Question

How many signals should be observed in the `""^13C{""^1H}` `"NMR spectrum"` of `"ethyl acetate"`?

Answer 1

Of `"ethyl acetate...............?"`

Explanation:

For `"H"_3"CCH"_2"O(O=)CCH"_3` there should be 4 singlets in the `""^13"C"{""^1"H"}` `"NMR"` spectrum, and four only. It might be hard to see the carbonyl carbon, but this will occur well downfield (and in the spectrum pictured, the carbonyl carbon is quite distinguishable; of course with reagents like this, which are available in quantity, you make a solution of almost 100% sample with a drop or 2 of lock solvent).

In the `"DEPT-135 sequence"`, the `"methylene carbon"` of the ethyl residue should be negative.

Why does the `d_1-"chloroform"` signal appear as a triplet?