首页> 外文期刊>Chemistry: A European journal >Formation of N-Heterocyclic Carbenes by Tautomerization of Mesomeric Betaines: Cyclic Boron Adducts and Palladium Complexes From 2-(Imidazolium-1-yl)phenolates
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Formation of N-Heterocyclic Carbenes by Tautomerization of Mesomeric Betaines: Cyclic Boron Adducts and Palladium Complexes From 2-(Imidazolium-1-yl)phenolates

机译:通过Mesomeric甜菜碱的互变异构形成N-杂环卡宾:环硼加合物和2-(咪唑-1-基)酚盐的钯配合物。

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摘要

2-(Imidazolium-1-yl)phenolates are conjugated heterocyclic mesomeric betaines in tautomeric equilibrium with the corresponding N-heterocyclic carbenes (NHCs), 3-(2-hydroxyphenyl)-imidazol-2-ylidenes. The carbene tautomers can be trapped as thiones (X-ray analysis). Moreover, bis(triphenylphosphine)palladium(II) dichloride in THF trapped the carbene tautomer as a palladium complex without participation of the phenolate group (X-ray analysis). The corresponding anionic NHCs, 2-phenolate-substituted imidazol-2-ylidenes, can be trapped by triethylborane or triphenylborane to form 4,4-diethyl- or 4,4-diphenyl-4H-benzo[e]imidazo[2,1-c][1,4,2]oxaza-borininium-4-ides, respectively (two X-ray analyses). These tricyclic systems are the first representatives of a new heterocyclic ring system. The results of DFT calculations concerning the HOMO/LUMO profiles and partial charges are also presented.
机译:2-(咪唑-1-基)酚盐与相应的N-杂环卡宾(NHC),3-(2-羟基苯基)-咪唑-2-亚基在互变异构平衡中是共轭的杂环美甜菊。卡宾互变异构体可以作为硫酮被捕集(X射线分析)。此外,THF中的双(三苯基膦)钯(II)二氯化物以钯配合物形式捕获了卡宾互变异构体,而没有酚酸酯基团的参与(X射线分析)。相应的阴离子NHC,2-酚盐取代的咪唑-2-亚烷基可以被三乙基硼烷或三苯基硼烷捕获,形成4,4-二乙基-或4,4-二苯基-4H-苯并[e]咪唑并[2,1-分别为c] [1,4,2]草氮杂硼4-基(两次X射线分析)。这些三环系统是新的杂环系统的第一个代表。还介绍了有关HOMO / LUMO曲线和部分电荷的DFT计算结果。

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