ir, hnmr, cnmr values

OH stretch IR

3500-3200

NH stretch IR

3400-3100

CH alkyne stretch IR

3300-3150

CH alkene stretch IR

3100-3000

CH alkane stretch IR

3000-2850

C triple bond C/ C triple bond N stretch IR

2300-2150

C double bond O IR

1760-1665

C double bond C IR

1680-1640

R-CH3 methyl H NMR

0.9

R-CH2-R H NMR

1.3

R3C-H methine H NMR

1.5-2

=-CH3 (C is next to a pi bond) (allylic) H NMR

1.8-2

carbonyl C=O H NMR

2-2.3

Ar-CH3 benzylic (C is next to Ph) H NMR

2.3-2.6

RC triple bond CH alkynyl H NMR

2.5

R2N-CH3 (C attached to N) H NMR

2-3

R-CH2-X (halogen) H NMR

2-4

RO-CH3 (C attached to O) H NMR

3.5-4.5

R-CH2-F (C attached to F) H NMR

4-5

R2C=CR (vinylic H is attached to alkene C) H NMR

4.5-5.5

Ar-H aromatic H NMR

6-8

R-C=O-H aldehyde H NMR

8-10

ROH alcohol H NMR

0.5-5

Ar OH phenol H NMR

4-7

carboxylic acid H NMR

10-13

RNH2 amine H NMR

0.5-5

ArNH2 H NMR

3-5

R-C=O-NHR amide H NMR

5-9

R-CH3 methyl C NMR

10-30

R-CH2-R C NMR

15-55

R3C-H CNMR

20-60

C-I CNMR

0-40

C-Br CNMR

25-55

C-N CNMR

40-60

C-Cl CNMR

40-70

C-O CNMR

50-90

C triple bond C CNMR

65-90

R2C=CR2 alkene CNMR

100-150

aromatic ring CNMR

110-165

carboxylic acid, ester, amide, C=O CNMR

165-185

ketone/aldehyde CNMR

185-220

in mass spectroscopy, the fragmentation of a carbonyl‐containing radical cation to produce an enol radical cation and a neutral alkene is called

mclafferty rearrangment

What does the number of signals tell you

number of unique environments

What does the chemical shift tell you

what type of environment H is in

What does integration tell you

base ratio of how many H contribute to each peak

What does multiplicity tell you

the number of neighboring H

What are some deuterated solvents used NMR spectropscopy

d chloroform, d benzene, d water

he absorption of ______ waves can flip spins if the energy of the radio wave matches the difference between the energies of the spin up and spin down

radio

the difference between the energies of spin up and spin down is proportional to the strength of the applied _________

magnetic field