1. For paper XLVIII see Powell, H., Williams, D.H., Budzikiewicz, H. and Djerassi, C., J. AM. CHEM. SOC., submitted for publication.
2. In publications from this laboratory, a fishhook () represents a one-electron shift, while a full arrow () Indicates a two-electron movement.
3. Interpretation of Mass Spectra of Organic Compounds;Budzikiewicz,1964
4. Mass Spectrometry in Structural and Stereochemical Problems. I. Steroid Ketones