Aromatic and Heteroaromatic Chemistry
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J. G. Lombardino, J. Org. Chem., 1971, 36, 1843. ** T. I. Jacobs in “Heterocyclic
Compounds', ed. R. C. Elderfield, J. Wiley and Sons, New York, 1957, vol. 5, p.
57. ** E. S. Schipper and A. R. Day in “Heterocyclic Compounds', ed.