What are some general rules about interpreting a mass spectrum?
Unfortunately, the mass spectral interpretation section in McMurry is rather meager, and the topic is not covered in Williamson. Therefore, study the steps given below and you should be able to successfully interpret your mass spectrum. First, locate the molecular ion in the spectra and mark it with an M+ or better, M. You normally know what M+ should be because you just synthesized the material or you have some other clue as to its identity. One immutable rule about molecular weights of organic compounds is that they are always even except in the case of nitrogen-containing compounds. In this case, if the molecule contains an odd number of nitrogens, it will have an odd molecular weight; if even, an even molecular weight. All mass spectra shown below have even M+s because they don’t contain N, except for Mass Spectrum # 8, which is an amine and contains 1 (an odd number) nitrogen. and therefore has an odd M+.
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