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

✍ Scribed by E.Peter Kündig; Anna Quattropani

Book ID: 104214441
Publisher: Elsevier Science
Year: 1994
Tongue: French
Weight: 345 KB
Volume: 35
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)73219-9

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✦ Synopsis

Sequential reaction of pmchiral (r$arene)Cr(CO)~ complexes with chiral amide bases and electrophiles yielded planar chiml complexes. Benzaldehyde acetal and phenyl carbamate complexes gave o-substituted products with 64 to 81% enautiomeric excess. With the bemaldehyde acetal complex. competitive benzylic depmtonation occured. Bnantiometic purity of the substituted car&mate complexes could he increased to >90% ee by fractional crystallization. The racemate crystallized selectively, leaving the enantiomerically enriched complex in solution.

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