Mass Spectral Studies of Unsymmetrical Dialkyl Disulfides. Intramolecular 1, 2-, 1, 3-, and l, 4-Hydrogen Migration Processes 1, 2-, 1, 3-, and 1, 4-Hydrogen Migration Processes J. Org. Chem., Vol. 43, No. 23, 1978 4491 white solid which remained was extracted with ligroin (2 X 5 mL), and the combined extracts were concentrated to 3 mL and then cooled in a refrigerator overnight,. After this period, the white needles of 24 which separated were ...