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Negative charge stability

Figure 16.18 Nucleophilic aromatic substitution on nitrochlorobenzenes. Only in the ortho and para intermediates is the negative charge stabilized by a resonance interaction with the nitro group, so only the ortho and para isomers undergo reaction. Figure 16.18 Nucleophilic aromatic substitution on nitrochlorobenzenes. Only in the ortho and para intermediates is the negative charge stabilized by a resonance interaction with the nitro group, so only the ortho and para isomers undergo reaction.
A is correct. The carbonyl group withdraws negative charge, stabilizing the conjugate base of pyruvate,... [Pg.135]

Delocalization of the negative charge stabilizes the conjugate base... [Pg.191]

Wittig Alkenation Reactions. The tosyhnethylene phosphorane is classified as a stabilized Wittig reagent because of the extra negative charge stabilization by the sulfone substituent on the yUdic carbon. Other stabilized ylides include (methoxy-or ethoxycarbonylmethylene)triphenylphosphorane, cyano-... [Pg.553]

A qualitative comparison of acidity requires a comparison of the stabiUty of negative charges. The following discussion will develop a methodical approach for comparing negative charge stability. Specifically, there are four factors to consider (1) which atom is the charge on, (2) resonance, (3) induction, and (4) orbitals. [Pg.108]

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See also in sourсe #XX -- [ Pg.108 , Pg.108 , Pg.109 , Pg.109 , Pg.110 , Pg.111 , Pg.112 , Pg.113 , Pg.114 , Pg.115 , Pg.116 , Pg.117 , Pg.118 ]



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