NOTES J. Org. Chem., Vol. 55, No. ii, 1970 3971 in Scheme I, but the observed nmr spectrum of two sharp singleh seemed inconsistent with this structure, which apparently requires three lines. However, if 4 were shown to be ionizing rapidly and reversibly to structure 5 the nmr spectrum could be rationalized. Low temperature nmr in chloroform showed substantial broadening of the peak at r 8.22 consistent with the ionization ...
