n -杂环革烯:普遍存在的n -杂环碳烯的一些重类似物的结构表征

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Christopher A. Dodds, A. Kennedy, M. Spicer
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引用次数: 3

摘要

三种n -杂环germyene (NHGes)的x射线晶体结构已经被阐明,包括先前未知的1,3-双(2,6-二甲基苯基)重氮agermol-2-ylidene(1)。此外,先前合成的1,3-双(2,4,6-三甲基苯基)重氮agermol-2-ylidene(2)和1,3-双(2,6-二异丙基苯基)重氮agermol-2-ylidene(3)的x射线晶体结构也被报道。化合物1 ~ 3的离散分子结构具有可比性,其Ge-N键长在1.835 ~ 1.875 Å之间,而N-Ge-N键角在83.6 ~ 85.2°之间。将化合物2与类似的n -杂环碳化合物1,3-双(2,4,6-三甲基苯基)咪唑-2-酰基(IMes)进行比较。正如预期的那样,观察到的主要几何差异是二价基团14原子周围的键角。化合物2的N-Ge-N键角为83.6°,而itimes的N-C-N键角为101.4°。也合成了(1),1,3-二(2,6-二甲基苯基)二氮杂丹醇-2-酰基(4)的锡当量,并报道了其晶体结构。为了测试它们作为配体的适宜性,化合物1至3与各种过渡金属配合物反应。未观察到含金属配合物的NHGes。在所有情况下,NHGe要么降解,要么不发生反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
N-Heterocyclic Germylenes: Structural Characterisation of Some Heavy Analogues of the Ubiquitous N-Heterocyclic Carbenes
The X-ray crystal structures of three N-heterocyclic germylenes (NHGes) have been elucidated including the previously unknown 1,3-bis(2,6-dimethylphenyl)diazagermol-2-ylidene (1). In addition, the X-ray crystal structures of the previously synthesised 1,3-bis(2,4,6-trimethylphenyl)diazagermol-2-ylidene (2) and 1,3-bis(2,6-diisopropylphenyl)diazagermol-2-ylidene (3) are also reported. The discrete molecular structures of compounds 1 to 3 are comparable, with Ge-N bond lengths in the range 1.835-1.875 Å, while the N-Ge-N bond angles range between 83.6 and 85.2°. Compound 2 was compared to the analogous N-heterocyclic carbene species, 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes). The major geometrical difference observed, as expected, was the bond angle around the divalent group 14 atom. The N-Ge-N bond angle was 83.6° for compound 2 versus the N-C-N bond angle of 101.4° for IMes. The Sn equivalent of (1), 1,3-bis(2,6-dimethylphenyl)diazastannol-2-ylidene (4), has also been synthesised and its crystal structure is reported here. In order to test their suitability as ligands, compounds 1 to 3 were reacted with a wide range of transition metal complexes. No NHGes containing metal complexes were observed. In all cases the NHGe either degraded or gave no reaction.
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来源期刊
Heteroatom Chemistry
Heteroatom Chemistry 化学-化学综合
CiteScore
1.20
自引率
0.00%
发文量
5
审稿时长
6 months
期刊介绍: Heteroatom Chemistry brings together a broad, interdisciplinary group of chemists who work with compounds containing main-group elements of groups 13 through 17 of the Periodic Table, and certain other related elements. The fundamental reactivity under investigation should, in all cases, be concentrated about the heteroatoms. It does not matter whether the compounds being studied are acyclic or cyclic; saturated or unsaturated; monomeric, polymeric or solid state in nature; inorganic, organic, or naturally occurring, so long as the heteroatom is playing an essential role. Computational, experimental, and combined studies are equally welcome. Subject areas include (but are by no means limited to): -Reactivity about heteroatoms for accessing new products or synthetic pathways -Unusual valency main-group element compounds and their properties -Highly strained (e.g. bridged) main-group element compounds and their properties -Photochemical or thermal cleavage of heteroatom bonds and the resulting reactivity -Uncommon and structurally interesting heteroatom-containing species (including those containing multiple bonds and catenation) -Stereochemistry of compounds due to the presence of heteroatoms -Neighboring group effects of heteroatoms on the properties of compounds -Main-group element compounds as analogues of transition metal compounds -Variations and new results from established and named reactions (including Wittig, Kabachnik–Fields, Pudovik, Arbuzov, Hirao, and Mitsunobu) -Catalysis and green syntheses enabled by heteroatoms and their chemistry -Applications of compounds where the heteroatom plays a critical role. In addition to original research articles on heteroatom chemistry, the journal welcomes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.
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