Abstract
The reaction of the N-trimethylsilyl-substituted heterocycles, trimethylsilyl- pyrazole. 1,-imidazole, 3,-5,6-dimethylbenzimidazole, 7, and 1,3,4-triazole, 8 with phosphorus pentafluoride was studied. The reaction proceeded via the initial formation of 1:1 Lewis acid-base adducts between phosphorus pentafluoride and the nitrogen atom bearing the Me 3Si group. In the reaction of 1 with PF 5 the unusual bis-tetrafluorophosphate complex. 2 was directly formed by cleavage of Si-N bonds and elimination of Me 3SiF. The reaction of the trimethylsilylated triazole. 8 with PF 5 produced a mixture of substances. The dimer 5 was formed during thermolysis of 4. The products were characterized by 1H, 13C, 19F, and 31p n.m.r spectroscopy. A single crystal X-ray structure determination was conducted for the pyrazole- bridged bis-tetrafluorophosphate complex. 2, in which the central six- membered ring (P 2N 4) adopts a boat conformation.
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