NMR, and IR combined make quick identification possible

Mass spectra, NMR, and IR combined make quick identification possible [Pg.72]

If these methods are each as powerful as we have seen on their own, how much more effective they must be together. We shall finish this chapter with the identification of some simple unknown [Pg.72]

The 13C NMR spectrum has only three peaks so two carbon atoms must be the same. There is one signal for saturated carbon next to oxygen, and two for other saturated carbons, one more downfield than the other. The IR spectrum reveals a broad peak for an OH group with two sharp NH2 peaks just protruding. If we put this together, we know we have C-OH and C-NH2. Neither of these carbons can be duplicated (as there is only one O and only one N ) so one of the remaining carbons must be duplicated. [Pg.73]

The next stage is one often overlooked. We don t seem to have much information, but try and put the two fragments together, knowing the molecular formula, and there s very little choice. The carbon chain (shown in red) could either be linear or branched and that s it [Pg.74]

By chain terminating we mean only attachable to one other [Pg.74]

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