Ring opening reactions O 0132Synthesis of Several Unexpected Compounds from 2,2,4,4,6-Pentachloro-5-cyclohexene-1,3-dione (A Humic Acid Model), Monochloramine, Ammonia and Other Reagents. -The reaction of title compound (I), a humic acid model, with several chemicals related to drinking water chlorination, for example ammonia, chloramine and NaOCl leads to the formation of unusual novel chlorinated organic products, e.g. (II), (III) and (IV), respectively. The syntheses and confirmation of structures are discussed in detail. -(HEASLEY*, V. L.; RAMIREZ, A. M.; BAKER, P. E.; BOERNEKE, J. L.; DEBOARD, R. H.; HARTGE, T. L.; MADRID, D. C.; SIGMUND, G. A.; SHELLHAMER, D. F.; Lett. Org. Chem. 4 (2007) 7, 500-504; Dep. Chem., Point Loma Nazarene Coll., San Diego, CA 92106, USA; Eng.) -M. Paetzel 09-040