Synthesis of unsymmetrical benzotrichalcogenophenes by N-heterocyclic carbene–palladium-catalyzed intramolecular direct C3-arylation of chalcogenophenes
作者:Shi-Yen Chen、Yu-Chieh Pao、Santosh K. Sahoo、Wen-Chia Huang、Yu-Ying Lai、Yen-Ju Cheng
DOI:10.1039/c7cc08852c
日期:——
A series of new unsymmetrical benzotrichalcogenophenes (BTCs) were synthesized by the Pd–N-heterocyclic carbene catalyzed intramolecular C3-arylation of furan, thiophene, selenophene and tellurophene units.
ASYMMETRIC BENZOTRICHALCOGENOPHENE COMPOUND, SYNTHESIS METHOD THEREOF AND POLYMER
申请人:NATIONAL CHIAO TUNG UNIVERSITY
公开号:US20180237452A1
公开(公告)日:2018-08-23
A synthesis method of benzotrichalcogenophene (BTC) includes using a tetrakis(triphenylphosphine)palladium (Pd(PPh
3
)
4
) catalyst and a [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene]chloro[3-phenylallyl]palladium(II) (Pd—IPr) catalyst. The asymmetric benzotrichalcogenophene compound is a heterocyclic compound having furan, thiophene, selenophene and/or tellurophene subunits.
Anion Recognition by Neutral Chalcogen Bonding Receptors: Experimental and Theoretical Investigations
作者:Encarnación Navarro‐García、Bartomeu Galmés、María D. Velasco、Antonio Frontera、Antonio Caballero
DOI:10.1002/chem.201905786
日期:2020.4.9
The utilization of neutral receptors for the molecular recognition of anions based on chalcogen bonding (ChB) is an undeveloped area of host-guest chemistry. In this manuscript, the synthesis of two new families of sulfur, selenium, and tellurium-based ChB binding motifs are reported. The stability of the thiophene, selenophene, and tellurophene binding motifs has enabled the determination of the association
利用中性受体用于基于硫族元素键(ChB)的阴离子分子识别是宿主-客体化学领域中一个尚未开发的领域。在此手稿中,报告了两个新的硫,硒和碲基ChB结合基序家族的合成。噻吩,硒烯和碲烯结合基序的稳定性使得能够通过1 H,77 Se和125 Te NMR实验确定极性非质子溶剂THF中ChB卤化物阴离子结合的缔合常数。使用两个不同的芳族核,并结合一个或两个Ch结合基序,目的是封装阴离子,提供多达两个同时存在的硫属元素键。理论计算和NMR实验表明,对于S和Se受体,与硫族元素原子相邻的酸性H原子所涉及的氢键相互作用在能量上优于ChB相互作用。但是,对于碲醚结合基序,σ-孔相互作用是竞争性的,并且比氢键更受青睐。
Anion recognition by a bidentate chalcogen bond donor
作者:Graham E. Garrett、Elisa I. Carrera、Dwight S. Seferos、Mark S. Taylor
DOI:10.1039/c6cc04818h
日期:——
An ethynylene-linked bis(tellurophene) acts as an anion receptor through bidentate chalcogen bonding interactions.
oxidized into halogen adducts T1•X2 (X=Cl, Br, I) with the formation of two Te−X bonds. The halides in the adducts can be exchanged by lighter ones, but not vice versa. The stabilities of the oxidized products are in the order of T1•Cl2>T1•Br2>T1•I2, which are consistent with the calculated rate constants and energy barriers of the elimination reactions.