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Snapshots of titanium BINOLate complexes with diverse solid state structures.

T J Davis1, J Balsells, P J Carroll

  • 1Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA.

Organic Letters
|March 22, 2001
PubMed
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Researchers have determined the structures of BINOLate titanium complexes, revealing aggregation patterns. These findings offer insights into intermediates for asymmetric alkylation reactions.

Area of Science:

  • Organometallic Chemistry
  • Asymmetric Catalysis

Background:

  • Asymmetric reactions are crucial in synthesizing chiral molecules.
  • Titanium-BINOLate complexes are effective catalysts, but their structures remain elusive.
  • Understanding catalyst structure is key to optimizing asymmetric synthesis.

Purpose of the Study:

  • To elucidate the structures of BINOLate titanium complexes.
  • To investigate the aggregation behavior of these complexes.
  • To identify potential intermediates in asymmetric alkylation reactions.

Main Methods:

  • Synthesis and structural characterization of BINOLate titanium complexes.
  • X-ray crystallography to determine molecular structures.
  • Analysis of aggregation in solution and solid states.

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Main Results:

  • Three distinct BINOLate titanium complex structures were determined.
  • Observed aggregation of (BINOLate)Ti(OiPr)2 with itself and titanium tetraisopropoxide.
  • Structures suggest these complexes act as intermediates in asymmetric alkylations.

Conclusions:

  • The determined structures provide a molecular basis for the catalytic activity of BINOLate titanium species.
  • Understanding aggregation is vital for designing improved asymmetric catalysts.
  • These findings advance the field of asymmetric catalysis using titanium complexes.