2.2 13 C NMR Spectroscopy
11
13 C Chemical Shifts of Carbonyl Groups (δ in ppm)
R
R–CHO
R–COCH 3
R–COOH
R–COO –
–H
197.0
200.5
166.3
171.3
–CH 3
200.5
206.7
178.1
182.6
–CH 2 CH 3
202.7
207.6
181.5
185.1
–CH(CH 3 ) 2
204.6
211.8
184.1
181.8
–C(CH 3 ) 3
205.6
213.5
185.9
188.6
–n-C 8 H 17
202.8
208.9
180.7
184.7
–CH 2 Cl
194.0
200.1
173.7
175.9
–CHCl 2
184.3
193.6
170.4
171.8
–CCl 3
176.9
186.3
167.1
167.6
–cyclohexyl
204.7
209.4
182.1
185.4
–CH=CH 2
194.4
197.5
172.0
174.5
–C– – – CH
176.8
183.6
156.5
–phenyl
192.0
196.9
172.6
177.6
R
R–COOCH 3
R–CONH 2
R–COOCO-R R–COCl
–H
161.6
167.6
158.5
–CH 3
171.3
173.4
166.6
170.4
–CH 2 CH 3
173.3
177.2
170.9
174.7
–CH(CH 3 ) 2
177.4
180.2
172.8
178.0
–C(CH 3 ) 3
178.8
180.9
173.9
180.3
–n-C 8 H 17
174.2
176.3
169.4
173.7
–CH 2 Cl
167.8
168.3
162.1
167.7
–CHCl 2
165.1
166.6
157.6
165.5
–CCl 3
162.5
162.8
154.0
163.3
–cyclohexyl
175.3
177.3
176.3
–CH=CH 2
166.5
168.3
165.6
–C– – – CH
153.4
154.9
–phenyl
166.8
169.7
162.4
168.0