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Influence of 1,2,4-Tri-tert-butylcyclopentadienyl Ligand on the Reactivity of the Thorium Bipyridyl Metallocene [η5-1,2,4-(Me3C)3C5H2]2Th(bipy)]
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2024-10-03 , DOI: 10.1021/acs.inorgchem.4c02782
Dongwei Wang, Yi Heng, Tongyu Li, Wanjian Ding, Guohua Hou, Guofu Zi, Marc D. Walter

The thorium bipyridyl metallocene (Cp3tBu)2Th(bipy) (1; Cp3tBu = η5-1,2,4-(Me3C)3C5H2) shows a rich reactivity toward a series of small molecules. For example, complex 1 may act as a synthon for the (Cp3tBu)2Th(II) fragment as illustrated by its reactivity toward to CuI, hydrazine derivative (PhNH)2, Ph2E2 (E = S, Se), elemental sulfur (S8) and selenium (Se), organic azides, CS2, and isothiocyanates. Moreover, in the presence of polar multiple bonds, such as those in ketones Ph2CO and (CH2)5CO, aldehydes p-MePhCHO and p-ClPhCHO, seleno-ketone (p-MeOPh)2CSe, nitriles PhCN, Ph2CHCN, C6H11CN, and p-(NC)2Ph, and benzoyl cyanide PhCOCN, C–C coupling occurs to furnish (Cp3tBu)2Th[(bipy)(Ph2CO)] (10), (Cp3tBu)2Th[(bipy)((CH2)5CO)] (11), (Cp3tBu)2Th[(bipy)(p-MePhCHO)] (12), (Cp3tBu)2Th[(bipy)(p-ClPhCHO)] (13), (Cp3tBu)2Th[(bipy){(p-MeOPh)2CSe}] (14), (Cp3tBu)2Th[(bipy)(PhCN)] (16), (Cp3tBu)2Th[(bipy)(Ph2CHCN)] (17), (Cp3tBu)2Th[(bipy)(C6H11CN)] (18), [(Cp3tBu)2Th]2{μ-(bipy)[p-Ph(CN)2](bipy)} (20), and (Cp3tBu)2Th{(bipy)[PhC(CN)O]} (21), respectively. Nevertheless, ketazine (PhCH═N)2 or benzyl nitrile PhCH2CN forms the dimeric complexes [(Cp3tBu)Th]2[μ-NC(Ph)(bipy)]2 (15) and (Cp3tBu)2Th[(bipy){C(═CHPh)NH}] (19), respectively. In contrast, C–N bond cleavage and C–C coupling processes occur upon addition of isonitriles Me3CNC and C6H11NC to 1 to yield the thorium isocyanido amido complexes (Cp3tBu)2Th[4-(Me3C)bipy](NC) (22) and (Cp3tBu)2Th[4-(C6H11)bipy](NC) (23), respectively. Furthermore, a single-electron transfer (SET) process ensues when 1 equiv of CuI is added to 1 to yield the Th(VI) bipyridyl iodide complex (Cp3tBu)2Th(I)(bipy) (3).

中文翻译:


1,2,4-三叔丁基环戊二烯基配体对钍双吡啶基金属反应性的影响 [η5-1,2,4-(Me3C)3C5H2]2Th(bipy)]



钍联吡啶基茂金属 (Cp3tBu2Th(bipy) (1;Cp3tBu = η 5-1,2,4-(Me3C)3C5H2)对一系列小分子表现出丰富的反应性。例如,复合物 1 可以充当 (Cp3tBu2Th(II) 片段的合成子,如其对 CuI、肼衍生物 (PhNH)2、Ph2E2E = S, Se)、元素硫 (S8) 和硒 (Se)、有机叠氮化物、CS2 和异硫氰酸盐的反应性所示。 此外,在极性多重键存在下,例如酮 Ph2CO 和 (CH25CO、醛 p-MePhCHO 和 p-ClPhCHO、硒酮 (p-MeOPh2CSe、腈 PhCN、Ph2CHCN、C6H11CN 和 p-(NC)2Ph 和苯甲酰氰化物 PhCOCN,C-C 偶联发生以提供 (Cp3tBu2Th[(bipy)(Ph2CO)] (10), (Cp3阿拉伯数字Th[(bipy)((CH25CO)] (11), (Cp3tBu2Th[(bipy)(p-MePhCHO)] (12), (Cp3tBu2Th[(bipy)(p-ClPhCHO)] (13), (Cp3tBu2Th[(bipy){(p-MeOPh2CSe}] (14), (Cp3tBu2Th[(bipy)(PhCN)] (16), (Cp3tBu阿拉伯数字Th[(bipy)(Ph2CHCN)] (17), (Cp3tBu2Th[(bipy)(C6H11CN)] (18), [(Cp3tBu2Th]2{μ-(bipy)[p-Ph(CN)2](bipy)} (20) 和 (Cp3tBu2Th{(bipy)[PhC(CN)O]} (21)。然而,氯嗪 (PhCH═N)2 或苄基腈 PhCH2CN 分别形成二聚体复合物 [(Cp3tBuTh]2[μ-NC(Ph)(bipy)]215) 和 (Cp3tBu2Th[(bipy){C(═CHPh)NH}] (19)。 相反,在添加异腈 Me3CNC 和 C6H11NC 比 1 时发生 C-N 键裂解和 C-C 偶联过程,以产生钍异氰基酰胺基络合物 (Cp3tBu2Th[4-(Me3C)bipy](NC) (22) 和 (Cp3tBu2Th[4-(C6H11)bipy](NC) (23) 分别。此外,当 1 当量的 CuI 添加到 1 中以产生 Th(VI) 联吡啶基碘络合物 (Cp3tBu2Th(I)(bipy) 时,会发生单电子转移 (SET) 过程 (3)。
更新日期:2024-10-03
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