Phospha-S-Triazines. X. Thiophenyl-Substituted Phospha-S-Triazines

摘要

A series of thiophenyl-substituted mono- and diphosphas-triazines was prepared. These materials exhibited physical characteristics similar to those of the corresponding phenyl analogues, but the mass spectral breakdown patterns were dominated by the loss of the thiophenyl group and differed significantly from that of the other phospha-s-triazines investigated to date. The thiophenyl-phospha-s-triazines exhibited anticorrosive and antioxidative action when used as additives in perfluoroalkylether fluids. At elevated temperatures, 316 C, these materials were less effective than the phenyl analogues. The monophospha-members of the series were thermally and oxidatively less stable than the corresponding diphospha-s-triazines: 67 versus 96% starting material recovery after exposure to air at 235 C for 24 hr. Both the mono- and diphospha-s-triazines were completely degraded in 24 hr at 316 C in nitrogen. Past investigations have shown phospha-s-triazines, as well as the diphosphatetraazacyclooctatetraenes to exhibit anticorrosion and antioxidative action when used in perfluoroalkylether fluids in the presence of metals or metal alloys. This particular phase of the research was directed at synthesis and evaluation of thiophenyl-substituted phospha-s-triazines with the ultimate aim to develop materials which would act as oxidation and corrosion inhibitors in addition to serving as lubricity additives.