随着可再生能源的利用不断扩大,对氧化还原液流电池(RFB)等新型电网储能技术的需求将变得至关重要。最终,RFB 的能量密度将取决于各个电解质的氧化还原电位、它们的溶解度以及每个分子存储的电子数量。先前的文献报道证明了含氮杂环在低电位下发生多电子还原的倾向,我们专注于开发基于2,2'-联嘧啶骨架的新型电解质支架。该支架能够每个分子存储两个电子,同时还表现出较低的还原电位(~-2.0 V vs Fc/Fc+)。合成并系统评估了 24 种潜在联嘧啶阳极电解液的库,以通过计算评估揭示结构-功能关系。通过对这些关系的分析,发现在还原态下破坏系统平面性的空间相互作用可能是导致某些阳极电解液更高水平降解的原因。最终确定主要分解途径是溶剂对二价阴离子的质子化,这可以通过电化学或化学氧化来逆转。为了验证应变诱导分解的假设,合成并评估了两种具有最小空间阻碍的新电解质,并发现它们确实比其空间位阻对应物表现出更高的稳定性。
随着可再生能源的利用不断扩大,对氧化还原液流电池(RFB)等新型电网储能技术的需求将变得至关重要。最终,RFB 的能量密度将取决于各个电解质的氧化还原电位、它们的溶解度以及每个分子存储的电子数量。先前的文献报道证明了含氮杂环在低电位下发生多电子还原的倾向,我们专注于开发基于2,2'-联嘧啶骨架的新型电解质支架。该支架能够每个分子存储两个电子,同时还表现出较低的还原电位(~-2.0 V vs Fc/Fc+)。合成并系统评估了 24 种潜在联嘧啶阳极电解液的库,以通过计算评估揭示结构-功能关系。通过对这些关系的分析,发现在还原态下破坏系统平面性的空间相互作用可能是导致某些阳极电解液更高水平降解的原因。最终确定主要分解途径是溶剂对二价阴离子的质子化,这可以通过电化学或化学氧化来逆转。为了验证应变诱导分解的假设,合成并评估了两种具有最小空间阻碍的新电解质,并发现它们确实比其空间位阻对应物表现出更高的稳定性。
A mild and practical method for the regioselective synthesis of N-acylated 3,4-dihydropyrimidin-2-ones. New acyl transfer reagents
作者:Kamaljit Singh、Sukhdeep Singh
DOI:10.1016/j.tetlet.2006.09.039
日期:2006.11
The treatment of 3,4-dihydropyrimidin-2-ones with n-BuLi at −78 °C, followed by quenching with various electrophiles furnished N3-substituted derivatives, regioselectively. Further, N1,N3-diacyl derivatives were found to transfer N1-acyl groups to nucleophilic sites.
Novel chiral stationary phases based on 3,5‐dimethyl phenylcarbamoylated β‐cyclodextrin combining cinchona alkaloid moiety
作者:Lunan Zhu、Junchen Zhu、Xiaotong Sun、Yaling Wu、Huiying Wang、Lingping Cheng、Jiawei Shen、Yanxiong Ke
DOI:10.1002/chir.23237
日期:2020.8
Novelchiral selectors based on 3,5‐dimethylphenylcarbamoylatedβ‐cyclodextrin connecting quinine (QN) or quinidine (QD) moiety were synthesized and immobilized on silica gel. Their chromatographic performances were investigated by comparing to the 3,5‐dimethylphenylcarbamoylatedβ‐cyclodextrin (β‐CD) chiralstationaryphase (CSP) and 9‐O‐(tert‐butylcarbamoyl)‐QN‐based CSP (QN‐AX). Fmoc‐protected
Dihydropyrimidinones: efficient one-pot green synthesis using Montmorillonite-KSF and evaluation of their cytotoxic activity
作者:Saleem Farooq、Fahad A. Alharthi、Ali Alsalme、Aashiq Hussain、Bashir A. Dar、Abid Hamid、S. Koul
DOI:10.1039/d0ra09072g
日期:——
A simple, efficient, cost-effective, recyclable and green approach has been developed for the synthesis of new dihydropyrimidinone analogs via the Biginelli reaction. The methodology involves a multicomponent reaction catalyzed by “HPA-Montmorillonite-KSF” as a reusable and heterogeneous catalyst. This method gives an efficient and much improved modification of the original Biginelli reaction, in terms
Ruthenium(III) Chloride-Catalyzed One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1<i>H</i>)-ones under Solvent-Free Conditions
作者:Surya K. De、Richard A. Gibbs
DOI:10.1055/s-2005-869899
日期:——
Ruthenium(III) chloride efficiently catalyzes the three-component Biginelli reaction of an aldehyde, a β-keto ester, and urea or thiourea under solvent-free conditions to afford the corresponding 3,4-dihydropyrimidine-2-(1H)-ones in excellent yields.