| abstract |
8. A compound of the formula: WHEREIN EACH R is selected from the class consisting of fluorine and fluoroalkyl radicals and wherein R groups taken together can form ring systems, which compound comprises a ring which contains a plurality of hetero atoms therein, said ring containing only a single azomethine group, provided that said compound contains no atoms other than carbon, fluorine, nitrogen, oxygen and sulfur atoms. 10. Perfluoro-5,6-dihydro-2H-1,4-oxazine. 12. 1,1,1,1-TETRAFLUOROPERFLUORO-5,6-DIHYDRO-2H-1,4-thiazine. |