1958 Volume 6 Issue 2 Pages 203-208
The structures of dialkylpseudoskyrin and its related compounds were discussed and it was shown that all the evidences provided agreed quite sufficiently with the structure proposed in the previous paper. The mechanism of the coloration of skyrin with conc. sulfuric acid was also discussed using some model compounds (tetraacetylbirubiadin-(4, 4'), etc.).