... (1963). Page 4. 264 Notes Vol. 6 ... (11) E. Knoevenagel and W. Ruschaupt, Ber., 31,1025 (1898). (12) The relative integrated intensities of the NH signals were (13) R. W. Lamon, J. Heterocyclic Chem., 5, 837 (1968). low with respect to those of hydrogen on carbon. ...