Two novelazulene chromophores 1 and 2 were synthesized to study dynamics of ultrafast electron injection at the interface of TiO2 semiconductor nanoparticles. Fluorescence quenching was observed upon binding.
Simple and productive routes to mono-, di- and triethynylazulenes are described. Azulenes ethynylated in the five-membered ring can be prepared on a multigram scale by Pd-catalyzed cross-coupling of iodo- or bromoazulenes with trimethylsilyl-acetylene and subsequent desilylation. 5,7-Diethynylazulene was synthesized by dibromomethylenation of the corresponding dialdehyde and subsequent dehydrobromination
Cyclooligomerization of Mono- and Diazulenylethynes Catalyzed by Transition Metal Complexes
作者:Ahmed H. M. Elwahy、Klaus Hafner
DOI:10.1002/ejoc.200900946
日期:2010.1
Cyclooligomerization of 1-ethynylazulenes 1a,b, 6 and 7 as well as 1,2-bis(azulen-1-yl)ethynes 10a,b and 11 with CpCo(CO) 2 to the corresponding 1,2,4-tris(azulen-1-yl)benzenes 14a,b, 18 and 19 as well as [bis- and tetrakis(azulen-1-yl)cyclobutadiene]cobalt complexes 17a,b, 30a,b and 31 is described.
Metal mediated cyclooligomerization of mono- and diazulenylethynes
作者:Ahmed H.M Elwahy、Klaus Hafner
DOI:10.1016/s0040-4039(00)00309-9
日期:2000.4
A synthesis of 1,2,4-triazulen-1-ylbenzenes 4a, b as well as di- and tetraazulenylcyclobutadiene cobalt complexes 9a, b and 11a, b by cyclooligomerization of 1-ethynylazulenes 1a, b and 1,2-diazulenylethynes 2a, b are described.
A synthesis of dumbbell-shaped alkynyl-bridged diazulenyl compounds 8, 9 as well as the triazulenylbenzene derivative 12 starting from 1-ethynyl-3-(2,3,4,5-tetraphenylphenyl)azulene (5) is described. (C) 2002 Published by Elsevier Science Ltd.