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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2009, 9800 - 9806, DOI: 10.1039/b905394h

Synthesis and catalytic application of aluminium anilido-pyrazolate complexes

Kuo-Fu Peng and Chi-Tien Chen

A series of aluminium complexes containing anilido-pyrazolate ligands is described. Reactions of four anilido-pyrazolate ligand precursors, HNPhPz, HNPhTriMePz, HNPhOMePz, or HNPhSMePz [HNPhPz = ortho-C6H4(NH-phenyl)(1-pyrazole); HNPhTriMePz = ortho-C6H4(NH-2,4,6-trimethylphenyl)(1-pyrazole); HNPhOMePz = ortho-C6H4(NH-2-methoxyphenyl)(1-pyrazole); HNPhSMePz = ortho-C6H4(NH-2-methylthiophenyl)(1-pyrazole)], with one molar equivalent of AlMe3 in toluene give the aluminium dimethyl complexes, (NArPz)AlMe2 [Ar = phenyl, (NPhPz)AlMe2 ( 1); Ar = 2,4,6-trimethylphenyl, (NPhTriMePz)AlMe2 ( 2); Ar = 2-methoxyphenyl, (NPhOMePz)AlMe2 ( 3); Ar = 2-methylthiophenyl, (NPhSMePz)AlMe2 ( 4)], respectively. The molecular structures are reported for compounds 1 and 3. Their catalytic activities toward the ring opening polymerisation reaction of -caprolactone in the presence of BnOH are also under investigation.

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