimethyl-1 ,2-cyclobutenedicarboxylate to a 1,3-diene results in the formation of an adduct which can subsequently be decarboxylated and dehydrogenated to provide a cyclobutene-fused benzenoid system. The use of · appropriate dienes has led to the preparation of a series of paraand metabis-annelated benzenes. Variations in the 1H and C NMR and in the UV spectra ...
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N-heterocyclic carbenes (NHCs), typically derived from imidazolium salts, have provided highly powerful ligands for catalysis. Recently, abnormal C4 bonding rather than normal C2 bonding has been discovered as a new carbene bonding mode. We were interested in comparing the consequences of these two bonding modes on the metal center. Therefore we synthesized related palladium complexes 1 and 2 c...
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ژورنال
عنوان ژورنال: Dalton Transactions
سال: 2016
ISSN: 1477-9226,1477-9234
DOI: 10.1039/c6dt01700b