Catalytic Nitrene Homocoupling by an Iron(II) Bis(alkoxide) Complex: Bulking Up the Alkoxide Enables a Wider Range of Substrates and Provides Insight into the Reaction Mechanism
作者:Maryam Yousif、Duleeka Wannipurage、Caleb D. Huizenga、Elizabeth Washnock-Schmid、Nicholas J. Peraino、Andrew Ozarowski、Sebastian A. Stoian、Richard L. Lord、Stanislav Groysman
DOI:10.1021/acs.inorgchem.8b01418
日期:2018.8.6
The reaction of HOR′ (OR′ = di-t-butyl-(3,5-diphenylphenyl)methoxide) with an iron(II) amide precursor forms the iron(II) bis(alkoxide) complex Fe(OR′)2(THF)2 (2). 2 (5–10 mol %) serves as a catalyst for the conversion of aryl azides into the corresponding azoarenes. The highest yields are observed for aryl azides featuring two ortho substituents; other substitution patterns in the aryl azide precursor
Reactivity Modes of an Iron Bis(alkoxide) Complex with Aryl Azides: Catalytic Nitrene Coupling vs Formation of Iron(III) Imido Dimers
作者:James A. Bellow、Maryam Yousif、Alyssa C. Cabelof、Richard L. Lord、Stanislav Groysman
DOI:10.1021/acs.organomet.5b00231
日期:2015.6.22
including the asymmetric one. In contrast, reactions with aryl azides lacking ortho substituents yield stable dimeric iron imido complexes of the form (RO)(THF)Fe(μ-NAr)2Fe(THF)(OR) (Ar = 4-(trifluoromethyl)phenyl, 5; Ar = phenyl, 6; Ar = 3,5-dimethylphenyl, 7), which do not undergo catalytic nitrene coupling. The isocyanide adduct Fe(OR)2(CNR)2 (4, R = 2,6-dimethylphenyl) was obtained from the reaction
发现双(烷氧化物)铁络合物Fe(OR)2(THF)2(R = C t Bu 2 Ph)1具有与各种芳基叠氮化物ArN 3显着不同的反应性。在苯环的邻位具有甲基或乙基的叠氮化物通过氮烯偶合催化反应,生成偶氮芳烃ArNNAr。低至1 mol%的催化剂负载量可在短短4小时内在室温下将纯净的芳基叠氮化物定量转化为偶氮芳烃。两种不同的芳基叠氮化物的组合导致所有三种可能的偶氮芳烃的催化形成,包括不对称的偶氮芳烃。相反,与芳基叠氮化物的反应缺乏邻位取代基产生稳定的二聚铁亚氨基络合物,形式为(RO)(THF)Fe(μ-NAr)2 Fe(THF)(OR)(Ar = 4-(三氟甲基)苯基,5 ; Ar =苯基,6 ; Ar = 3,5-二甲基苯基,7),其不进行催化的氮烯偶联。异氰酸酯加合物Fe(OR)2(CNR)2(4,R = 2,6-二甲基苯基)是由Fe(OR)2(THF)2与两个当量的异氰酸酯反应制得的
N–N Double-Bond Cleavage and Azobenzene Rearrangement with C–C Bond Formation Induced by a Germylene
作者:Ting Yi Lai、James C. Fettinger、Philip P. Power
DOI:10.1021/acs.organomet.2c00258
日期:2022.7.11
The diarylgermylene Ge(ArMe6)2 (ArMe6 = C6H3-2,6-(C6H2-2,4,6-Me3)2) was shown to react with azobenzene at room temperature to yield the Ge(IV) diamido products (ArMe6)2GeN(H)(Ph)-o(Ph)(H)N} (1a) and (ArMe6)2GeN(H)-o-C6H4N(Ph)} (1b), which were characterized via 1H and 13C NMR spectroscopy and by X-ray crystallography. Treatment of Ge(ArMe6)2 with a bulkier diazene, 1,2-bis(2,6-diethylphenyl)diazene
二芳基锗烯 Ge(Ar Me6 ) 2 (Ar Me6 = C 6 H 3 -2,6-(C 6 H 2 -2,4,6-Me 3 ) 2 ) 在室温下与偶氮苯反应生成Ge(IV) 二酰氨基产物 (Ar Me6 ) 2 GeN(H)(Ph)-o(Ph)(H)N} ( 1a ) 和 (Ar Me6 ) 2 GeN(H)-oC 6 H 4 N(Ph)} ( 1b ),通过1 H 和13 C NMR 光谱和 X 射线晶体学进行表征。Ge(Ar)的处理Me6 ) 2具有更大的二氮烯、1,2-双(2,6-二乙基苯基)二氮烯或 1,2-双(1,3,5-三甲基苯基)二氮烯,即使在高温下也不会产生 N-N 键断裂,并且仅观察到锗烯的 C-H 活化。在相同条件下处理类似的锡物质Sn(Ar Me6 ) 2没有反应。
Heterocoupling of Different Aryl Nitrenes to Produce Asymmetric Azoarenes Using Iron–Alkoxide Catalysis and Investigation of the Cis–Trans Isomerism of Selected Bulky Asymmetric Azoarenes
作者:Duleeka Wannipurage、Sudheer S. Kurup、Stanislav Groysman
DOI:10.1021/acs.organomet.1c00490
日期:2021.11.8
variety of aryl nitrenes. While bulky nitrenes featuring ortho substituents were coupled more efficiently, coupling of the less bulky meta- and para-substituted aryl nitrenes was also demonstrated. In contrast, the iron(II) complex of a chelating bis(alkoxide) ligand, Fe[OO]Ph(THF)2, was previously shown to efficiently couple nonbulky aryl nitrenes lacking substituents in ortho positions. In the present
据报道,使用两种不同的铁醇盐催化剂将不同的芳基氮烯(源自有机叠氮化物)进行杂偶联以产生不对称的偶氮芳烃。Fe(OC t Bu 2 (3,5-Ph 2 C 6 H 3 )) 2 (THF) 2先前已被证明可催化多种芳基氮烯的均偶联。虽然具有邻位取代基的庞大的氮烯更有效地偶联,但也证明了体积较小的间位和对位取代的芳基氮烯的偶联。相比之下,螯合双(醇盐)配体 Fe[OO] Ph (THF) 2的铁 (II) 络合物, 以前被证明可以有效地偶联在邻位缺乏取代基的非庞大芳基氮烯。在目前的工作中,我们证明了两种不同的氮烯(总共 10 当量,每个 5 当量)与 Fe(OC t Bu 2 (3,5-Ph 2 C 6 H 3 )) 2 (THF) 2 (10 mol %) 产生了统计或接近统计分布(两种均偶合产物和异偶偶合产物分别为 25:25:50)对于在一个氮烯上包含一个或两个邻位烷基取代基而在另一个上包含一个邻位烷基的各种组合
Quasi-Isomeric Gallium Amides and Imides GaNR<sub>2</sub> and RGaNR (R = Organic Group): Reactions of the Digallene, Ar‘GaGaAr‘ (Ar‘ = C<sub>6</sub>H<sub>3</sub>-2,6-(C<sub>6</sub>H<sub>3</sub>-2,6-Pr<sup>i</sup><sub>2</sub>)<sub>2</sub>) with Unsaturated Nitrogen Compounds
作者:Robert J. Wright、Marcin Brynda、James C. Fettinger、Audra R. Betzer、Philip P. Power
DOI:10.1021/ja063072k
日期:2006.9.1
(p-tolyl), mesityl, and C(6)H(3)-2,6-Et(2)) yielded the 1,2-Ga(2)N(2) ring compound Ar'GaN(p-tolyl)N(p-tolyl)GaA' (3) or the products MesN=NC(6)H(2)-2,4-Me(2)-6-Ga(Me)Ar' (4) and 2,6-Et(2)C(6)H(3)N=NC(6)H(3)-2-Et-6-Ga(Et)Ar' (5). Reaction of GaAr' with N(2)CPh(2) yielded the 1,3-Ga(2)N(2) ring compound Ar'Ga(mu:eta(1)-N(2)CPh(2))(2)GaAr' (6), which is quasi-isomeric to 3. Calculations on simple model isomers