Abstract
Friedel-Crafts type nitration of aromatics with nitryl halides, dinitrogen tetroxide, dinitrogen pentoxide and stable nitronium salts was investigated in homogeneous tetramethylene sulfone solutions. A simple new method of preparing nitronium tetrafluoroborate from nitric acid HF and BF2 was found. The scope of preparative nitroniu in fluoroborate nitration was extended to a variety of substituted aromatics.
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