A Partial List of Common Fragments.

This list should be adequate for the solution of all examples. A more complete list of common fragments can be obtained from the references listed below. You may find it useful to print out this table for use in the interpretation units.

14 CH₂
15 CH₃
16 O
17 OH
18 H₂O, NH₄
19 F
26 CN, C₂H₂
27 C₂H₃
28 C₂H₄, CO
29 C₂H₅, CHO
30 CH₂NH₂
31 CH₂OH
32 O₂
33 SH
34 H₂S
35 Cl
36 HCl
39 C₃H₃
41 C₃H₅
42 C₃H₆, C₂H₂O
43 C₃H₇, CH₃C=O
44 CH₂CHO
45 CH₃CHOH, CH₂CH₂OH, CH₂OCH₂
46 NO₂
47 CH₂SH
48 CH₃S + H
49 CH₂Cl
51 CHF₂, C₃H₃
53 C₄H₅
54 CH₂CH₂CN
55 C₄H₇
56 C₄H₈
57 C₄H₉, C₂H₅C=O
58 CH₃C(=O)CH₂ + H, C₂H₅CHNH₂
59 C₃H₆OH, CH₂OC₂H₅
60 CH₂COOH
61 CH₃COO
65 C₅H₅
66 C₅H₆
67 C₅H₇
68 CH₂CH₂CH₂CN
69 C₅H₉, CF₃
70 C₅H₁₀
71 C₅H₁₁, C₃H₇C=O
76 C₆H₄
77 C₆H₅
78 C₆H₅ + H
79 C₆H₅ + 2H, Br

References

Hamming, M and N. Foster. Interpretation of Mass Spectra of Organic Compounds. New York, NY. Academic Press.

McLafferty, F. W. Interpretation of Mass Spectra. Mill Valley, CA. University Scientific Books.

Silverstein, R, G. Bassler and T. Morrill. Spectrometric Identification of Organic Compounds. New York, NY. John Wiley and Sons. Inc.