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Volumn 126, Issue 41, 2004, Pages 13174-13175

Direct generation of Ti-enolate of α-CF3 ketone: Theoretical study and high-yielding and diastereoselective aldol reaction

Author keywords

[No Author keywords available]

Indexed keywords

FLUOROCARBON; KETONE; LITHIUM; TITANIUM DERIVATIVE; TITANIUM TETRACHLORIDE;

EID: 6044260122     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja046518a     Document Type: Article
Times cited : (70)

References (41)
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    • note
    • 3N (formed as a byproduct of enolate formation).
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    • note
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    • note
    • All calculations were performed using the Gaussian 98 and 03 program packages.
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    • note
    • Although optimization was set to start from the hexagon structure (close to Li-enolate), the stationary point of the Ti-O-C bond was straight.
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    • note
    • Orbital interaction could be observed by molecular orbital analysis. See Supporting Information.
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    • note
    • X-ray structure of the product with benzaldehyde was obtained. CCDC 240382 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via the Internet at www.ccd-c.cam.ac.uk/ data_request/cif, by emailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.
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    • note
    • 3-enolate of 1,1,1-trifluoro-4,4- dimethyl-pentan-3-one and benzaldehyde was adopted for the calculation model.
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    • note
    • In sharp contrast, in the case with fluoral, the anti diastereoselectivity did not change (anti:syn = 62:38) even in the presence of HMPA. This could be the evidence for the dipole interaction-controlled diastereoselectivity in the case of fluoral. See ref 13.


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