نتایج جستجو برای: electron withdrawing

تعداد نتایج: 310077  

Journal: :The Journal of organic chemistry 2011
Simon Grabowsky Tanja Schirmeister Carsten Paulmann Thomas Pfeuffer Peter Luger

A series of acceptor-substituted epoxide derivatives is scrutinized by means of experimental and theoretical electron-density investigations. Due to the possibility of nucleophilic ring-opening, the epoxide ring is not only a very useful functional group in organic synthesis, but acceptor-substituted epoxides are valuable building blocks for the design of protease inhibitors. Therefore, the ele...

Journal: :Materials advances 2021

Atomic substitution in sidechains of an organic semiconductor show these solubilizing groups are not simple spectators. Silicon is the most electron withdrawing group 14 element, increasing photostability and offering desirable crystal packing.

Journal: :European Journal of Inorganic Chemistry 2021

Catalytic hydroboration of alkynes and alkenes was well demonstrated in the presence neosilyllithium as catalyst pinacolborane, under ambient conditions, to form corresponding alkyl boronic ester products excellent yield. Electron-withdrawing, electron-donating substituents, were tolerated on phenyl rings styrenes. Further, aliphatic substituents yielded desired boronate good quantities. The me...

Four novel receptors were designed and synthesized for colorimetric detection of F− ions. The introduction of four electron withdrawing groups into the backbone of the receptors makes the two phenolic groups efficient hydrogen bonding sites. The binding properties of receptors with anions were examined for the first time by UV–Vis, 1H NMR and fluorescence spectroscopies. The addition of F− resu...

Journal: :Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2021

A series of D-?-A chromophores based on allylidenemalononitrile electron-withdrawing group was designed. The influence the amino-electron-donating photophysical properties studied. These compounds, highly thermally stable, exhibit orange-red emission in solution and solid state. experimental results have been rationalized by theoretical DFT calculations. second order nonlinear optical were also...

Journal: :Dalton transactions 2014
Supawadee Namuangruk Kanokkorn Sirithip Rattanawelee Rattanatwan Tinnagon Keawin Nawee Kungwan Taweesak Sudyodsuk Vinich Promarak Yaowarat Surakhot Siriporn Jungsuttiwong

The charge transfer effect of different meso-substituted linkages on porphyrin analogue 1 (A1, B1 and C1) was theoretically investigated using density functional theory (DFT) and time-dependent DFT (TDDFT) calculations. The calculated geometry parameters and natural bond orbital analysis reveal that the twisted conformation between porphyrin macrocycle and meso-substituted linkages leads to blo...

Journal: :Chemistry 2015
Brittany M deRonde Alexander Birke Gregory N Tew

Cell-penetrating peptides (CPPs) and their synthetic mimics (CPPMs) represent a class of molecules that facilitate the intracellular delivery of various cargo. Previous studies indicated that the presence of aromatic functionalities improved CPPM activity. Given that aromatic functionalities play prominent roles in membrane biology and participate in various π interactions, we explored whether ...

Journal: :Molecules 2017
Dongjun Lv Mingjie Zhang

Two polymer catalysts (Pd-OCMCS and Ni-OCMCS) with good reusability were synthesized by coordinating Pd and Ni onto O-carboxymethyl chitosan (OCMCS). The chemical structure and thermal stability of prepared catalysts were determined by Fourier transform infrared (FT-IR) spectra, Energy Dispersive Spectrometer (EDS)analysis, X-ray diffraction (XRD), and thermogravimetric analyzer (TG-DTG), and t...

Journal: :Applied sciences 2023

Emitting organic molecules can find application in Light-Emitting Diodes and as Biosensors. The new generation of emitters are full conjugated exhibiting conformational freedom that gain emission intensity when accumulate. We synthesized tetraphenyl fulvene (TPF) derivatives by connecting the phenyl rings 3 4 with electron donor groups carbon 6 two electron-withdrawing groups. analyzed optical ...

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