Planar chiral arene tricarbonylchromium complexes via enantioselective deprotonation / electrophile addition reactions

  • Kündig E
  • Quattropani A
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Sequential reaction of prochiral (η6-arene)Cr(CO)3 complexes with chiral amide bases and electrophiles yielded planar chiral complexes. Benzaldehyde acetal and phenyl carbamate complexes gave o-substituted products with 64 to 81% enantiomeric excess. With the benzaldehyde acetal complex, competitive benzylic deprotonation occurred. Enantiomeric purity of the substituted carbamate complexes could be increased to > 90% ee by fractional crystallization. The racemate crystallized selectively, leaving the enantiomerically enriched complex in solution. © 1994.

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  • E. Peter Kündig

  • Anna Quattropani

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