Facile synthesis of meso-substituted dipyrromethanes and porphyrins using cation exchange resins
作者:Rajan Naik、Padmakar Joshi、Sharada P Kaiwar (nee Vakil)、Rajesh K Deshpande
DOI:10.1016/s0040-4020(03)00245-x
日期:2003.3
crucial role in the synthesis of dipyrromethanes and porphyrins; for the first time, cation exchange resins have been used as heterogeneous solid acid catalysts to produce dipyrromethanes and porphyrins in good yields. The reaction, at room temperature, of substituted aromatic aldehydes with pyrrole catalysed by cation exchange resin afforded the corresponding meso-substituted dipyrromethane in yields ranging
Physicochemical and computational insight of <sup>19</sup>F NMR and emission properties of <i>meso</i>-(<i>o</i>-aryl)-BODIPYs
作者:Mónica Farfán-Paredes、Oscar González-Antonio、Diana E. Tahuilan-Anguiano、Jorge Peón、Armando Ariza、Pascal G. Lacroix、Rosa Santillan、Norberto Farfán
DOI:10.1039/d0nj02576c
日期:——
series of electronic and physicochemical parameters were explored to determine their effect on experimental spectroscopic and photophysical data. Through a systematic obtention of a series of meso-(o-aryl)-BODIPYs, 19F NMR spectra were analyzed and their fluorescence quantum yields in several solvents were measured. Experimental values of 19F chemical shift difference ΔδF correlate well with σ-Hammett constants
探索了一系列电子和理化参数,以确定它们对实验光谱和光物理数据的影响。通过系统地获得一系列内消旋-(o-芳基)-BODIPY,分析了19 F NMR光谱,并测量了它们在几种溶剂中的荧光量子产率。的实验值19 ˚F化学位移差Δ δ ˚F与σ-Hammett常数很好地相关,后者表示氟原子上官能团的感应性质。通过对旋转能垒,静电势图,组电负性,电荷分配和硬度/柔软度的计算DFT探索,可以深入了解这些特征如何与测量的特征直接相关。对这些特性的扩展理解提供了设计论据和结构-性质关系,这将以更有利的方式帮助理解合成分子的特性以及与结构相关的未来尝试。
Towards Alternatives to Anodic Water Oxidation: Basket-Handle Thiolate Fe<sup>III</sup>Porphyrins for Electrocatalytic Hydrocarbon Oxidation
作者:Peiyi Li、Khalaf Alenezi、Saad K. Ibrahim、Joseph A. Wright、David L. Hughes、Christopher J. Pickett
DOI:10.1002/cssc.201200572
日期:2012.12
Selective electrocatalyticoxidation of hydrocarbons to alcohols, epoxides or other (higher value) oxygenates should in principal present a useful complementary anodic half‐cell reaction to cathodic generation of fuels from water or CO2 viz. an alternative to oxygen evolution. A series of new basket‐handle thiolate FeIII porphyrins have been synthesised and shown to mediate anodicoxidation of hydrocarbons
Synthesis of dipyrrolo-diazepine derivatives via intramolecular alkyne cyclization
作者:Dılgeş Baskın、Yasin Çetinkaya、Metin Balci
DOI:10.1016/j.tet.2018.06.013
日期:2018.7
A regioselective approach was developed for the synthesis of dipyrrolo-diazepine derivatives. The synthetic route to dipyrrolo-diazepines first involves the synthesis of dipyrromethanes, followed by reaction of propargyl bromide in the presence of NaH to attach one alkyne functionality to the pyrrole nitrogen atom. Intramolecular heterocyclization with NaH in DMF between the alkyne functionality and