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 One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1H)-ones from Primary Alcohols Promoted by Bi(NO3)3·5H2O in Two Different Media: Organic Solvent and Ionic Liquid
作者:Ahmad Reza Khosropour、Ahmad R. Khosropour、Mohammd M. Khodaei、Mojtaba Beygzadeh、Mahbubeh Jokar
DOI:10.3987/com-04-10257
日期:——
A new, simple and efficientprocedure for the one-pot conversion of alcohols instead of aldehydes to the corresponding 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) with Bi(NO 3 ) 3 .5H 2 O as a commercially available, inexpensive, stable and non-toxic reagent in two media, acetonitrile (as an organic solvent) and tetrabutylammonium bromide (as an ionic liquid) is described. This one-pot oxidation-cyclocondensation
The natural organocatalyst phytic acidcatalyzedone-pot Biginelli reactions by coupling β-ketoesters, aldehydes, and (thio)ureas to afford 3,4-dihydropyrimidin-2(1H)-ones/thiones. This phytic acid catalysis featured good to excellent isolated yields, solvent-free conditions, a simple workup, environmental friendliness, and a short reaction time.
Dihydropyrimidones: As novel class of β-glucuronidase inhibitors
作者:Farman Ali、Khalid Mohammed Khan、Uzma Salar、Sarosh Iqbal、Muhammad Taha、Nor Hadiani Ismail、Shahnaz Perveen、Abdul Wadood、Mehreen Ghufran、Basharat Ali
DOI:10.1016/j.bmc.2016.06.002
日期:2016.8
Dihydropyrimidones 1–37 were synthesized via a ‘one-pot’ three component reaction according to well-known Biginelli reaction by utilizing Cu(NO3)2·3H2O as catalyst, and screened for their in vitro β-glucuronidase inhibitory activity. It is worth mentioning that amongst the active molecules, compounds 8 (IC50 = 28.16 ± .056 μM), 9 (IC50 = 18.16 ± 0.41 μM), 10 (IC50 = 22.14 ± 0.43 μM), 13 (IC50 = 34.16 ± 0
Interrogation of 2,2′-Bipyrimidines as Low-Potential Two-Electron Electrolytes
作者:Jeremy D. Griffin、Adam R. Pancoast、Matthew S. Sigman
DOI:10.1021/jacs.0c11267
日期:2021.1.20
demonstrating the propensity of nitrogen-containing heterocycles to undergo multielectron reduction at low potentials, we focused on the development of a novel electrolyte scaffold based upon a 2,2'-bipyrimidine skeleton. This scaffold is capable of storing two electrons per molecule while also exhibiting a low (∼-2.0 V vs Fc/Fc+) reduction potential. A library of 24 potential bipyrimidine anolytes were
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。