Novel Synthesis of Protected Thiol End-Capped Stilbenes and Oligo(phenylenevinylene)s (OPVs)
摘要:
The first general procedures for preparation of thiol end-capped stilbenes and oligo(phenylene-vinylene)s (OPVs) with tert-butyl- and acetyl-protected thiol termini have been developed. These reactions proceed via Br/Li exchange, McMurry, and Wittig-type reactions. The thiol functionality is protected against strong basic and acidic reaction conditions as a t-Bu sulfide. As a key point in the method, reprotection of the thiol group is accomplished by means of acetyl chloride and boron tribromide. The novel strategy forms the basis for stepwise introduction of 4-mercaptostyryl units in OPVs. The new mono-, di-, and trimercapto OPVs have potential applications as one, two, and three terminal molecular devices in gold nanoparticle clusters, self-assembled monolayers, and optoelectronic devices.
Novel Synthesis of Protected Thiol End-Capped Stilbenes and Oligo(phenylenevinylene)s (OPVs)
摘要:
The first general procedures for preparation of thiol end-capped stilbenes and oligo(phenylene-vinylene)s (OPVs) with tert-butyl- and acetyl-protected thiol termini have been developed. These reactions proceed via Br/Li exchange, McMurry, and Wittig-type reactions. The thiol functionality is protected against strong basic and acidic reaction conditions as a t-Bu sulfide. As a key point in the method, reprotection of the thiol group is accomplished by means of acetyl chloride and boron tribromide. The novel strategy forms the basis for stepwise introduction of 4-mercaptostyryl units in OPVs. The new mono-, di-, and trimercapto OPVs have potential applications as one, two, and three terminal molecular devices in gold nanoparticle clusters, self-assembled monolayers, and optoelectronic devices.
Synthesis, UV/vis spectra and electrochemical characterisation of arylthio and styryl substituted ferrocenes
作者:Thomas Sørensen、Merete Nielsen
DOI:10.2478/s11532-011-0040-8
日期:2011.8.1
AbstractTwo series of substitutedferrocenes were synthesised using either the Horner-Wadsworth-Emmons reaction or monolithiation of ferrocene. The series consist of arylthio- and styryl-ferrocenes with different substituents in the para position of the aryl rings of the systems. The electronic communication was investigated by comparing the substituent effects in absorption spectroscopy and in cyclic
The synthesis of π-electron molecular rods with a thiophene or thieno[3,2-b]thiophene core unit and sulfur alligator clips
作者:Arnošt Seidler、Jiří Svoboda、Václav Dekoj、Jana Vacek Chocholoušová、Jaroslav Vacek、Irena G. Stará、Ivo Starý
DOI:10.1016/j.tetlet.2013.03.084
日期:2013.5
A series of short oligo(p-phenylene-ethynylene)- and oligo(p-phenylenevinylene)-type molecular rods with an electronically rich thiophene or thieno[3,2-b]thiophene core unit and sulfur anchoring groups (AcS-, t-BuS-) at the termini have been synthesised using Sonogashira coupling or Homer-Wads-worth-Emmons (E)-olefination methodology. The collection of linear/bent, conjugated/cross-conjugated systems has been characterised by UV-vis and fluorescence spectroscopy, optical/calculated HOMO-LUMO gaps and calculated excitation energies. (C) 2013 Elsevier Ltd. All rights reserved.