C13 spectrograph chemical shift

hydrocarbon group range

between 20-40

hydrocarbon ranking

C > CH > CH2 > CH3

alpha carbon def

C being one position away from a functional group

alpha carbon groups

between 20-50

electroneg atom on hydrocarbon

between 50-100

Br-C

70-20

N-C

70-20

Cl-C

70-40

O-C

80-60

F-C

100-80

C-=C

less than 100

N-=C

greater than 100

sp2 C groups range

between 150-100

ranking of sp2 C

benzoic C > alkene C

electroneg atom on sp2 C funct groups

carboxylic, ester, amide, aldehyde, ketone

electroneg atom on sp2 C (first level)

between 170-190

aldehyde & ketone range (electroneg sp2 C)

190-210

for IR, resonance shifts chem signals

downfield (resonance)

for HNMR, resonance shifts chem signals

upfield (resonance)

for IR, ring strain shifts chem signals

upfield (ring strain)

for HNMR, ring strain shifts chem signals

downfield (ring strain)