Synthesis of a Multidentate Ligand and its Metal Complexes for Catalytic Application
Date Issued
2008
Date
2008
Author(s)
Chen, Po-Yuan
Abstract
2,7 –Di(2-pyridyl)-1,8-naphthyridine (bpnp) is a multiple pyridinyl nitrogen donor, which is able to bind with metal ions in a chelating manner. Its metal complexes particularly the ruthenium and copper, have known for a while, but catalytic activity of the related species has not been disclosed. In this work, the Stille coupling reaction of 2-(tributylstannyl)pyridine with 2,7-dichloro-1,8-naphthyridine provided the desired bpnp ligand efficiently. Preparations of dipalladium [Pd2Cl(H2O)(bpnp)]Cl and diruthenium Ru2Cl6(bpnp) complexes were achieved. With the use of diruthenium complex as the pre-catalyst, reduction of acetophenone derivatives into their corresponding alcohols under hydrogen-transfer conditions was studied. Ru2Cl6(bpnp) can also be used as the catalyst to promote the N-alkylation reaction of amine with an alcohol. In this reaction, the alcohol was oxidized to form the corresponding aldehyde, which is subsequently reacted with an amine to form the corresponding imine. Further reduction of C=N bond by the ruthenium hydride species produced the secondary amine product.
Subjects
metal-metal bond
catalytic
Type
thesis
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