1. The insertion and extrusion of heterosulfur bridges.XIII.Syntheses and structural studies of nitrophenanthro[4,5-bcd]thiophenes
2. Apparently 1 is considerably less reactive than 2. In any event 1 or its acetylation product(s) was not encountered during processing of reaction mixtures. However, see footnote [14].
3. Phenanthrene Derivatives. V. The Beckmann Rearrangement of the Oximes of Acetylphenanthrenes and Benzoylphenanthrenes
4. The oximation procedure is presented by R. L.Shriner, R. C.Fuson, and D. Y.Curtin, The Systematic Identification of Organic Compounds, 5th Ed, John Wiley and Sons, Inc., New York, NY 1967, p 289. Oximation and Beckmann rearrangement steps for the conversion of 2-acetylthieno[2,3- b]pyridine into 2-acetylaminothieno[2,3- b]pyridine were also reported from our laboratory