1. Sur quelques dérivés azotés de l'acide oxalique
2. Yields for1, 3, 4and 5 are the optima achieved after several trial experiments; that for 6 is from one experiment
3. Displacement Reactions on 1-Azulylmethyltrimethylammonium Iodide1,2
4. Concentration of the combined benzene fractions gaveca. 1 g of yellow semi-solid which was not investigated
5. Chromatography of the residue from the CH2Cl2extracts over basic alumina indicated the presence of an uncharacterized green material plus smaller amounts of azulene and 6, but a good separation was not obtained