Question

How would you use a DEPT spectrum and a {¹H}¹³C spectrum to deduce how many quaternary carbon atoms you have?

Answer 1

DEPT nothing but Distortionless Enhancement by Polarization Transfer

there isthree types of spectra we can record

DEPT-135

CH3 carbons              signal will appear above called +ve

CH2 carbon              signal will appear below called -Ve

CH carbon              signal will appear above called +ve

Quarternary carbons   you will not observe

DEPT-90

CH3 carbons             you will not observe

CH2 carbon              you will not observe

CH carbon              signal will appear above called +ve

Quarternary carbons   you will not observe

that means it will be use ful for finding CH

DEPT-45

CH3 carbons             signal will appear above called +ve

CH2 carbon            signal will appear above called +ve

CH carbon              signal will appear above called +ve

Quarternary carbons   you will not observe

IN DEPT we can see the quertanery carbon

that means it will be use ful for finding CH