Discussion
What does a DEPT-135 experiment show?
Answer: A
DEPT-135 sorts carbons by the number of attached protons: methine and methyl point up, methylene points down, and carbons with no attached proton do not appear at all. Comparing it with the ordinary decoupled spectrum identifies the quaternary carbons by difference, and a DEPT-90 showing only methines separates CH from CH3. This is the routine substitute for the older off-resonance decoupled spectrum, and it is the fastest way to convert a list of carbon shifts into a count of hydrogens on each carbon.
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