Part A. One-Dimensional Techniques

Moreover, if a particular compound is going to be more than routinely examined, it is worth investing the time to measure its Tfs, because these values are especially helpful in determining the appropriate repetition times to be used in two-dimensional NMR experiments (Section 7-4g). Knowledge of CTj s also is desirable, but the time required to determine these values usually is deemed to be too long to make the information gained worthwhile. This statement is especially true today, since the relaxation delays of the most important 2D NMR experiments are dependent on H, rather than Tfs. 

After preliminary and NMR experiments have been performed in a nonroutine analysis, an important piece of information concerns sorting the carbons in terms of the number of directly bonded hydrogens (i.e., methyl, methylene, methine, and quaternary). This knowledge can be gained from both one- and two-dimensional experiments. The principal sources of such information, however, are the one-dimensional APT and DEPT experiments (Section 5-5). 

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