Synthesis of 1,3-bis(organylchalcogeno)propanes and 1,2-dichalcogenolanes having different chalcogen atoms in the molecule
作者:A. V. Elaev、V. A. Grabel’nykh、N. V. Russavskaya、L. V. Klyba、E. R. Zhanchipova、E. P. Levanova、E. N. Sukhomazova、A. I. Albanov、T. V. Mamaseva、N. A. Korchevin
DOI:10.1134/s1070363207010124
日期:2007.1
Oligomeric trimethylene dichalcogenides and the corresponding 1,2-dichalcogenolanes having both similar and different chalcogen atoms in the molecule were synthesized by reactions of 1-bromo-3-chloropropanes with two elemental chalcogens (S, Se; S, Te; Se, Te) activated by the system hydrazine hydrate-alkali. Reductive cleavage of the oligomeric products in the system hydrazine hydrate-alkali, followed by alkylation with methyl iodide or ethyl bromide gave 1,3-bis(alkylchalcogeno)propanes. The latter were also obtained from the corresponding dialkyl dichalcogenides and 1-bromo-3-chloropropane in the alkaline reducing system.
Synthesis, Structure, and Chemistry of New, Mixed Group 14 and 16 Heterocycles: Nucleophile-Induced Ring Contraction of Mesocyclic Dications
作者:Eric Block、Evgeny V. Dikarev、Richard S. Glass、Jin、Bo Li、Xiaojie Li、Shao-Zhong Zhang
DOI:10.1021/ja065037j
日期:2006.11.1
More than 40 new 4- to 12-membered ring heterocycles containing various combinations of Group 14 and 16 elements Si, Sn, S, Se, and Te have been synthesized and fully characterized. Synthesis of these small-ring as well as medium-ring (mesocyclic) heterocycles from alpha,omega-dihalides is facilitated by the presence of gem-dialkylsilyl and gem-dialkylstannyl groups in the precursors. Conformations
Synthesis and Characterization of [FeFe]‐Hydrogenase Models with Bridging Moieties Containing (S, Se) and (S, Te)
作者:Mohammad K. Harb、Helmar Görls、Taka Sakamoto、Greg A. N. Felton、Dennis H. Evans、Richard S. Glass、Dennis L. Lichtenberger、Mohammad El‐khateeb、Wolfgang Weigand
DOI:10.1002/ejic.201000278
日期:2010.9
[FeFe]-hydrogenase-active-site modelscontaining larger chalcogens such as Se or Te have exhibited greater electron richness at the metal centers and smaller gas-phase ionization energies and reorganization energies relative to moleculescontaining S atoms. Diiron complexes related to the much-studied molecule [Fe 2 (μ-SC 3 H 6 S)(CO) 6 ] (1) have been prepared with one S atom replaced either by one
[FeFe]-氢化酶活性位点模型包含较大的硫属元素(如 Se 或 Te),在金属中心表现出更高的电子丰富度,并且相对于含有 S 原子的分子具有更小的气相电离能和重组能。与研究较多的分子 [Fe 2 (μ-SC 3 H 6 S)(CO) 6 ] (1) 相关的二铁配合物已经制备,其中一个 S 原子被一个 Se 原子取代,得到 [Fe 2 (μ- SC 3 H 6 Se)(CO) 6 ] (2) 或由一个 Te 原子得到 [Fe 2 (μ-SC 3 H 6 Te)(CO) 6 ] (3)。这些分子已通过使用质谱法和 13 C 1 H} NMR、77 Se 1 H} NMR、IR 和光电子光谱技术以及用单晶 X 射线衍射、电化学测量和DFT 计算。He I 光电子谱和 2 和 3 的 DFT 计算表明,相对于全硫配合物 1 的电离能降低,表明金属中心的电子丰富度增加,有利于弱酸质子的电催化还原以产生