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Nuclear magnetic resonance Lewis acid complexes

Kobayashi et al. also reported interesting chemoselectivity of aldehydes and imines in the Yb(OTf)3-catalyzed addition reactions of silyl enol ether, allylstannane or trimethylsilyl cyanide [12]. In the competitive reactions between aldehydes and imines, the imines reacted faster than the aldehydes (Tables 4-6). This tendency is not unique to Yb as catalyst selectivity is similar for other Ln(OTf)3. Nuclear magnetic resonance (NMR) studies revealed selective formation of an imine-Yb(OTf)3 complex in the presence of an aldehyde. This preference was reversed when conventional Lewis acids (SnCE, TiCU, TMSOTf, and BF3 OEt2) were used. [Pg.916]

See other pages where Nuclear magnetic resonance Lewis acid complexes is mentioned: [Pg.437]    [Pg.92]    [Pg.20]    [Pg.254]    [Pg.781]    [Pg.673]    [Pg.149]    [Pg.71]    [Pg.71]    [Pg.133]    [Pg.92]    [Pg.17]    [Pg.313]    [Pg.347]    [Pg.4]    [Pg.274]    [Pg.145]   
See also in sourсe #XX -- [ Pg.292 ]

See also in sourсe #XX -- [ Pg.292 ]

See also in sourсe #XX -- [ Pg.292 ]

See also in sourсe #XX -- [ Pg.292 ]

See also in sourсe #XX -- [ Pg.292 ]



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Acids nuclear magnetic resonance

Complex resonance

Lewis acid complexation

Lewis acid complexes

Lewis complexed

Magnetic Acid

Magnetic complex

Nuclear acids

Nuclear complexes

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