Preparation of tetrahydroindolizines from pyridinium and isoquinolinium ylides
作者:Alan R. Katritzky、Nicholas E. Grzeskowiak、Julio Alvarez-Builla
DOI:10.1039/p19810001180
日期:——
Carbonyl- and nitrile-stabilised pyridinium and cyclic azonium methylides condense with chalcones to form tetrahydroindolizines and analogous fused pyrrolidines. The stereochemistry is illuminated by 13C and 1H n.m.r. spectroscopy. Several incorrect literature structures are rectified.
羰基和腈稳定的吡啶鎓和环状的偶氮鎓甲基化物与查耳酮缩合,形成四氢吲哚并二苯并类似的稠合吡咯烷。立体化学由13 C和1 H nmr光谱照亮。纠正了一些错误的文献结构。
Experimental and quantum chemical evidences for C–H⋯N hydrogen bonds involving quaternary pyridinium salts and pyridinium ylides
bonds and the elongation of the C–H bond participating in hydrogen bonds estimated by the PM3 and BLYP/6-31G(d,p) calculations. The UV spectra and 1 H NMR spectra of selected ylides have been measured. The solventeffect on the proton chemical shifts of quaternary pyridinium halides and ylides is discussed. Semiempirical and DFT calculations were carried out to investigate the structure of ylides. In ylides
Synthesis and spectral properties of novel cationic fazo dyes and calix[4]arene macromolecule: Application studies towards the cationic dyeing and dye effluent water purification technology
作者:Raju Penthala、Minwoo Han、Ramalingam Manivannan、Young-A Son
DOI:10.1016/j.molstruc.2023.135645
日期:2023.8
results confirm that pyridone cationic dyes exist in hydrazone tautomeric form. Dyeing experiments were performed with these dyes on modacrylic fabrics in an aqueous medium. All three dyes displayed good color strength in acidic pH. The binding interactions between the fiber and dyes have been proposed. Calix[4]arene macromolecule is used to extract these dyes from the wastewater. The removal efficiency
tunnel of ChAT and interactions with a hydrophobic pocket near the choline binding site have major implications for the molecular recognition of inhibitors. Our findings clarify the inhibition mechanism of AVPs, establish a drug modality that exploits a target‐catalysed reaction between exogenous and endogenous precursors, and provide new directions for the development of ChAT inhibitors with improved potency