@article{Martin1998Cyclo-23885,
  year={1998},
  doi={10.1016/S0020-1693(98)00065-6},
  title={Cyclomagnesation of dienes catalyzed by a chiral ansa-zirconocene},
  number={1-2},
  volume={280},
  issn={0020-1693},
  journal={Inorganica Chimica Acta},
  pages={189--192},
  author={Martín, Sandra and Brintzinger, Hans-Herbert}
}

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    <dcterms:title>Cyclomagnesation of dienes catalyzed by a chiral ansa-zirconocene</dcterms:title>
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    <dcterms:bibliographicCitation>Inorganica Chimica Acta ; 280 (1998), 1-2. - S. 189-192</dcterms:bibliographicCitation>
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    <dc:creator>Brintzinger, Hans-Herbert</dc:creator>
    <dc:contributor>Martín, Sandra</dc:contributor>
    <dcterms:issued>1998</dcterms:issued>
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    <dc:language>eng</dc:language>
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    <dcterms:abstract xml:lang="eng">The biphenyl-bridged, chiral zirconocene complex rac-2,2'-biphenyl-bis(3,4-dimethylcyclopentadienyl)zirconium dichloride catalyzes the reaction of 1,6- and 1,7-dienes with excess dibutyl magnesium to bis(butyl-magnesio-methyl)-substituted cycloalkane derivatives. Analogous reactions occur with butyl magnesium chloride and with heteroatom-containing dienes. The preference of 1,6-dienes for trans-fused cyclization products and that of 1,7-dienes for cis-fusion at ambient and for trans-fusion at elevated temperatures is similar to that observed before for unsubstituted zirconocene complexes. The R-enantiomer of the biphenyl-bridged zirconocene complex gives trans-fused cyclization products with an optical purity of only 15 ± 1% ee. The stereochemistry of these cyclomagnesation reactions is explained in terms of the relative rates of mutually competing cyclization and transmetalation steps.</dcterms:abstract>
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