Dinitration of Aromatic Compounds
EXPERIMENTAL
2961
Typical Procedure
A mixture of Yb(OPf)3 (21 mg, 0.012 mmol), PfOH (6 mg, 0.012 mmol),
toluene (0.26 ml, 2.5 mmol), hexane (3 ml), perfluorodecalin (C10F18, cis-
and trans-mixture, 5 ml) and 95% HNO3 (0.22 ml) was stirred at 608C for
4 h. Then, the fluorous layer on the bottom was separated for the next
nitration. The reaction mixture (organic phase) was treated with the usual
workup. Conversion and composition were determined by GC or GC-MS
using an internal standard method.
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