Benniston, Andrew C.; Grosshenny, Vincent; Harriman, Anthony, Angewandte Chemie, 1994, vol. 106, p. 1956 - 1958
作者:Benniston, Andrew C.、Grosshenny, Vincent、Harriman, Anthony、Ziessel, Raymond
DOI:——
日期:——
Construction of Preorganized Polytopic Ligands via Palladium-Promoted Cross-Coupling Reactions
作者:Vincent Grosshenny、Francisco M. Romero、Raymond Ziessel
DOI:10.1021/jo962068w
日期:1997.3.1
Rigid preorganized multitopic ligands have been designed and synthesized. The Pd(O)-catalyzed cross-coupling reactions between ethynylated derivatives of bipyridine or terpyridine and the corresponding bipyridine or terpyridine halides or triflates provide access to various homo-ditopic, hetero-ditopic, homo-tritopic, and hetero-tritopic ligands bearing acetylene or diphenylacetylene central units in fair to excellent yields. Optimal conditions mere found with [Pd(PPh(3))(2)Cl-2], CuI in THF and diisopropylamine at rt, or with [Pd(PPh(3))(4)] in benzene and diisopropylamine at 80 degrees C. When a phenylethynyl group is present in the molecule, the relevant conditions involve [Pd(PPh(3))(4)] in n-propylamine at 60 degrees C. Oxidative dimerization of the ethynylated derivatives in the presence of cupric salts and oxygen gives the corresponding homo-ditopic ligands bearing diacetylene or diphenyldiacetylene as a spacer in good yields. These methods provide a practical approach to the rational design of multichelating ligands for coordination of redox and photoactive transition metals.
Novel ditopic terpyridine and phenylterpyridine ligands bridged by one or two ethynyl bonds: syntheses of rigid rod-like multinuclear complexes
作者:Vincent Grosshenny、Raymond Ziessel
DOI:10.1016/0022-328x(93)83132-f
日期:1993.7
A novel series of ditopic ligands bearing two 2,2′:6′,2″-terpyridine or two 4′-phenyl-2,2′:6′,2″-terpyridine subunits and an ethynyl (3a and 3b) or a diethynyl (4a and 4b) bridge has been synthesised from 4′-ethynyl-2,2′ : 6′,2″-terpyridine (1d) and 4′-(4-ethynylphenyl)-2,2′:6′,2″-terpyridine (2c) by coupling with the corresponding triflate- or bromo-substituted substrates, or by self-coupling of the