Towards molecular electronics: a new family of aromatic polyimine chelates substituted with alkyne groups
作者:Jean Suffert、Raymond Ziessel
DOI:10.1016/s0040-4039(00)74877-5
日期:1991.2
Bromo and chloro polyimines react with trimethylsilyacetylene in the presence of Pd(PPh3)2Cl2/CuI and diisopropylamine to give newsubstituted polyimines 1a to 8a. These compounds are deprotected with K2CO3 in MeOH / THF to produce the corresponding terminal alkynes 1b to 8b.
diynes provides access to ditopic bipyridine or terpyridine ligands oligoPy(C&tbd1;C)(4)oligoPy comprising a tetrayne spacer. Quantitative formation of air-stable copper(I) complexes is described for the 6,6'-substitutedligands. A single crystal X-ray structure of complex 22a shows that the two ligands are interlocked around the copper(I) center in a pseudotetrahedral arrangement, similar to the structure
Synthesis and properties of novel ditopic polypyridine ligands bridged by one and two acetylenic bonds
作者:Vincent Grosshenny、Raymond Ziessel
DOI:10.1016/s0040-4039(00)74721-6
日期:1992.12
bipyridine or terpyridine subunits, in the presence of catalytic amounts of Pdo(PPh3)4 to yield, the new homo- and heteroditopic ethynyl bridgeligands 2a, 4a, 7a and 8. Self coupling of the ethynyl substituted bipyridine species in the presence of CuCl/TMEDA/O2, yield the symmetric diethynyl bridgeligands 2b, 4b and 7b.
乙炔基取代的联吡啶螯合物与溴或三氟甲磺酸酯官能化联吡啶或三联吡啶亚基在催化量的Pd o(PPh 3)4存在下反应,生成新的均位和异位乙炔基桥配体2a,4a,7a和8。在CuCl / TMEDA / O 2存在下乙炔基取代联吡啶的自偶联产生对称的二乙炔基桥配体2b,4b和7b。
Preparation of novel mixed tritopic oligopyridine ligands built with chelating spacers and using palladium(0) catalysed coupling reactions
作者:Francisco M. Romero、Raymond Ziessel
DOI:10.1016/0040-4039(94)88466-8
日期:1994.12
The synthesis and characterization of tritopic ligands, obtained by connecting two terpyridines or two bipyridines with a bis-substituted-ethynyl-bipyridine or bis-substituted-ethynyl-phenanthroline spacer are described. Palladium(0) catalyses the coupling of the bis-ethynyl substituted central spacer with a bromo or a triflate functionalizedbipyridine or terpyridine subunit. A novel trinuclear ruthenium
A convenient synthetic route to polypyridine-esters by palladium-promoted carboalkoxylation
作者:Abdelkrim El-ghayoury、Raymond Ziessel
DOI:10.1016/s0040-4039(98)00820-x
日期:1998.6
smoothly with CO (1 atm) and n-butanol in the presence of a tertiary amine and a catalytic amount of bis(triphenylphosphine)palladiumdichloride to afford the corresponding esters. When ethanol and a disubstituted substrate are used under milder conditions, selective mono-carboalkoxylation occurs. Amidation is effected using a primaryamine as nucleophile.