Substitution of Thiophene Oligomers with Macrocyclic End Caps and the Colorimetric Detection of Hg(II)
摘要:
Alkyl substitution at the a position(s) of mono-, bi-, and terthiophenes via electrophilic addition of macrocyclic end caps combines linear, pi-conjugated aromatic compounds and annular macrocycles. Addition of the Hg(II) ion to terthiophene adducts produces intense color changes, allowing for the selective, colorimetric detection of mercury(II). Chemical oxidation of the asymmetric terthiophene adduct produces the sexithiophene oligomer.
Preparation of onium salts of a reduced anthracenone crown ether macrocycle: a reactivity series involving pyridine, phosphine, thiophene, nitrile and primary amide nucleophiles
作者:Kadarkaraisamy Mariappan、Gerald Caple、Prem N. Basa、Andrew G. Sykes
DOI:10.1002/poc.2902
日期:2012.8
ammonium, phosphonium, thiophene, and amide adducts via a carbocation intermediate. X‐ray crystallography confirms the structures of the products, including those when two competing nucleophiles are present. A reactivityseries that mirrors the nucleophilicity index, where reactivity decreases in the order thiophene > pyridine > primary amides > alkyl nitriles >> aromatic nitriles (unreactive), results