Differentiate between PMR and 13 CNMR
Q.3. (b) How will you simplify complicated splitting pattern in PMR? Differentiate between PMR and 13 CNMR.
Ans.3. (b)Introduction:
The complete analysis of a compound is frequently made difficult, when signals overlap and as a result, useful information is often buried due to complexity of the spectrum. In a spectrum several signals may overlap as is the case, e.g., of closely related methylene groups in a molecule. In such a situation an intense, broad and compulsory unresolved signal, termed the methylene envelope may appears between δ 1-2. Another cause of complexity is where a coupling constant is comparable with the chemical shift different between the coupled protons. For these problems following techniques may use to solve them.