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P-silyl effect

Summary 1-Ary 1-2-trialkyIsilyl-substituted vinyl cations are characterized in solution by NMR spectroscopy. The NMR chemical shift data reveal the stabilization of the positive charge by a (5-silyl substituent. The order of hyperconjugative stabilization of a positive charge by P-substituents is H < alkyl < silyl. The P-silyl effect is dependent on the electron demand of the carbocation and decreases with better electron donating a-substituents. NMR spectroscopy is a suitable tool to investigate the competition between 7i-resonance and CT-hyperconjugation in these type of carbocations. [Pg.361]

Keywords p-silyl effect, computational chemistry, hyperconjugation, NMR, X-ray structure... [Pg.80]

See other pages where P-silyl effect is mentioned: [Pg.20]    [Pg.28]    [Pg.30]    [Pg.41]    [Pg.15]    [Pg.17]    [Pg.21]    [Pg.28]    [Pg.361]    [Pg.364]    [Pg.26]    [Pg.383]    [Pg.95]    [Pg.254]    [Pg.81]    [Pg.474]   
See also in sourсe #XX -- [ Pg.80 ]



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