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18 Nov 2019
3) Complete the table shown below in your laboratory notebook describing the NBO (NPA) charges for each of the ring C-atoms. Explain why specific carbon atoms in the benzene es have significantly different electron density than the carbon atoms of benzene itself. Include key resonance structures for each derivative in your answer, (5 points) X = H, benzene X = NMe2, N,N-dimethylaniline X=F, fluorobenzene X = CN, benzonitrile is underlirta. Thank-ou benzene fluorobenzene benzonitrile dimethylaniline H-atom H-atom H-atom NMR Charge shift H-atom NMR Charge shift NMR NMR Charge shift Charge shift ppm) ppm) (ppm) (ppm) Cipso0.235 7.33 .175 Corthol-0.235 7.33 |-o,29 ! 6.71 |-o,aoH 7. 10-0, 226 7.65&-0.2 Cmeta0.235 7.33o 7.22. 7.29.230 7.41o.23 para-0.235 7.33 215 6.7-0.254 7.03 O.419 0.05
3) Complete the table shown below in your laboratory notebook describing the NBO (NPA) charges for each of the ring C-atoms. Explain why specific carbon atoms in the benzene es have significantly different electron density than the carbon atoms of benzene itself. Include key resonance structures for each derivative in your answer, (5 points) X = H, benzene X = NMe2, N,N-dimethylaniline X=F, fluorobenzene X = CN, benzonitrile is underlirta. Thank-ou benzene fluorobenzene benzonitrile dimethylaniline H-atom H-atom H-atom NMR Charge shift H-atom NMR Charge shift NMR NMR Charge shift Charge shift ppm) ppm) (ppm) (ppm) Cipso0.235 7.33 .175 Corthol-0.235 7.33 |-o,29 ! 6.71 |-o,aoH 7. 10-0, 226 7.65&-0.2 Cmeta0.235 7.33o 7.22. 7.29.230 7.41o.23 para-0.235 7.33 215 6.7-0.254 7.03 O.419 0.05
Elin HesselLv2
13 Jul 2019