Reaction of octakis(dimethylamino)tetraphosphonitrile with antimony trifluoride
Abstract
A series of 14 non-germinally substituted dimethylaminofluorotetraphosphonitriles, P4N4Fn(NMe2)8 –n where n= 1,2(four isomers), 3(three isomers), 4(three isomers), and 5(three isomers), has been prepared by the reaction of P4N4(NMe2)8 with antimony trifluoride. The tetra- and penta-fluorides are identical with those obtained from the fluorination of P4N4Cl4(NMe2)4 but five new compounds have been separated and assigned structures from g.l.c., 1H and 19F n.m.r. data. The reaction mechanism is thought to be similar to that discussed previously and involves co-ordination of antimony trifluoride to the most basic ring nitrogen atom rather than to an amine substituent. Fluorination follows a non-geminal path with a tendency to form larger amounts of trans- rather than cis-isomers.